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HomeMy WebLinkAboutAir PM Results November 2023Thursday, November 16, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location 24-Hour Particulate Matter Level Concern Period Ending (ug/m3) of Moffett and Tustin Ranch 11/16/23 8 am 66 Moderate Road SE Corner Valencia and 11/16/23 8 am 44 Good Armstrong SW Corner Valencia and 11/16/23 8 am 9 Good Legacy Valencia across from 11/16/23 8 am 11 Good Columbus Victory and Tustin Ranch 11/16/23 8 am 16 Good Road Village Green Park 11/16/23 8 am 16 Good Warner Avenue Light Post 11/16/23 8 am 24 Good 03534 Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health _4,pW,ts is increased for everyone Hazardous04 . of emergencyconditions: ever•ne is more likely to be affected. Friday, November 17, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location 24-Hour Particulate Matter Level Concern Period Ending (ug/m3) of Between Compass and 11/17/23 8 am 9 Good Armstrong End of Legacy 11/17/23 8 am 6 Good Moffett and Tustin Ranch 11/17/23 8 am 61 Moderate Road SE Corner Valencia and 11/17/23 8 am 26 Good Armstrong SW Corner Valencia and 11/17/23 8 am 9 Good Legacy Valencia across from 11/17/23 8 am 6 Good Columbus Victory and Tustin Ranch 11/17/23 8 am 2 Good Road Village Green Park 11/17/23 8 am 3 Good Warner Avenue Light Post 11/17/23 8 am 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e is is increased for everyone Hazardous04 . of emergencyconditions: ever•ne is more likely to be affected. Saturday, November 18, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) (155 to 254) See below for further category descriptions. 24-Hour Particulate Matter Level Concern PeriodLocation Ending of Between Compass and 11/18/23 8 am 28 Good Armstrong End of Legacy 11/18/23 8 am 23 Good Fire Station 21 11/18/23 8 am 31 Good Fire Station 28 11/18/23 8 am 31 Good Fire Station 6 11/18/23 8 am 32 Good Heritage Elementary 11/18/23 8 am 20 Good Hicks Canyon Elementary 11/18/23 8 am 53 Good Legacy Academy 11/18/23 8 am 20 Good Moffett and Tustin Ranch 11/18/23 8 am 77 Moderate Road OC Animal Shelter 11/18/23 8 am 20 Good OCFD Station 37 11/18/23 8 am 56 Moderate OCHCA 11/18/23 8 am 60 Moderate SE Corner Valencia and 11/18/23 8 am 19 Good Armstrong SW Corner Valencia and 11/18/23 8 am 24 Good Legacy The District Gas Station 11/18/23 8 am 8 Good Tustin High School 11/18/23 8 am 7 Good Tustin Legacy Park 11/18/23 8 am 8 Good Valencia across from 11/18/23 8 am 23 Good Columbus Victory and Tustin Ranch 11/18/23 8 am 21 Good Road Village Green Park 11/18/23 8 am 16 Good Warner Avenue Light Post 11/18/23 8 am 22 Good WR Nelson Elementary 11/18/23 8 am 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Sunday, November 19, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) (155 to 254) See below for further category descriptions. 24-Hour Particulate Matter Level Concern PeriodLocation Ending of Between Compass and 11/19/23 8 am 14 Good Armstrong Century HS 11/19/23 8 am 42 Good End of Legacy 11/19/23 8 am 10 Good Fire Station 21 11/19/23 8 am 20 Good Fire Station 28 11/19/23 8 am 22 Good Fire Station 6 11/19/23 8 am 23 Good Hangar Fenceline - N 11/19/23 8 am 10 Good Corner Hangar Fenceline - NE 11/19/23 8 am 8 Good Corner Hangar Fenceline - NE 11/19/23 8 am 18 Good Side Hangar Fenceline - S 11/19/23 8 am 7 Good Corner Hangar Fenceline - SW 11/19/23 8 am 8 Good Corner Hangar Fenceline - SW 11/19/23 8 am 12 Good Side Heritage Elementary 11/19/23 8 am 5 Good Hicks Canyon Elementary 11/19/23 8 am 36 Good Legacy Academy 11/19/23 8 am 8 Good Moffett and Tustin Ranch 11/19/23 8 am 9 Good Road OC Animal Shelter 11/19/23 8 am 10 Good OCFD Station 37 11/19/23 8 am 10 Good OCHCA 11/19/23 8 am 5 Good SE Corner Valencia and 11/19/23 8 am 10 Good Armstrong SW Corner Valencia and 11/19/23 8 am 8 Good Legacy The District Gas Station 11/19/23 8 am 5 Good Tustin High School 11/19/23 8 am 5 Good Tustin Legacy Park 11/19/23 8 am 6 Good Valencia across from 11/19/23 8 am 7 Good Columbus Victory and Tustin Ranch 11/19/23 8 am 9 Good Road Village Green Park 11/19/23 8 am 4 Good Warner Avenue Light Post 11/19/23 8 am 9 Good 03534 WR Nelson Elementary 11/19/23 8 am 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Monday, November 20, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location 24-Hour Particulate Matter Level Concern Period Ending (ug/m3) of Between Compass and 11/20/2023 8 am 17 Good Armstrong End of Legacy 11/20/2023 8 am 11 Good Fire Station 21 11/20/2023 8 am 17 Good Fire Station 28 11/20/2023 8 am 21 Good Fire Station 6 11/20/2023 8 am 21 Good Heritage Elementary 11/20/2023 8 am 9 Good Hicks Canyon Elementary 11/20/2023 8 am 27 Good Moffett and Tustin Ranch 11/20/2023 8 am 6 Good Road Northeast Corner of 11/20/2023 8 am 9 Good Hangar Fence Line Northwest Corner of 11/20/2023 8 am 14 Good Hangar Fence Line OC Animal Shelter 11/20/2023 8 am 12 Good OCHCA 11/20/2023 8 am 6 Good SE Corner Valencia and 11/20/2023 8 am 12 Good Armstrong Southeast Corner of 11/20/2023 8 am 9 Good Hangar Fence Line Southwest Corner of 11/20/2023 8 am 10 Good Hangar Fence Line SW Corner Valencia and 11/20/2023 8 am 12 Good Legacy The District Gas Station 11/20/2023 8 am 6 Good Tustin High School 11/20/2023 8 am 4 Good Tustin Legacy Park 11/20/2023 8 am 9 Good Valencia across from 11/20/2023 8 am 7 Good Columbus Victory and Tustin Ranch 11/20/2023 8 am 8 Good Road Village Green Park 11/20/2023 8 am 3 Good Warner Avenue Light Post 11/20/2023 8 am 11 Good 03534 WR Nelson Elementary 11/20/2023 8 am 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. La . •- -• monk- Tuesday, November21, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Hangar Fenceline - SW Corner PeriodLocation 24-Hour Ending 11/21/23 8 am Particulate 12 Good Hangar Fenceline - S Corner 11/21/23 8 am 8 Good Hangar Fenceline - NE Corner 11/21/23 8 am 7 Good Hangar Fenceline - N Corner 11/21/23 8 am 11 Good Hangar Fenceline - SW Side 11/21/23 8 am 13 Good OCHCA 11/21/23 8 am 6 Good Tustin Legacy Park 11/21/23 8 am 9 Good The District (Costco) 11/21/23 8 am 6 Good WR Nelson Elementary 11/21/23 8 am 13 Good Tustin High School 11/21/23 8 am 6 Good Hicks Canyon Elementary 11/21/23 8 am 25 Good Fire Station 21 11/21/23 8 am 15 Good Century High School 11/21/23 8 am 10 Good Fire Station 28 11/21/23 8 am 21 Good Fire Station 6 11/21/23 8 am 21 Good Fire Station 37 11/21/23 8 am 14 Good Legacy Academy 11/21/23 8 am 4 Good Columbus Square Park 11/21/23 8 am 1 Good Heritage Elementary 11/21/23 8 am 15 Good OC Animal Shelter 11/21/23 8 am 9 Good Legacy Road 11/21/23 8 am 8 Good Victory and Tustin Ranch Rd. 11/21/23 8 am 7 Good Moffett and Tustin Ranch 11/21/23 8 am 4 Good Valencia and Armstrong 11/21/23 8 am 9 Good Compass and Armstrong 11/21/23 8 am 15 Good Valencia and Columbus Square 11/21/23 8 am 3 Good Warner Avenue 11/21/23 8 am 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone Hazardous 425-504 Health warning of emergency conditions: ever•ne is more likely r to be affected. Wednesday, November 22, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Century High School PeriodLocation 24-Hour Ending 11/22/2023 8:00 Particulate Matter 11 Level of Concern Good Columbus Square Park 11/22/2023 8:00 6 Good Compass and Armstrong 11/22/2023 8:00 20 Good Fire Station 21 11/22/2023 8:00 3 Good Fire Station 28 11/22/2023 8:00 17 Good Fire Station 37 11/22/2023 8:00 13 Good Fire Station 6 11/22/2023 8:00 14 Good Hangar Fenceline - E Side 11/22/2023 8:00 8 Good Hangar Fenceline - N Corner 11/22/2023 8:00 8 Good Hangar Fenceline - NE Corner 11/22/2023 8:00 8 Good Hangar Fenceline - NE Side 11/22/2023 8:00 11 Good Hangar Fenceline - S Corner 11/22/2023 8:00 8 Good Hangar Fenceline - S Side 11/22/2023 8:00 10 Good Hangar Fenceline - SW Corner 11/22/2023 8:00 14 Good Hangar Fenceline - SW Side 11/22/2023 8:00 11 Good Hangar Fenceline - W Side 11/22/2023 8:00 12 Good Heritage Elementary 11/22/2023 8:00 23 Good Hicks Canyon Elementary 11/22/2023 8:00 17 Good Legacy Academy 11/22/2023 8:00 13 Good Legacy Road 11/22/2023 8:00 8 Good Moffett and Tustin Ranch 11/21/23 10 pm ** 5 Good OC Animal Shelter 11/22/2023 8:00 8 Good OCHCA 11/22/2023 8:00 6 Good The District (Costco) 11/22/2023 8:00 6 Good Tustin High School 11/22/2023 8:00 3 Good Tustin Legacy Park 11/22/2023 8:00 9 Good Valencia and Armstrong 11/22/2023 8:00 12 Good Valencia and Columbus Square 11/22/2023 8:00 17 Good Valencia and Legacy 11/22/2023 8:00 11 Good Victory and Tustin Ranch Rd. 11/22/2023 8:00 6 Good Warner Avenue 11/22/2023 8:00 9 Good WR Nelson Elementary 11/22/2023 8:00 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Friday, November 24, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. What do the Monitors Measure? In addition to asbestos, oxygen, carbon monoxide and sulfur dioxide, the air monitors are checking for specific types of compounds and gases. They are as follows: Particulate Matter Metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Air monitors are also searching for Volatile Organic Compounds (VOCs), a common contaminant. Good Moderate Unhealthy for Unhealthy Very Unhealth Hazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424 (155 to 254) See below for further category descriptions. Location Century High School Period Ending 11/24/2023 8 AM Matter • 14 Level of Good Columbus Square Park 11/24/2023 8 AM 7 Good Compass and Armstrong 11/24/2023 8 AM 25 Good Fire Station 21 11/24/2023 8 AM 11 Good Fire Station 28 11/24/2023 8 AM 19 Good Fire Station 37 11/24/2023 8 AM 21 Good Fire Station 6 11/24/2023 8 AM 18 Good Hangar Fenceline - E Side 11/24/2023 8 AM 10 Good Hangar Fenceline - N Corner 11/24/2023 8 AM 11 Good Hangar Fenceline - NE Corner 11/24/2023 8 AM 11 Good Hangar Fenceline - NE Side 11/24/2023 8 AM 9 Good Hangar Fenceline - S Corner 11/24/2023 8 AM 11 Good Hangar Fenceline - SW Corner 11/24/2023 8 AM 11 Good Hangar Fenceline - SW Side 11/24/2023 8 AM 12 Good Hangar Fenceline - W Side 11/24/2023 8 AM 10 Good Heritage Elementary 11/24/2023 8 AM 30 Good Legacy Academy 11/24/2023 8 AM 15 Good Legacy Road 11/24/2023 8 AM 15 Good Moffet and Tustin Ranch 11/24/2023 8 AM 28 Good Moffett and Tustin Ranch 11/24/2023 8 AM See Navy AQI See Navy AQI OC Animal Shelter 11/24/2023 8 AM 13 Good OCHCA 11/24/2023 8 AM 6 Good The District (Costco) 11/24/2023 8 AM 7 Good Tustin High School 11/24/2023 8 AM 5 Good Tustin Legacy Park 11/24/2023 8 AM 8 Good Valencia and Armstrong 11/24/2023 8 AM 11 Good Valencia and Columbus Square 11/24/2023 8 AM 16 Good Valencia and Legacy 11/24/2023 8 AM 11 Good Victory and Tustin Ranch Rd. 11/24/2023 8 AM 14 Good Warner Avenue 11/24/2023 8 AM 8 Good WR Nelson Elementary 11/24/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone Hazardous 425-504 Health warning of emergency conditions: ever•ne is more likely to •- affected. Friday, November 25, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. What do the Monitors Measure? In addition to asbestos, oxygen, carbon monoxide and sulfur dioxide, the air monitors are checking for specific types of compounds and gases. They are as follows: Particulate Matter Metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Air monitors are also searching for Volatile Organic Compounds (VOCs), a common contaminant. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (155 to 254) See below for further category descriptions. ** Data gap due to power failure Columbus Square Park 11/25/2023 8 AM 9 Good Compass and Armstrong 11/25/2023 8 AM 31 Good Fire Station 21 11/25/2023 8 AM 28 Good Fire Station 28 11/25/2023 8 AM 39 Good Fire Station 37 11/25/2023 8 AM 25 Good Fire Station 6 11/25/2023 8 AM 41 Good Hangar Fenceline - E Side 11/25/2023 8 AM 14 Good Hangar Fenceline - N Corner 11/25/2023 8 AM 14 Good Hangar Fenceline - NE Corner 11/25/2023 8 AM 15 Good Hangar Fenceline - NE Side 11/25/2023 8 AM 13 Good Hangar Fenceline - S Corner 11/25/2023 8 AM 13 Good Hangar Fenceline - S Side 11/25/2023 8 AM 14 Good Hangar Fenceline - SW Corner 11/25/2023 8 AM 17 Good Hangar Fenceline - SW Side 11/25/2023 8 AM 17 Good Hangar Fenceline - W Side 11/25/2023 8 AM 14 Good Heritage Elementary 11/25/2023 8 AM 23 Good Legacy Academy 11/25/2023 8 AM 15 Good Legacy Road 11/25/2023 8 AM 15 Good Moffet and Tustin Ranch 11/25/2023 8 AM 22 Good Moffett and Tustin Ranch 11/25/2023 8 AM See Navy AQI See Navy AQI OC Animal Shelter 11/25/2023 8 AM 9.6 Good OCHCA 11/25/2023 8 AM 6 Good The District (Costco) 11/25/2023 8 AM 6 Good Tustin High School 11/25/2023 8 AM 4 Good Tustin Legacy Park 11/25/2023 8 AM 6 Good Valencia and Armstrong 11/25/2023 8 AM 13 Good Valencia and Columbus Square" 11/25/2023 5 AM 17 Good Valencia and Legacy 11/25/2023 8 AM 13 Good Victory and Tustin Ranch Rd. 11/25/2023 8 AM See Navy AQI See Navy AQI Warner Avenue 11/25/2023 8 AM 10 Good Category Descriptions Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Maroon Hazardous 425-504 Health warning of emergency conditions: ever•ne is more likely to be affected. Sunday, November 26, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. What do the Monitors Measure? In addition to asbestos, oxygen, carbon monoxide and sulfur dioxide, the air monitors are checking for specific types of compounds and gases. They are as follows: Particulate Matter Metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Air monitors are also searching for Volatile Organic Compounds (VOCs), a common contaminant. :Ir Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (155 to 254) See below for further category descriptions. * Data gap due to power failure Columbus Square Park 11/26/2023 8 AM 7 Good Fire Station 21 11/26/2023 8 AM 12 Good Fire Station 28 11/26/2023 8 AM 2 Good Fire Station 37 11/26/2023 8 AM 17 Good Fire Station 6 11/26/2023 8 AM 18 Good Hangar Fenceline - E Side 11/26/2023 8 AM 10 Good Hangar Fenceline - N Corner 11/26/2023 8 AM 9 Good Hangar Fenceline - NE Corner 11/26/2023 8 AM 11 Good Hangar Fenceline - NE Side 11/26/2023 8 AM 9 Good Hangar Fenceline - S Corner 11/26/2023 8 AM 10 Good Hangar Fenceline - S Side" 11/25/2023 2 PM 5 Good Hangar Fenceline - SW Corner 11/26/2023 8 AM 11 Good Hangar Fenceline - SW Side 11/26/2023 8 AM 12 Good Hangar Fenceline - W Side 11/26/2023 8 AM 11 Good Heritage Elementary 11/26/2023 8 AM 20 Good Legacy Academy 11/26/2023 8 AM 9 Good Legacy Road 11/26/2023 8 AM 8 Good Moffet and Tustin Ranch 11/26/2023 8 AM 26 Good OC Animal Shelter 11/26/2023 8 AM 9 Good OCHCA 11/26/2023 8 AM 6 Good The District (Costco) 11/26/2023 8 AM 7 Good Tustin High School 11/26/2023 8 AM 5 Good Tustin Legacy Park 11/26/2023 8 AM 7 Good Valencia and Armstrong 11/26/2023 8 AM 3 Good Valencia and Columbus Square 11/26/2023 8 AM 6 Good Valencia and Legacy 11/26/2023 8 AM 10 Good Victory and Tustin Ranch Rd. 11/26/2023 8 AM 12 Good Warner and Armstrong 11/26/2023 8 AM 12 Good Warner Avenue 11/26/2023 8 AM 16 Good WR Nelson Elementary 11/26/2023 8 AM 15 Good Category Descriptions Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health 11 effects is increased for everyone. Maroon Hazardous 425-504 Health warning of emergency conditions: ever•ne is more likely to be affected. Monday, November 27, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. What do the Monitors Measure? In addition to asbestos, oxygen, carbon monoxide and sulfur dioxide, the air monitors are checking for specific types of compounds and gases. They are as follows: Particulate Matter Metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Air monitors are also searching for Volatile Organic Compounds (VOCs), a common contaminant. :Ir Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (155 to 254) See below for further category descriptions. * Data gap due to power failure Columbus Square Park 11/27/23 8 AM 3 Good Fire Station 21 11/27/23 8 AM 3 Good Fire Station 28 11/27/23 8 AM 13 Good Fire Station 37 11/27/23 8 AM 12 Good Fire Station 6 11/27/23 8 AM 11 Good Hangar Fenceline - E Side 11/27/23 8 AM 92 Moderate Hangar Fenceline - N Corner" 11/27/23 6 AM 4 Good Hangar Fenceline - NE Corner 11/27/23 8 AM 6 Good Hangar Fenceline - NE Side 11/27/23 8 AM 6 Good Hangar Fenceline - S Corner 11/27/23 8 AM 8 Good Hangar Fenceline - S Side" 11/27/23 5 AM 2 Good Hangar Fenceline - SW Corner 11/27/23 8 AM 6 Good Hangar Fenceline - SW Side 11/27/23 8 AM 8 Good Hangar Fenceline - W Side 11/27/23 8 AM 6 Good Heritage Elementary 11/27/23 8 AM 25 Good Legacy Academy 11/27/23 8 AM 16 Good Legacy Road 11/27/23 8 AM 6 Good Moffet and Tustin Ranch 11/27/23 8 AM 13 Good OC Animal Shelter" 11/27/23 8 AM 1 Good OCHCA 11/27/23 8 AM 4 Good The District (Costco) 11/27/23 8 AM 8 Good Tustin High School 11/27/23 8 AM 1 Good Tustin Legacy Park 11/27/23 8 AM 7 Good Valencia and Armstrong 11/27/23 8 AM 3 Good Valencia and Columbus Square 11/27/23 8 AM 2 Good Valencia and Legacy 11/27/23 8 AM 5 Good Victory and Tustin Ranch Rd. 11/27/23 8 AM 7 Good Warner and Armstrong 11/27/23 8 AM 10 Good Warner Avenue 11/27/23 8 AM 4 Good WR Nelson Elementary 11/27/23 8 AM 11 Good Category Descriptions Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health 11 effects is increased for everyone. Maroon Hazardous 425-504 Health warning of emergency conditions: ever•ne is more likely to be affected. Tuesday, November 28, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. What do the Monitors Measure? In addition to asbestos, oxygen, carbon monoxide and sulfur dioxide, the air monitors are checking for specific types of compounds and gases. They are as follows: Particulate Matter Metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Air monitors are also searching for Volatile Organic Compounds (VOCs), a common contaminant. Good Moderate (0 to 54) (55 to 154) Unhealthy for Unhealthy Very Unhealthy Sensitive Groups (255 to 354) (355 to 424) (155 to 254) See below for further category descriptions. * Data gap due to power failure. Instrument damaged due to water truck. Century High School 11/28/23 8 AM 15 Good Columbus Square Park 11/28/23 8 AM 6 Good Fire Station 21 11/28/23 8 AM 9 Good Fire Station 28 11/28/23 8 AM 17 Good Fire Station 37 11/28/23 8 AM 16 Good Fire Station 6 11/28/23 8 AM 17 Good Hangar Fenceline - E Side 11/28/23 8 AM Hangar Fenceline - N Corner 11/28/23 8 AM Hangar Fenceline - NE Corner 11/28/23 8 AM 10 Good Hangar Fenceline - NE Side 11/28/23 8 AM 8 Good Hangar Fenceline - S Corner 11/28/23 8 AM 11 Good Hangar Fenceline - S Side 11/28/23 8 AM 3 Good Hangar Fenceline - SW Corner 11/28/23 8 AM 10 Good Hangar Fenceline - SW Side 11/27/23 6 PM "** Hangar Fenceline - W Side 11/28/23 8 AM 13 Good Heritage Elementary 11/28/23 8 AM 21 Good Legacy Academy 11/28/23 8 AM 11 Good Legacy Road 11/28/23 8 AM 10 Good Moffett and Tustin Ranch 11/28/23 8 AM 11 Good OC Animal Shelter 11/28/23 8 AM 1 Good OCHCA 11/28/23 8 AM 7 Good The District (Costco) 11/28/23 8 AM 9 Good Tustin Field Services 11/28/23 8 AM 6 Good Tustin High School 11/28/23 8 AM 4 Good Tustin Legacy Park 11/28/23 8 AM 9 Good Valencia and Armstrong 11/28/23 7 AM 4 Good Valencia and Columbus Square" 11/28/23 6 AM 5 Good Valencia and Legacy 11/28/23 8 AM 7 Good Victory and Tustin Ranch Rd. 11/28/23 8 AM 15 Good Warner and Armstrong" 11/28/23 3 AM 10 Good Warner Avenue 11/28/23 8 AM 3 Good Category Descriptions Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425-504 Health warning of emergency conditions: ever•ne is more likely to be affected. Wednesday, November 29, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. What do the Monitors Measure? In addition to asbestos, oxygen, carbon monoxide and sulfur dioxide, the air monitors are checking for specific types of compounds and gases. They are as follows: Particulate Matter Metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Air monitors are also searching for Volatile Organic Compounds (VOCs), a common contaminant. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (155 to 254) * See below for further category descriptions. ** Data gap due to power failure. *** Residual water damage, instrument replaced. Instrument malfunction, instrument replaced. Century High School 11/29/2023 8 AM 11 Good Columbus Square Park 11/29/2023 8 AM 7 Good Fire Station 21 11/29/2023 8 AM 28 Good Fire Station 28 11/29/2023 8 AM 39 Good Fire Station 37 11/29/2023 8 AM 23 Good Fire Station 6 11/29/2023 8 AM 41 Good Hangar Fenceline - E Side 11/29/2023 8 AM *** *** Hangar Fenceline - N Center 11/29/2023 8 AM 10 Good Hangar Fenceline - N Corner 11/29/2023 8 AM 4 Good Hangar Fenceline - NE Corner 11/29/2023 8 AM 11 Good Hangar Fenceline - NE Side 11/29/2023 8 AM 10 Good Hangar Fenceline - S Corner 11/29/2023 8 AM 12 Good Hangar Fenceline - S Side 11/29/2023 8 AM 4 Good Hangar Fenceline - SW Corner 11/29/2023 8 AM 12 Good Hangar Fenceline - SW Side** 11/29/2023 8 AM 11 Good Hangar Fenceline - W Side 11/29/2023 8 AM 10 Good Heritage Elementary 11/29/2023 8 AM 22 Good Legacy Academy** 11/29/2023 8 AM 12 Good Legacy Road 11/29/2023 8 AM 9 Good Moffett and Tustin Ranch 11/29/2023 8 AM **** **** OC Animal Shelter 11/29/2023 8 AM 12 Good OCHCA 11/29/2023 8 AM 6 Good The District (Costco) 11/29/2023 8 AM 6 Good Tustin Field Services 11/29/2023 8 AM 6 Good Tustin High School 11/29/2023 8 AM 4 Good Tustin Legacy Park 11/29/2023 8 AM 3 Good Valencia and Armstrong 11/29/2023 8 AM 6 Good Valencia and Columbus Square 11/29/2023 8 AM 8 Good Valencia and Legacy 11/29/2023 8 AM 11 Good Victory and Tustin Ranch Rd. 11/29/2023 8 AM 15 Good Warner and Armstrong 11/29/2023 8 AM 20 Good Warner Avenue 11/29/2023 8 AM 6 Good WR Nelson Elementary 11/29/2023 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425-504 Health warning of emergency conditions:Maroon everyone - likely ..- affected. Thursday, November 30, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for Unhealthy Very Unhealtir Hazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (155 to 254) * See below for further category descriptions. " Data gap due to power failure. *`* Data gap due to instrument malfunction, instrument recalibrated. Location Century High School 24-Hour Period Ending 11/30/2023 8 AM Matter • 13 Level of Concern Good Columbus Square Park 11/30/2023 8 AM 5 Good Fire Station 21 11/30/2023 8 AM 11 Good Fire Station 28 11/30/2023 8 AM 14 Good Fire Station 37*** 11/30/2023 8 AM 11 Good Fire Station 6 11/30/2023 8 AM 14 Good Hangar Fenceline - E Side 11/30/2023 8 AM 11 Good Hangar Fenceline - N Center** 11/30/2023 8 AM 4 Good Hangar Fenceline - N Corner 11/30/2023 8 AM 8 Good Hangar Fenceline - NE Corner 11/30/2023 8 AM 9 Good Hangar Fenceline - NE Side 11/30/2023 8 AM 7 Good Hangar Fenceline - S Corner 11/30/2023 8 AM 8 Good Hangar Fenceline - S Side 11/30/2023 8 AM 1 Good Hangar Fenceline - SW Corner 11/30/2023 8 AM 10 Good Hangar Fenceline - SW Side 11/30/2023 8 AM 7 Good Hangar Fenceline - W Side 11/30/2023 8 AM 7 Good Heritage Elementary 11/30/2023 8 AM 9 Good Legacy Academy*** 11/30/2023 8 AM 7 Good Legacy Road 11/30/2023 8 AM 8 Good Moffett and Tustin Ranch 11/30/2023 8 AM 12 Good OC Animal Shelter 11/30/2023 8 AM 4 Good OCHCA 11/30/2023 8 AM 3 Good The District (Costco) 11/30/2023 8 AM 5 Good Tustin Field Services 11/30/2023 8 AM 5 Good Tustin High School 11/30/2023 8 AM 2 Good Tustin Legacy Park 11/30/2023 8 AM 5 Good Valencia and Armstrong 11/30/2023 8 AM 5 Good Valencia and Columbus Square 11/30/2023 8 AM 5 Good Valencia and Legacy 11/30/2023 8 AM 7 Good Victory and Tustin Ranch Rd. 11/30/2023 8 AM 10 Good Warner and Armstrong 11/30/2023 8 AM 9 Good Warner Avenue 11/30/2023 8 AM 5 Good WR Nelson Elementary 11/30/2023 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health Hazardous 425-504 veryone. Health warning of emergency Maroon conditions: ever•ne is more likely to be affected. Friday, December 1, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. r Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) Wj Unhealthy Very Unhealthy (255 to 354) (355 to 424) * See below for further category descriptions. ** Data gap due to instrument malfunction, instrument recalibrated Century High School PeriodLocation 24-Hour Ending 12/1/2023 8 AM Particulate Matter 14 Level of Concern Good Columbus Square Park 12/1/2023 8 AM 6 Good Fire Station 21 12/1/2023 8 AM 10 Good Fire Station 28 12/1/2023 8 AM 15 Good Fire Station 37** 12/1/2023 8 AM 6 Good Fire Station 6 12/1/2023 8 AM 14 Good Hangar Fenceline - E Side 12/1/2023 8 AM 9 Good Hangar Fenceline - N Center 12/1/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/1/2023 8 AM 9 Good Hangar Fenceline - NE Corner 12/1/2023 8 AM 9 Good Hangar Fenceline - NE Side 12/1/2023 8 AM 8 Good Hangar Fenceline - S Corner 12/1/2023 8 AM 8 Good Hangar Fenceline - S Side 12/1/2023 8 AM 4 Good Hangar Fenceline - SW Corner 12/1/2023 8 AM 8 Good Hangar Fenceline - SW Side 12/1/2023 8 AM 10 Good Hangar Fenceline - W Side 12/1/2023 8 AM 8 Good Heritage Elementary 12/1/2023 8 AM 8 Good Legacy Academy** 12/1/2023 8 AM 7 Good Legacy Road 12/1/2023 8 AM 10 Good Moffett and Tustin Ranch** 12/1/2023 8 AM 9 Good OC Animal Shelter 12/1/2023 8 AM 5 Good OCHCA 12/1/2023 8 AM 3 Good The District (Costco) 12/1/2023 8 AM 5 Good Tustin Field Services 12/1/2023 8 AM 5 Good Tustin High School 12/1/2023 8 AM 2 Good Tustin Legacy Park 12/1/2023 8 AM 7 Good Valencia and Armstrong 12/1/2023 8 AM 5 Good Valencia and Columbus Square 12/1/2023 8 AM 6 Good Valencia and Legacy 12/1/2023 8 AM 9 Good Victory and Tustin Ranch Rd. 12/1/2023 8 AM 9 Good Warner and Armstrong 12/1/2023 8 AM 3 Good Warner Avenue 12/1/2023 8 AM 9 Good WR Nelson Elementary 12/1/2023 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425-504 Health warning of emer, conditions: ever• ore likely to be affected. Saturday, December 2, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) * See below for further category descriptions. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/2/2023 8 AM Particulate 15 Good Columbus Square Park 12/2/2023 8 AM 10 Good Fire Station 21 12/2/2023 8 AM 11 Good Fire Station 28 12/2/2023 8 AM 19 Good Fire Station 37 12/2/2023 8 AM 14 Good Fire Station 6 12/2/2023 8 AM 17 Good Hangar Fenceline - E Side 12/2/2023 8 AM 11 Good Hangar Fenceline - N Center 12/2/2023 8 AM 13 Good Hangar Fenceline - N Corner 12/2/2023 8 AM 14 Good Hangar Fenceline - NE Corner 12/2/2023 8 AM 15 Good Hangar Fenceline - NE Side 12/2/2023 8 AM 13 Good Hangar Fenceline - S Corner 12/2/2023 8 AM 15 Good Hangar Fenceline - S Side 12/2/2023 8 AM 3 Good Hangar Fenceline - SW Corner 12/2/2023 8 AM 16 Good Hangar Fenceline - SW Side 12/2/2023 8 AM 18 Good Hangar Fenceline - W Side 12/2/2023 8 AM 14 Good Heritage Elementary 12/2/2023 8 AM 13 Good Legacy Academy 12/2/2023 8 AM 17 Good Legacy Road 12/2/2023 8 AM 18 Good Moffett and Tustin Ranch 12/2/2023 8 AM 15 Good OC Animal Shelter 12/2/2023 8 AM 16 Good OCHCA 12/2/2023 8 AM 5 Good The District (Costco) 12/2/2023 8 AM 7 Good Tustin Field Services 12/2/2023 8 AM 6 Good Tustin High School 12/2/2023 8 AM 4 Good Tustin Legacy Park 12/2/2023 8 AM 7 Good Valencia and Armstrong 12/2/2023 8 AM 10 Good Valencia and Columbus Square 12/2/2023 8 AM 12 Good Valencia and Legacy 12/2/2023 8 AM 16 Good Victory and Tustin Ranch Rd. 12/2/2023 8 AM 17 Good Warner and Armstrong 12/2/2023 8 AM 9 Good Warner Avenue 12/2/2023 8 AM 10 Good WR Nelson Elementary 12/2/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Sunday, December 3, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 See below for further category descriptions. Instrument malfunction, instrument enclosure replaced. *" Instrument malfunction, additional maintenance and recalibration performed. Location Century High School 24-Hour Period Ending 12/3/2023 8 AM Matter • 37 Level of • Good Columbus Square Park 12/3/2023 8 AM 9 Good Fire Station 21 12/3/2023 8 AM 29 Good Fire Station 28 12/3/2023 8 AM 35 Good Fire Station 37 12/3/2023 8 AM 11 Good Fire Station 6 12/3/2023 8 AM 33 Good Hangar Fenceline - E Side 12/3/2023 8 AM 12 Good Hangar Fenceline - N Center 12/3/2023 8 AM 15 Good Hangar Fenceline - N Corner 12/3/2023 8 AM 16 Good Hangar Fenceline - NE Corner 12/3/2023 8 AM 15 Good Hangar Fenceline - NE Side 12/3/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/3/2023 8 AM 18 Good Hangar Fenceline - S Side 12/3/2023 8 AM ** ** Hangar Fenceline - SW Corner 12/3/2023 8 AM 18 Good Hangar Fenceline - SW Side 12/3/2023 8 AM 15 Good Hangar Fenceline - W Side 12/3/2023 8 AM 13 Good Heritage Elementary 12/3/2023 8 AM *** *** Legacy Academy 12/3/2023 8 AM 17 Good Legacy Road 12/3/2023 8 AM 16 Good Moffett and Tustin Ranch 12/3/2023 8 AM 16 Good OC Animal Shelter 12/3/2023 8 AM 17 Good OCHCA 12/3/2023 8 AM 6 Good The District (Costco) 12/3/2023 8 AM 6 Good Tustin Field Services 12/3/2023 8 AM 9 Good Tustin High School 12/3/2023 8 AM 3 Good Tustin Legacy Park 12/3/2023 8 AM 6 Good Valencia and Armstrong 12/3/2023 8 AM 11 Good Valencia and Columbus Square 12/3/2023 8 AM 9 Good Valencia and Legacy 12/3/2023 8 AM 14 Good Victory and Tustin Ranch Rd. 12/3/2023 8 AM 17 Good Warner and Armstrong 12/3/2023 8 AM 8 Good Warner Avenue 12/3/2023 8 AM 9 Good WR Nelson Elementary 12/3/2023 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. LurpleVery Sunday, December 4, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 See below for further category descriptions. Instrument malfunction, instrument enclosure replaced. *" Instrument malfunction, additional maintenance and recalibration performed. Location Century High School 24-Hour Period Ending 12/4/2023 8 AM Matter • 65 Level of • Moderate Columbus Square Park 12/4/2023 8 AM 20 Good Fire Station 21 12/4/2023 8 AM 51 Good Fire Station 28 12/4/2023 8 AM 86 Moderate Fire Station 37 12/4/2023 8 AM 22 Good Fire Station 6 12/4/2023 8 AM 67 Moderate Hangar Fenceline - E Side 12/4/2023 8 AM 24 Good Hangar Fenceline - N Center 12/4/2023 8 AM 31 Good Hangar Fenceline - N Corner 12/4/2023 8 AM 30 Good Hangar Fenceline - NE Corner 12/4/2023 8 AM 30 Good Hangar Fenceline - NE Side 12/4/2023 8 AM 26 Good Hangar Fenceline - S Corner 12/4/2023 8 AM 33 Good Hangar Fenceline - S Side 12/4/2023 8 AM 31 Good Hangar Fenceline - SW Corner 12/4/2023 8 AM 38 Good Hangar Fenceline - SW Side 12/4/2023 8 AM 35 Good Hangar Fenceline - W Side 12/4/2023 8 AM 29 Good Heritage Elementary 12/4/2023 8 AM 28 Good Legacy Academy 12/4/2023 8 AM 33 Good Legacy Road 12/4/2023 8 AM 32 Good Moffett and Tustin Ranch 12/4/2023 8 AM 33 Good OC Animal Shelter 12/4/2023 8 AM 31 Good OCHCA 12/4/2023 8 AM 19 Good The District (Costco) 12/4/2023 8 AM 22 Good Tustin Field Services 12/4/2023 8 AM 1 Good Tustin High School 12/4/2023 8 AM 11 Good Tustin Legacy Park 12/4/2023 8 AM 1 Good Valencia and Armstrong 12/4/2023 8 AM 25 Good Valencia and Columbus Square 12/4/2023 8 AM 18 Good Valencia and Legacy 12/4/2023 8 AM 29 Good Victory and Tustin Ranch Rd. 12/4/2023 8 AM 33 Good Warner and Armstrong 12/4/2023 8 AM 19 Good Warner Avenue 12/4/2023 8 AM 23 Good WR Nelson Elementary 12/4/2023 8 AM 51 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. LurpleVery Tuesday, December 5, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) * See below for further category descriptions. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/5/2023 8 AM Particulate 21 Good Columbus Square Park 12/5/2023 8 AM 31 Good Fire Station 21 12/5/2023 8 AM 15 Good Fire Station 28 12/5/2023 8 AM 23 Good Fire Station 37 12/5/2023 8 AM 35 Good Fire Station 6 12/5/2023 8 AM 22 Good Hangar Fenceline - E Side 12/5/2023 8 AM 38 Good Hangar Fenceline - N Center 12/5/2023 8 AM 42 Good Hangar Fenceline - N Corner 12/5/2023 8 AM 45 Good Hangar Fenceline - NE Corner 12/5/2023 8 AM 46 Good Hangar Fenceline - NE Side 12/5/2023 8 AM 42 Good Hangar Fenceline - S Corner 12/5/2023 8 AM 50 Good Hangar Fenceline - S Side 12/5/2023 8 AM 45 Good Hangar Fenceline - SW Corner 12/5/2023 8 AM 53 Good Hangar Fenceline - SW Side 12/5/2023 8 AM 52 Good Hangar Fenceline - W Side 12/5/2023 8 AM 43 Good Heritage Elementary 12/5/2023 8 AM 42 Good Legacy Academy 12/5/2023 8 AM 53 Good Legacy Road 12/5/2023 8 AM 54 Good Moffett and Tustin Ranch 12/5/2023 8 AM 57 Moderate OC Animal Shelter 12/5/2023 8 AM 50 Good OCHCA 12/5/2023 8 AM 6 Good The District (Costco) 12/5/2023 8 AM 8 Good Tustin Field Services 12/5/2023 8 AM 6 Good Tustin High School 12/5/2023 8 AM 5 Good Tustin Legacy Park 12/5/2023 8 AM 24 Good Valencia and Armstrong 12/5/2023 8 AM 38 Good Valencia and Columbus Square 12/5/2023 8 AM 27 Good Valencia and Legacy 12/5/2023 8 AM 45 Good Victory and Tustin Ranch Rd. 12/5/2023 8 AM 55 Moderate Warner and Armstrong 12/5/2023 8 AM 29 Good Warner Avenue 12/5/2023 8 AM 39 Good WR Nelson Elementary 12/5/2023 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Wednesday, December 6, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) See below for further category descriptions. ** Data gap due to power failure, instrument replaced. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/6/2023 8 AM Particulate Matter • 29 Level of Concern Good Columbus Square Park 12/6/2023 8 AM 18 Good Fire Station 21 12/6/2023 8 AM 23 Good Fire Station 28 12/6/2023 8 AM 32 Good Fire Station 37 12/6/2023 8 AM 20 Good Fire Station 6 12/6/2023 8 AM 31 Good Hangar Fenceline - E Side 12/6/2023 8 AM 21 Good Hangar Fenceline - N Center 12/6/2023 8 AM 24 Good Hangar Fenceline - N Corner 12/6/2023 8 AM 25 Good Hangar Fenceline - NE Corner 12/6/2023 8 AM 19 Good Hangar Fenceline - NE Side 12/6/2023 8 AM 22 Good Hangar Fenceline - S Corner 12/6/2023 8 AM 29 Good Hangar Fenceline - S Side 12/6/2023 8 AM 37 Good Hangar Fenceline - SW Corner 12/6/2023 8 AM 32 Good Hangar Fenceline - SW Side 12/6/2023 8 AM 27 Good Hangar Fenceline - W Side 12/6/2023 8 AM 26 Good Heritage Elementary 12/6/2023 8 AM 22 Good Legacy Academy 12/6/2023 8 AM 28 Good Legacy Road 12/6/2023 8 AM 29 Good Moffett and Tustin Ranch 12/6/2023 8 AM 28 Good OC Animal Shelter 12/6/2023 8 AM ** ** OCHCA 12/6/2023 8 AM 9 Good The District (Costco) 12/6/2023 8 AM 14 Good Tustin Field Services 12/6/2023 8 AM 8 Good Tustin High School 12/6/2023 8 AM 4 Good Tustin Legacy Park 12/6/2023 8 AM 15 Good Valencia and Armstrong 12/6/2023 8 AM 19 Good Valencia and Columbus Square 12/6/2023 8 AM 14 Good Valencia and Legacy 12/6/2023 8 AM 24 Good Victory and Tustin Ranch Rd. 12/6/2023 8 AM 40 Good Warner and Armstrong 12/6/2023 8 AM 12 Good Warner Avenue 12/6/2023 8 AM 21 Good WR Nelson Elementary 12/6/2023 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. L Thursday, December 7, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) * See below for further category descriptions. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/7/2023 8 AM Particulate 38 Good Columbus Square Park 12/7/2023 8 AM 16 Good Fire Station 21 12/7/2023 8 AM 33 Good Fire Station 28 12/7/2023 8 AM 39 Good Fire Station 37 12/7/2023 8 AM 20 Good Fire Station 6 12/7/2023 8 AM 39 Good Hangar Fenceline - E Side 12/7/2023 8 AM 21 Good Hangar Fenceline - N Center 12/7/2023 8 AM 25 Good Hangar Fenceline - N Corner 12/7/2023 8 AM 25 Good Hangar Fenceline - NE Corner 12/7/2023 8 AM 25 Good Hangar Fenceline - NE Side 12/7/2023 8 AM 22 Good Hangar Fenceline - S Corner 12/7/2023 8 AM 26 Good Hangar Fenceline - S Side 12/7/2023 8 AM 29 Good Hangar Fenceline - SW Corner 12/7/2023 8 AM 28 Good Hangar Fenceline - SW Side 12/7/2023 8 AM 26 Good Hangar Fenceline - W Side 12/7/2023 8 AM 24 Good Heritage Elementary 12/7/2023 8 AM 23 Good Legacy Academy 12/7/2023 8 AM 31 Good Legacy Road 12/7/2023 8 AM 28 Good Moffett and Tustin Ranch 12/7/2023 8 AM 31 Good OC Animal Shelter 12/7/2023 8 AM 26 Good OCHCA 12/7/2023 8 AM 9 Good The District (Costco) 12/7/2023 8 AM 12 Good Tustin Field Services 12/7/2023 8 AM 7 Good Tustin High School 12/7/2023 8 AM 7 Good Tustin Legacy Park 12/7/2023 8 AM 13 Good Valencia and Armstrong 12/7/2023 8 AM 21 Good Valencia and Columbus Square 12/7/2023 8 AM 13 Good Valencia and Legacy 12/7/2023 8 AM 25 Good Victory and Tustin Ranch Rd. 12/7/2023 8 AM 32 Good Warner and Armstrong 12/7/2023 8 AM 11 Good Warner Avenue 12/7/2023 8 AM 21 Good WR Nelson Elementary 12/7/2023 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Friday, December 8, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument recalibrated. Very Unhealthy (355 to 424) Location Century High School 24-Hour Period Ending 12/8/2023 8 AM Matter • 21 Level of • Good Columbus Square Park 12/8/2023 8 AM 11 Good Fire Station 21 12/8/2023 8 AM 17 Good Fire Station 28 12/8/2023 8 AM 22 Good Fire Station 37 12/8/2023 8 AM 12 Good Fire Station 6 12/8/2023 8 AM 22 Good Hangar Fenceline - E Side 12/8/2023 8 AM 12 Good Hangar Fenceline - N Center 12/8/2023 8 AM 13 Good Hangar Fenceline - N Corner 12/8/2023 8 AM 15 Good Hangar Fenceline - NE Corner 12/8/2023 8 AM 16 Good Hangar Fenceline - NE Side 12/8/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/8/2023 8 AM 16 Good Hangar Fenceline - S Side 12/8/2023 8 AM 17 Good Hangar Fenceline - SW Corner 12/8/2023 8 AM 19 Good Hangar Fenceline - SW Side 12/8/2023 8 AM 16 Good Hangar Fenceline - W Side 12/8/2023 8 AM 13 Good Heritage Elementary 12/8/2023 8 AM 14 Good Legacy Academy 12/8/2023 8 AM 18 Good Legacy Road 12/8/2023 8 AM 17 Good Moffett and Tustin Ranch 12/8/2023 8 AM ** ** OC Animal Shelter 12/8/2023 8 AM 16 Good OCHCA 12/8/2023 8 AM 7 Good The District (Costco) 12/8/2023 8 AM 8 Good Tustin Field Services 12/8/2023 8 AM 6 Good Tustin High School 12/8/2023 8 AM 1 Good Tustin Legacy Park 12/8/2023 8 AM 11 Good Valencia and Armstrong 12/8/2023 8 AM 13 Good Valencia and Columbus Square 12/8/2023 8 AM 9 Good Valencia and Legacy 12/8/2023 8 AM 18 Good Victory and Tustin Ranch Rd. 12/8/2023 8 AM 20 Good Warner and Armstrong 12/8/2023 8 AM 7 Good Warner Avenue 12/8/2023 8 AM 8 Good WR Nelson Elementary 12/8/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for e. Ii 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, December 9, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to power failure. Data gap due to instrument malfunction, instrument recalibrated. Very Unhealthy Hazardous (355 to 424) (425-504) Location Century High School 24-Hour Period Ending 12/9/2023 8 AM Matter 9 Level of • Good Columbus Square Park 12/9/2023 8 AM 13 Good Fire Station 21 12/9/2023 8 AM 5 Good Fire Station 28 12/9/2023 8 AM 15 Good Fire Station 37 12/9/2023 8 AM 15 Good Fire Station 6 12/9/2023 8 AM 20 Good Hangar Fenceline - E Side 12/9/2023 8 AM 15 Good Hangar Fenceline - N Center 12/9/2023 8 AM 17 Good Hangar Fenceline - N Corner 12/9/2023 8 AM 19 Good Hangar Fenceline - NE Corner 12/9/2023 8 AM 20 Good Hangar Fenceline - NE Side 12/9/2023 8 AM 11 Good Hangar Fenceline - S Corner** 12/9/2023 8 AM 18 Good Hangar Fenceline - S Side 12/9/2023 8 AM 29 Good Hangar Fenceline - SW Corner 12/9/2023 8 AM 27 Good Hangar Fenceline - SW Side 12/9/2023 8 AM 24 Good Hangar Fenceline - W Side 12/9/2023 8 AM 19 Good Heritage Elementary 12/9/2023 8 AM 19 Good Legacy Academy 12/9/2023 8 AM 23 Good Legacy Road 12/9/2023 8 AM 22 Good Moffett and Tustin Ranch*** 12/9/2023 8 AM 26 Good OC Animal Shelter 12/9/2023 8 AM 22 Good OCHCA 12/9/2023 8 AM 7 Good The District (Costco) 12/9/2023 8 AM 8 Good Tustin Field Services 12/9/2023 8 AM 7 Good Tustin High School 12/9/2023 8 AM 2 Good Tustin Legacy Park 12/9/2023 8 AM 10 Good Valencia and Armstrong** 12/9/2023 8 AM 16 Good Valencia and Columbus Square 12/9/2023 8 AM 11 Good Valencia and Legacy 12/9/2023 8 AM 21 Good Victory and Tustin Ranch Rd. 12/9/2023 8 AM 29 Good Warner and Armstrong 12/9/2023 8 AM 11 Good Warner Avenue 12/9/2023 8 AM 14 Good WR Nelson Elementary 12/9/2023 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Sunday, December 10, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to power failure. Very Unhealthy Hazardous (355 to 424) (425-504) Location Century High School Period Ending 12/10/2023 8 AM Matter 8 Level of Concern Good Columbus Square Park 12/10/2023 8 AM 6 Good Fire Station 21 12/10/2023 8 AM 9 Good Fire Station 28 12/10/2023 8 AM 17 Good Fire Station 37 12/10/2023 8 AM 4 Good Fire Station 6 12/10/2023 8 AM 20 Good Hangar Fenceline - E Side 12/10/2023 8 AM 7 Good Hangar Fenceline - N Center 12/10/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/10/2023 8 AM 8 Good Hangar Fenceline - NE Corner 12/10/2023 8 AM 10 Good Hangar Fenceline - NE Side 12/10/2023 8 AM 4 Good Hangar Fenceline - S Corner 12/10/2023 8 AM 11 Good Hangar Fenceline - S Side 12/10/2023 8 AM 20 Good Hangar Fenceline - SW Corner 12/10/2023 8 AM 10 Good Hangar Fenceline - SW Side 12/10/2023 8 AM 11 Good Hangar Fenceline - W Side 12/10/2023 8 AM 16 Good Heritage Elementary 12/10/2023 8 AM 8 Good Legacy Academy 12/10/2023 8 AM 10 Good Legacy Road 12/10/2023 8 AM 10 Good Moffett and Tustin Ranch 12/10/2023 8 AM 12 Good OC Animal Shelter 12/10/2023 8 AM 11 Good OCHCA 12/10/2023 8 AM 5 Good The District (Costco) 12/10/2023 8 AM 3 Good Tustin Field Services 12/10/2023 8 AM 9 Good Tustin High School 12/10/2023 8 AM 2 Good Tustin Legacy Park 12/10/2023 8 AM 8 Good Valencia and Armstrong 12/10/2023 8 AM 6 Good Valencia and Columbus Square 12/10/2023 8 AM 4 Good Valencia and Legacy 12/10/2023 8 AM 9 Good Victory and Tustin Ranch Rd. 12/10/2023 8 AM 15 Good Warner and Armstrong" 12/10/2023 8 AM 8 Good Warner Avenue 12/10/2023 8 AM 6 Good WR Nelson Elementary 12/10/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Monday, December 11, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/11/2023 8 AM Matter 29 Level of Concern Good Columbus Square Park 12/11/2023 8 AM 7 Good Fire Station 21 12/11/2023 8 AM 20 Good Fire Station 28 12/11/2023 8 AM 28 Good Fire Station 37 12/11/2023 8 AM 7 Good Fire Station 6 12/11/2023 8 AM 36 Good Hangar Fenceline - E Side 12/11/2023 8 AM 10 Good Hangar Fenceline - N Center 12/11/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/11/2023 8 AM 12 Good Hangar Fenceline - NE Corner 12/11/2023 8 AM 15 Good Hangar Fenceline - NE Side 12/11/2023 8 AM 4 Good Hangar Fenceline - S Corner 12/11/2023 8 AM 18 Good Hangar Fenceline - S Side 12/11/2023 8 AM 21 Good Hangar Fenceline - SW Corner 12/11/2023 8 AM 19 Good Hangar Fenceline - SW Side 12/11/2023 8 AM 14 Good Hangar Fenceline - W Side 12/11/2023 8 AM 14 Good Heritage Elementary 12/11/2023 8 AM 13 Good Legacy Academy 12/11/2023 8 AM 12 Good Legacy Road 12/11/2023 8 AM 11 Good Moffett and Tustin Ranch 12/11/2023 8 AM 15 Good OC Animal Shelter 12/11/2023 8 AM 13 Good OCHCA 12/11/2023 8 AM 16 Good The District (Costco) 12/11/2023 8 AM 19 Good Tustin Field Services 12/11/2023 8 AM 6 Good Tustin High School 12/11/2023 8 AM 4 Good Tustin Legacy Park 12/11/2023 8 AM 24 Good Valencia and Armstrong 12/11/2023 8 AM 8 Good Valencia and Columbus Square 12/11/2023 8 AM 5 Good Valencia and Legacy 12/11/2023 8 AM 10 Good Victory and Tustin Ranch Rd. 12/11/2023 8 AM 28 Good Warner and Armstrong 12/11/2023 8 AM ** ** Warner Avenue 12/11/2023 8 AM 9 Good WR Nelson Elementary 12/11/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Tuesday, December 12, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/12/2023 8 AM Matter 36 Level of Concern Good Columbus Square Park 12/12/2023 8 AM 9 Good Fire Station 21 12/12/2023 8 AM 33 Good Fire Station 28 12/12/2023 8 AM 46 Good Fire Station 37 12/12/2023 8 AM 13 Good Fire Station 6 12/12/2023 8 AM 44 Good Hangar Fenceline - E Side 12/12/2023 8 AM 12 Good Hangar Fenceline - N Center 12/12/2023 8 AM 12 Good Hangar Fenceline - N Corner 12/12/2023 8 AM 15 Good Hangar Fenceline - NE Corner 12/12/2023 8 AM 16 Good Hangar Fenceline - NE Side 12/12/2023 8 AM 5 Good Hangar Fenceline - S Corner 12/12/2023 8 AM 21 Good Hangar Fenceline - S Side 12/12/2023 8 AM 18 Good Hangar Fenceline - SW Corner 12/12/2023 8 AM 25 Good Hangar Fenceline - SW Side 12/12/2023 8 AM 15 Good Hangar Fenceline - W Side 12/12/2023 8 AM 14 Good Heritage Elementary 12/12/2023 8 AM 16 Good Legacy Academy 12/12/2023 5 AM 16 Good Legacy Road 12/12/2023 8 AM 15 Good Moffett and Tustin Ranch 12/12/2023 8 AM 22 Good OC Animal Shelter 12/12/2023 8 AM 18 Good OCHCA 12/12/2023 8 AM 11 Good The District (Costco) 12/12/2023 8 AM 14 Good Tustin Field Services 12/12/2023 8 AM 7 Good Tustin High School 12/12/2023 8 AM 5 Good Tustin Legacy Park 12/12/2023 8 AM 16 Good Valencia and Armstrong 12/12/2023 8 AM 11 Good Valencia and Columbus Square 12/12/2023 8 AM 9 Good Valencia and Legacy 12/12/2023 8 AM 14 Good Victory and Tustin Ranch Rd. 12/12/2023 8 AM 32 Good Warner and Armstrong 12/12/2023 8 AM 9 Good Warner Avenue 12/12/2023 8 AM 18 Good WR Nelson Elementary 12/12/2023 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Wednesday, December 13, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/13/2023 8 AM Matter 59 Level of Concern Moderate Columbus Square Park 12/13/2023 8 AM 15 Good Fire Station 21 12/13/2023 8 AM 71 Moderate Fire Station 28 12/13/2023 8 AM 49 Good Fire Station 37 12/13/2023 8 AM 13 Good Fire Station 6 12/13/2023 8 AM 52 Good Hangar Fenceline - E Side 12/13/2023 8 AM 17 Good Hangar Fenceline - N Center 12/13/2023 8 AM 16 Good Hangar Fenceline - N Corner 12/13/2023 8 AM 21 Good Hangar Fenceline - NE Corner 12/13/2023 8 AM 22 Good Hangar Fenceline - NE Side 12/13/2023 8 AM 8 Good Hangar Fenceline - S Corner 12/13/2023 8 AM 24 Good Hangar Fenceline - S Side 12/13/2023 8 AM 24 Good Hangar Fenceline - SW Corner 12/13/2023 8 AM 25 Good Hangar Fenceline - SW Side 12/13/2023 8 AM 22 Good Hangar Fenceline - W Side 12/13/2023 8 AM 19 Good Heritage Elementary 12/13/2023 8 AM 21 Good Legacy Academy 12/13/2023 8 AM 26 Good Legacy Road 12/13/2023 8 AM 24 Good Moffett and Tustin Ranch 12/13/2023 8 AM 32 Good OC Animal Shelter 12/13/2023 8 AM 24 Good OCHCA 12/13/2023 8 AM 13 Good The District (Costco) 12/13/2023 8 AM 14 Good Tustin Field Services 12/13/2023 8 AM 9 Good Tustin High School 12/13/2023 8 AM 11 Good Tustin Legacy Park 12/13/2023 8 AM 28 Good Valencia and Armstrong 12/13/2023 8 AM 17 Good Valencia and Columbus Square 12/13/2023 8 AM 12 Good Valencia and Legacy 12/13/2023 8 AM 23 Good Victory and Tustin Ranch Rd. 12/13/2023 8 AM 28 Good Warner and Armstrong 12/13/2023 8 AM 12 Good Warner Avenue 12/13/2023 8 AM 18 Good WR Nelson Elementary 12/13/2023 8 AM 54 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Thursday, December 14, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/14/2023 8 AM Matter 51 Level of Concern Good Columbus Square Park 12/14/2023 8 AM 22 Good Fire Station 21 12/14/2023 8 AM 51 Good Fire Station 28 12/14/2023 8 AM 44 Good Fire Station 37 12/14/2023 8 AM 24 Good Fire Station 6 12/14/2023 8 AM 50 Good Hangar Fenceline - E Side 12/14/2023 8 AM 29 Good Hangar Fenceline - N Center 12/14/2023 8 AM 23 Good Hangar Fenceline - N Corner 12/14/2023 8 AM 32 Good Hangar Fenceline - NE Corner 12/14/2023 8 AM 33 Good Hangar Fenceline - NE Side 12/14/2023 8 AM 14 Good Hangar Fenceline - S Corner 12/14/2023 8 AM 35 Good Hangar Fenceline - S Side 12/14/2023 8 AM 36 Good Hangar Fenceline - SW Corner 12/14/2023 8 AM 35 Good Hangar Fenceline - SW Side 12/14/2023 8 AM 34 Good Hangar Fenceline - W Side 12/14/2023 8 AM 29 Good Heritage Elementary 12/14/2023 8 AM 31 Good Legacy Academy 12/14/2023 8 AM 32 Good Legacy Road 12/14/2023 8 AM 37 Good Moffett and Tustin Ranch 12/14/2023 8 AM 46 Good OC Animal Shelter 12/14/2023 8 AM 35 Good OCHCA 12/14/2023 8 AM 12 Good The District (Costco) 12/14/2023 8 AM 16 Good Tustin Field Services 12/14/2023 8 AM 7 Good Tustin High School 12/14/2023 8 AM 11 Good Tustin Legacy Park 12/14/2023 8 AM 20 Good Valencia and Armstrong 12/14/2023 8 AM 28 Good Valencia and Columbus Square 12/14/2023 8 AM 17 Good Valencia and Legacy 12/14/2023 8 AM 36 Good Victory and Tustin Ranch Rd. 12/14/2023 8 AM 39 Good Warner and Armstrong 12/14/2023 8 AM 18 Good Warner Avenue 12/14/2023 8 AM 27 Good WR Nelson Elementary 12/14/2023 8 AM 40 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Friday, December 15, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/15/2023 8 AM Matter 32 Level of Concern Good Columbus Square Park 12/15/2023 8 AM 20 Good Fire Station 21 12/15/2023 8 AM 23 Good Fire Station 28 12/15/2023 8 AM 42 Good Fire Station 37 12/15/2023 8 AM 22 Good Fire Station 6 12/15/2023 8 AM 40 Good Hangar Fenceline - E Side 12/15/2023 8 AM 23 Good Hangar Fenceline - N Center 12/15/2023 8 AM 24 Good Hangar Fenceline - N Corner 12/15/2023 8 AM 27 Good Hangar Fenceline - NE Corner 12/15/2023 8 AM 29 Good Hangar Fenceline - NE Side 12/15/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/15/2023 8 AM 33 Good Hangar Fenceline - S Side 12/15/2023 8 AM 41 Good Hangar Fenceline - SW Corner 12/15/2023 8 AM 32 Good Hangar Fenceline - SW Side 12/15/2023 8 AM 29 Good Hangar Fenceline - W Side 12/15/2023 8 AM 25 Good Heritage Elementary 12/15/2023 8 AM 29 Good Legacy Academy 12/15/2023 8 AM 24 Good Legacy Road 12/15/2023 8 AM 30 Good Moffett and Tustin Ranch 12/15/2023 8 AM 37 Good OC Animal Shelter 12/15/2023 8 AM 32 Good OCHCA 12/15/2023 8 AM 11 Good The District (Costco) 12/15/2023 8 AM 19 Good Tustin Field Services 12/15/2023 8 AM 6 Good Tustin High School 12/15/2023 8 AM 6 Good Tustin Legacy Park 12/15/2023 8 AM 22 Good Valencia and Armstrong 12/15/2023 7 AM 24 Good Valencia and Columbus Square 12/15/2023 8 AM 19 Good Valencia and Legacy 12/15/2023 8 AM 30 Good Victory and Tustin Ranch Rd. 12/15/2023 8 AM 38 Good Warner and Armstrong 12/15/2023 8 AM 21 Good Warner Avenue 12/15/2023 8 AM 32 Good WR Nelson Elementary 12/15/2023 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Saturday, December 16, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/16/2023 8 AM Matter 11 Level of Concern Good Columbus Square Park 12/16/2023 8 AM 13 Good Fire Station 21 12/16/2023 8 AM 12 Good Fire Station 28 12/16/2023 8 AM 24 Good Fire Station 37 12/16/2023 8 AM 15 Good Fire Station 6 12/16/2023 8 AM 29 Good Hangar Fenceline - E Side 12/16/2023 8 AM 15 Good Hangar Fenceline - N Center 12/16/2023 8 AM 15 Good Hangar Fenceline - N Corner 12/16/2023 8 AM 19 Good Hangar Fenceline - NE Corner 12/16/2023 8 AM 21 Good Hangar Fenceline - NE Side 12/16/2023 8 AM 7 Good Hangar Fenceline - S Corner 12/16/2023 8 AM 24 Good Hangar Fenceline - S Side 12/16/2023 8 AM 41 Good Hangar Fenceline - SW Corner 12/16/2023 8 AM 23 Good Hangar Fenceline - SW Side 12/16/2023 8 AM 22 Good Hangar Fenceline - W Side 12/16/2023 8 AM 22 Good Heritage Elementary 12/16/2023 8 AM 20 Good Legacy Academy 12/16/2023 8 AM 14 Good Legacy Road 12/16/2023 8 AM 19 Good Moffett and Tustin Ranch 12/16/2023 8 AM 18 Good OC Animal Shelter 12/16/2023 8 AM 20 Good OCHCA 12/16/2023 8 AM 4 Good The District (Costco) 12/16/2023 8 AM 5 Good Tustin Field Services 12/16/2023 8 AM 8 Good Tustin High School 12/16/2023 8 AM 2 Good Tustin Legacy Park 12/16/2023 8 AM 9 Good Valencia and Armstrong 12/16/2023 8 AM 13 Good Valencia and Columbus Square 12/16/2023 8 AM 10 Good Valencia and Legacy 12/16/2023 8 AM 21 Good Victory and Tustin Ranch Rd. 12/16/2023 8 AM 27 Good Warner and Armstrong 12/16/2023 8 AM 13 Good Warner Avenue 12/16/2023 8 AM 18 Good WR Nelson Elementary 12/16/2023 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Sunday, December 17, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy u Sensitive GrouUnhealthy Very Unhealthy ...us (0 to 54) (55 to 154) ps (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/17/2023 8 AM Matter 26 Level of Concern Good Columbus Square Park 12/17/2023 8 AM 13 Good Fire Station 21 12/17/2023 8 AM 15 Good Fire Station 28 12/17/2023 8 AM 30 Good Fire Station 37 12/17/2023 8 AM 14 Good Fire Station 6 12/17/2023 8 AM 33 Good Hangar Fenceline - E Side 12/17/2023 8 AM 16 Good Hangar Fenceline - N Center 12/17/2023 8 AM 13 Good Hangar Fenceline - N Corner 12/17/2023 8 AM 18 Good Hangar Fenceline - NE Corner 12/17/2023 8 AM 22 Good Hangar Fenceline - NE Side 12/17/2023 8 AM 7 Good Hangar Fenceline - S Corner 12/17/2023 8 AM 24 Good Hangar Fenceline - S Side 12/17/2023 8 AM 36 Good Hangar Fenceline - SW Corner 12/17/2023 8 AM 23 Good Hangar Fenceline - SW Side 12/17/2023 8 AM 19 Good Hangar Fenceline - W Side 12/17/2023 8 AM 18 Good Heritage Elementary 12/17/2023 8 AM 17 Good Legacy Academy 12/17/2023 8 AM 13 Good Legacy Road 12/17/2023 8 AM 18 Good Moffett and Tustin Ranch 12/17/2023 8 AM 21 Good OC Animal Shelter 12/17/2023 8 AM 20 Good OCHCA 12/17/2023 8 AM 8 Good The District (Costco) 12/17/2023 8 AM 6 Good Tustin Field Services 12/17/2023 8 AM 7 Good Tustin High School 12/17/2023 8 AM 3 Good Tustin Legacy Park 12/17/2023 8 AM 10 Good Valencia and Armstrong 12/17/2023 8 AM 14 Good Valencia and Columbus Square 12/17/2023 8 AM 11 Good Valencia and Legacy 12/17/2023 8 AM 19 Good Victory and Tustin Ranch Rd. 12/17/2023 8 AM 33 Good Warner and Armstrong 12/17/2023 8 AM 15 Good Warner Avenue 12/17/2023 8 AM 21 Good WR Nelson Elementary 12/17/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Monday, December 18, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/18/2023 8 AM Matter 27 Level of Concern Good Columbus Square Park 12/18/2023 8 AM 18 Good Fire Station 21 12/18/2023 8 AM 24 Good Fire Station 28 12/18/2023 8 AM 35 Good Fire Station 37 12/18/2023 8 AM 17 Good Fire Station 6 12/18/2023 8 AM 41 Good Hangar Fenceline - E Side 12/18/2023 8 AM 22 Good Hangar Fenceline - N Center 12/18/2023 8 AM 21 Good Hangar Fenceline - N Corner 12/18/2023 8 AM 26 Good Hangar Fenceline - NE Corner 12/18/2023 8 AM 18 Good Hangar Fenceline - NE Side 12/18/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/18/2023 8 AM 31 Good Hangar Fenceline - S Side 12/18/2023 8 AM 33 Good Hangar Fenceline - SW Corner 12/18/2023 8 AM 27 Good Hangar Fenceline - SW Side 12/18/2023 8 AM 28 Good Hangar Fenceline - W Side 12/18/2023 8 AM 26 Good Heritage Elementary 12/18/2023 8 AM 25 Good Legacy Academy 12/18/2023 8 AM 22 Good Legacy Road 12/18/2023 8 AM 25 Good Moffett and Tustin Ranch 12/18/2023 8 AM 35 Good OC Animal Shelter 12/18/2023 8 AM 28 Good OCHCA 12/18/2023 8 AM 9 Good The District (Costco) 12/18/2023 8 AM 14 Good Tustin Field Services 12/18/2023 8 AM 7 Good Tustin High School 12/18/2023 8 AM 7 Good Tustin Legacy Park 12/18/2023 8 AM 15 Good Valencia and Armstrong 12/18/2023 8 AM 21 Good Valencia and Columbus Square 12/18/2023 8 AM 17 Good Valencia and Legacy 12/18/2023 8 AM 26 Good Victory and Tustin Ranch Rd. 12/18/2023 8 AM 32 Good Warner and Armstrong 12/18/2023 8 AM 19 Good Warner Avenue 12/18/2023 8 AM 28 Good WR Nelson Elementary 12/18/2023 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Tuesday, December 19, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/19/2023 8 AM Matter 28 Level of Concern Good Columbus Square Park 12/19/2023 8 AM 13 Good Fire Station 21 12/19/2023 8 AM 24 Good Fire Station 28 12/19/2023 8 AM 30 Good Fire Station 37 12/19/2023 8 AM 11 Good Fire Station 6 12/19/2023 8 AM 37 Good Hangar Fenceline - E Side 12/19/2023 8 AM 14 Good Hangar Fenceline - N Center 12/19/2023 8 AM 12 Good Hangar Fenceline - N Corner 12/19/2023 8 AM 16 Good Hangar Fenceline - NE Corner 12/19/2023 8 AM 18 Good Hangar Fenceline - NE Side 12/19/2023 8 AM 7 Good Hangar Fenceline - S Corner 12/19/2023 8 AM 19 Good Hangar Fenceline - S Side 12/19/2023 8 AM 18 Good Hangar Fenceline - SW Corner 12/19/2023 8 AM 17 Good Hangar Fenceline - SW Side 12/19/2023 8 AM 17 Good Hangar Fenceline - W Side 12/19/2023 8 AM 15 Good Heritage Elementary 12/19/2023 8 AM 17 Good Legacy Academy 12/19/2023 8 AM 16 Good Legacy Road 12/19/2023 8 AM 17 Good Moffett and Tustin Ranch 12/19/2023 8 AM 21 Good OC Animal Shelter 12/19/2023 8 AM 18 Good OCHCA 12/19/2023 8 AM 7 Good The District (Costco) 12/19/2023 8 AM 7 Good Tustin Field Services 12/19/2023 7 AM 4 Good Tustin High School 12/19/2023 7 AM 3 Good Tustin Legacy Park 12/19/2023 8 AM 11 Good Valencia and Armstrong 12/19/2023 8 AM 14 Good Valencia and Columbus Square 12/19/2023 8 AM 11 Good Valencia and Legacy 12/19/2023 8 AM 18 Good Victory and Tustin Ranch Rd. 12/19/2023 8 AM 22 Good Warner and Armstrong 12/19/2023 8 AM 11 Good Warner Avenue 12/19/2023 8 AM 18 Good WR Nelson Elementary 12/19/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Wednesday, December 20, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/20/2023 8 AM Matter 10 Level of Concern Good Fire Station 37 12/20/2023 8 AM 9 Good Hangar Fenceline - E Side 12/20/2023 8 AM 10 Good Hangar Fenceline - N Center 12/20/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - NE Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - NE Side 12/20/2023 6 AM 5 Good Hangar Fenceline - S Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - S Side 12/20/2023 8 AM 12 Good Hangar Fenceline - SW Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - SW Side 12/20/2023 8 AM 13 Good Hangar Fenceline - W Side 12/20/2023 8 AM 11 Good Heritage Elementary 12/20/2023 8 AM 13 Good Legacy Academy 12/20/2023 8 AM 11 Good Legacy Road 12/20/2023 8 AM 13 Good Moffett and Tustin Ranch 12/20/2023 8 AM 15 Good OC Animal Shelter 12/20/2023 8 AM 14 Good Valencia and Armstrong 12/20/2023 7 AM 11 Good Valencia and Columbus Square 12/20/2023 8 AM 9 Good Valencia and Legacy 12/20/2023 8 AM 12 Good Victory and Tustin Ranch Rd. 12/20/2023 8 AM 14 Good Warner and Armstrong 12/20/2023 8 AM 7 Good Warner Avenue 12/20/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Friday, December 22, 2023 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/22/2023 8 AM Matter 4 Level of • Good Fire Station 37 12/22/2023 8 AM 5 Good Hangar Fenceline - E Side 12/22/2023 8 AM 5 Good Hangar Fenceline - N Center 12/22/2023 8 AM 8 Good Hangar Fenceline - N Corner 12/22/2023 8 AM 5 Good Hangar Fenceline - NE Corner 12/22/2023 8 AM 6 Good Hangar Fenceline - NE Side 12/22/2023 8 AM 6 Good Hangar Fenceline - S Corner 12/22/2023 8 AM 5 Good Hangar Fenceline - S Side 12/22/2023 8 AM 5 Good Hangar Fenceline - SW Corner 12/22/2023 8 AM 5 Good Hangar Fenceline - SW Side 12/22/2023 8 AM 6 Good Hangar Fenceline - W Side 12/22/2023 8 AM 5 Good Heritage Elementary 12/22/2023 8 AM 5 Good Legacy Academy 12/22/2023 8 AM 5 Good Legacy Road 12/22/2023 8 AM 5 Good Moffett and Tustin Ranch 12/22/2023 8 AM 8 Good OC Animal Shelter 12/22/2023 8 AM 6 Good Valencia and Armstrong 12/22/2023 7 AM 4 Good Valencia and Columbus Square 12/22/2023 8 AM 3 Good Valencia and Legacy 12/22/2023 8 AM 4 Good Victory and Tustin Ranch Rd. 12/22/2023 8 AM 8 Good Warner and Armstrong 12/22/2023 8 AM 3 Good Warner Avenue 12/22/2023 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Saturday, December 23, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/23/2023 8 AM Matter 5 Level of Concern Good Fire Station 37 12/23/2023 8 AM 6 Good Hangar Fenceline - E Side 12/23/2023 8 AM 6 Good Hangar Fenceline - N Center 12/23/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/23/2023 8 AM 7 Good Hangar Fenceline - NE Corner 12/23/2023 8 AM 8 Good Hangar Fenceline - NE Side 12/23/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/23/2023 8 AM 8 Good Hangar Fenceline - S Side 12/23/2023 8 AM 7 Good Hangar Fenceline - SW Corner 12/23/2023 8 AM 7 Good Hangar Fenceline - SW Side 12/23/2023 8 AM 8 Good Hangar Fenceline - W Side 12/23/2023 8 AM 6 Good Heritage Elementary 12/23/2023 8 AM 8 Good Legacy Academy 12/23/2023 8 AM 8 Good Legacy Road 12/23/2023 8 AM 7 Good Moffett and Tustin Ranch 12/23/2023 8 AM 11 Good OC Animal Shelter 12/23/2023 8 AM 9 Good Valencia and Armstrong 12/23/2023 7 AM 7 Good Valencia and Columbus Square 12/23/2023 8 AM 5 Good Valencia and Legacy 12/23/2023 8 AM 6 Good Victory and Tustin Ranch Rd. 12/23/2023 8 AM 9 Good Warner and Armstrong 12/23/2023 8 AM 4 Good Warner Avenue 12/23/2023 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Sunday, December 24, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/24/2023 8 AM Matter 9 Level of Concern Good Fire Station 37 12/24/2023 8 AM 8 Good Hangar Fenceline - E Side 12/24/2023 8 AM 10 Good Hangar Fenceline - N Center 12/24/2023 8 AM 14 Good Hangar Fenceline - N Corner 12/24/2023 8 AM 12 Good Hangar Fenceline - NE Corner 12/24/2023 8 AM 12 Good Hangar Fenceline - NE Side 12/24/2023 8 AM 18 Good Hangar Fenceline - S Corner 12/24/2023 8 AM 12 Good Hangar Fenceline - S Side 12/24/2023 8 AM 12 Good Hangar Fenceline - SW Corner 12/24/2023 8 AM 11 Good Hangar Fenceline - SW Side 12/24/2023 8 AM 11 Good Hangar Fenceline - W Side 12/24/2023 8 AM 9 Good Heritage Elementary 12/24/2023 8 AM 12 Good Legacy Academy 12/24/2023 8 AM 12 Good Legacy Road 12/24/2023 8 AM 13 Good Moffett and Tustin Ranch 12/24/2023 8 AM 17 Good OC Animal Shelter 12/24/2023 8 AM 14 Good Valencia and Armstrong 12/24/2023 8 AM 11 Good Valencia and Columbus Square 12/24/2023 8 AM 8 Good Valencia and Legacy 12/24/2023 8 AM 7 Good Victory and Tustin Ranch Rd. 12/24/2023 8 AM 14 Good Warner and Armstrong 12/24/2023 8 AM 7 Good Warner Avenue 12/24/2023 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Monday, December 25, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/25/2023 8 AM Matter 30 Level of Concern Good Fire Station 37 12/25/2023 8 AM 67 Moderate Hangar Fenceline - E Side 12/25/2023 8 AM 33 Good Hangar Fenceline - N Center 12/25/2023 8 AM 42 Good Hangar Fenceline - N Corner 12/25/2023 8 AM 37 Good Hangar Fenceline - NE Corner 12/25/2023 8 AM 34 Good Hangar Fenceline - NE Side 12/25/2023 8 AM 44 Good Hangar Fenceline - S Corner 12/25/2023 8 AM 36 Good Hangar Fenceline - S Side 12/25/2023 8 AM 35 Good Hangar Fenceline - SW Corner 12/25/2023 8 AM 36 Good Hangar Fenceline - SW Side 12/25/2023 8 AM 38 Good Hangar Fenceline - W Side 12/25/2023 8 AM 31 Good Heritage Elementary 12/25/2023 8 AM 38 Good Legacy Academy 12/25/2023 8 AM 36 Good Legacy Road 12/25/2023 8 AM 41 Good Moffett and Tustin Ranch 12/25/2023 8 AM 43 Good OC Animal Shelter 12/25/2023 8 AM 41 Good Valencia and Armstrong 12/25/2023 7 AM 35 Good Valencia and Columbus Square 12/25/2023 8 AM 27 Good Valencia and Legacy 12/25/2023 8 AM 23 Good Victory and Tustin Ranch Rd. 12/25/2023 8 AM 33 Good Warner and Armstrong 12/25/2023 8 AM 21 Good Warner Avenue 12/25/2023 8 AM 35 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Tuesday, December 26, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy u Sensitive GrouUnhealthy Very Unhealthy • •us (0 to 54) (55 to 154) ps (155 to 254) (255 to 354) (355 to 424) (425-504)* See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Columbus Square Park PeriodLocation 24-Hour Ending 12/26/2023 8 AM Particulate Matter • 22 Level of Concern Good Fire Station 37 12/26/2023 8 AM 26 Good Hangar Fenceline - E Side 12/26/2023 8 AM 23 Good Hangar Fenceline - N Center 12/26/2023 8 AM 30 Good Hangar Fenceline - N Corner 12/26/2023 8 AM 26 Good Hangar Fenceline - NE Corner 12/26/2023 8 AM 25 Good Hangar Fenceline - NE Side 12/26/2023 8 AM 33 Good Hangar Fenceline - S Corner 12/26/2023 8 AM 26 Good Hangar Fenceline - S Side 12/26/2023 8 AM 23 Good Hangar Fenceline - SW Corner 12/26/2023 8 AM 27 Good Hangar Fenceline - SW Side 12/26/2023 8 AM 29 Good Hangar Fenceline - W Side 12/26/2023 8 AM 22 Good Heritage Elementary 12/26/2023 8 AM 26 Good Legacy Academy 12/26/2023 8 AM 29 Good Legacy Road 12/26/2023 8 AM 29 Good Moffett and Tustin Ranch 12/26/2023 8 AM 34 Good OC Animal Shelter 12/26/2023 8 AM 29 Good Valencia and Armstrong 12/26/2023 8 AM 23 Good Valencia and Columbus Square 12/26/2023 8 AM 21 Good Valencia and Legacy 12/26/2023 8 AM 19 Good Victory and Tustin Ranch Rd. 12/26/2023 8 AM 29 Good Warner and Armstrong 12/26/2023 8 AM 19 Good Warner Avenue 12/26/2023 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 "to504 arning of emergency Maroon - conditions: ever. . likely ..- affected. Wednesday, December 27, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/27/2023 8 AM Matter 40 Level of Concern Good Fire Station 37 12/27/2023 8 AM 47 Good Hangar Fenceline - E Side 12/27/2023 8 AM 48 Good Hangar Fenceline - N Center 12/27/2023 8 AM 58 Moderate Hangar Fenceline - N Corner 12/27/2023 8 AM 53 Good Hangar Fenceline - NE Corner 12/27/2023 8 AM 52 Good Hangar Fenceline - NE Side 12/27/2023 8 AM 62 Moderate Hangar Fenceline - S Corner 12/27/2023 8 AM 53 Good Hangar Fenceline - S Side 12/27/2023 8 AM 54 Good Hangar Fenceline - SW Corner 12/27/2023 8 AM 54 Moderate Hangar Fenceline - SW Side 12/27/2023 8 AM 58 Moderate Hangar Fenceline - W Side 12/27/2023 8 AM 48 Good Heritage Elementary 12/27/2023 8 AM 52 Good Legacy Academy 12/27/2023 8 AM 58 Moderate Legacy Road 12/27/2023 8 AM 61 Moderate Moffett and Tustin Ranch 12/27/2023 8 AM 68 Moderate OC Animal Shelter 12/27/2023 8 AM 60 Moderate Valencia and Armstrong 12/27/2023 7 AM 49 Good Valencia and Columbus Square 12/27/2023 8 AM 40 Good Valencia and Legacy 12/27/2023 12 AM 38 Good Victory and Tustin Ranch Rd. 12/27/2023 8 AM 54 Moderate Warner and Armstrong 12/27/2023 8 AM 35 Good Warner Avenue 12/27/2023 8 AM 56 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Thursday, December 28, 2023 North Hangar Fire Incident I City of Tustin Aik quality updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Sensitive Groups IL(155 to 254) W Unhealthy (255 to 354) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Very Unhealthy (355 to 424) Location Columbus Square Park 24-Hour Period Ending 12/28/2023 8 AM Matter 51 Level of • Good Fire Station 37 12/28/2023 8 AM 62 Moderate Hangar Fenceline - E Side 12/28/2023 8 AM 59 Moderate Hangar Fenceline - N Center 12/28/2023 8 AM 72 Moderate Hangar Fenceline - N Corner 12/28/2023 8 AM 69 Moderate Hangar Fenceline - NE Corner 12/28/2023 8 AM 65 Moderate Hangar Fenceline - NE Side 12/28/2023 8 AM 75 Moderate Hangar Fenceline - S Corner 12/28/2023 8 AM 67 Moderate Hangar Fenceline - S Side 12/28/2023 8 AM 69 Moderate Hangar Fenceline - SW Corner 12/28/2023 8 AM 68 Moderate Hangar Fenceline - SW Side 12/28/2023 8 AM 74 Moderate Hangar Fenceline - W Side 12/28/2023 8 AM 61 Moderate Heritage Elementary 12/28/2023 8 AM 66 Moderate Legacy Academy 12/28/2023 8 AM 77 Moderate Legacy Road 12/28/2023 8 AM 71 Moderate Moffett and Tustin Ranch 12/28/2023 8 AM 84 Moderate OC Animal Shelter 12/28/2023 8 AM 74 Moderate Valencia and Armstrong 12/28/2023 8 AM 62 Moderate Valencia and Columbus Square 12/28/2023 8 AM 53 Good Valencia and Legacy 12/28/2023 8 AM 50 Good Victory and Tustin Ranch Rd. 12/28/2023 8 AM 67 Moderate Warner and Armstrong 12/28/2023 8 AM 45 Good Warner Avenue 12/28/2023 8 AM 71 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Friday, December 29, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/29/2023 8 AM Matter 58 Level of Concern Moderate Fire Station 37 12/29/2023 8 AM 63 Moderate Hangar Fenceline - E Side 12/29/2023 8 AM 63 Moderate Hangar Fenceline - N Center 12/29/2023 8 AM 76 Moderate Hangar Fenceline - N Corner 12/29/2023 8 AM 74 Moderate Hangar Fenceline - NE Corner 12/29/2023 8 AM 69 Moderate Hangar Fenceline - NE Side 12/29/2023 8 AM 79 Moderate Hangar Fenceline - S Corner 12/29/2023 8 AM 71 Moderate Hangar Fenceline - S Side 12/29/2023 8 AM 75 Moderate Hangar Fenceline - SW Corner 12/29/2023 8 AM 73 Moderate Hangar Fenceline - SW Side 12/29/2023 8 AM 78 Moderate Hangar Fenceline - W Side 12/29/2023 8 AM 65 Moderate Heritage Elementary 12/29/2023 8 AM 72 Moderate Legacy Academy 12/29/2023 8 AM 78 Moderate Legacy Road 12/29/2023 8 AM 73 Moderate Moffett and Tustin Ranch 12/29/2023 8 AM 90 Moderate OC Animal Shelter 12/29/2023 8 AM 80 Moderate Valencia and Armstrong 12/29/2023 7 AM 68 Moderate Valencia and Columbus Square 12/29/2023 8 AM 57 Moderate Valencia and Legacy 12/29/2023 8 AM 46 Good Victory and Tustin Ranch Rd. 12/29/2023 8 AM 69 Moderate Warner and Armstrong 12/29/2023 8 AM 41 Good Warner Avenue --F7 12/29/2023 8 AM 75 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is ' d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Saturday, December 30, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/30/2023 8 AM Matter 38 Level of Concern Good Fire Station 37 12/30/2023 8 AM 39 Good Hangar Fenceline - E Side 12/30/2023 8 AM 36 Good Hangar Fenceline - N Center 12/30/2023 8 AM 47 Good Hangar Fenceline - N Corner 12/30/2023 8 AM 42 Good Hangar Fenceline - NE Corner 12/30/2023 8 AM 41 Good Hangar Fenceline - NE Side 12/30/2023 8 AM 48 Good Hangar Fenceline - S Corner 12/30/2023 8 AM 38 Good Hangar Fenceline - S Side 12/30/2023 8 AM 43 Good Hangar Fenceline - SW Corner 12/30/2023 8 AM 41 Good Hangar Fenceline - SW Side 12/30/2023 8 AM 45 Good Hangar Fenceline - W Side 12/30/2023 8 AM 40 Good Heritage Elementary 12/30/2023 8 AM 44 Good Legacy Academy 12/30/2023 8 AM 46 Good Legacy Road 12/30/2023 8 AM 49 Good Moffett and Tustin Ranch 12/30/2023 8 AM 53 Good OC Animal Shelter 12/30/2023 8 AM 47 Good Valencia and Armstrong 12/30/2023 7 AM 38 Good Valencia and Columbus Square 12/30/2023 8 AM 36 Good Valencia and Legacy 12/30/2023 8 AM 28 Good Victory and Tustin Ranch Rd. 12/30/2023 8 AM 44 Good Warner and Armstrong 12/30/2023 8 AM 26 Good Warner Avenue 12/30/2023 8 AM 44 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Sunday, December 31, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/31/2023 8 AM Matter 7 Level of Concern Good Fire Station 37 12/31/2023 8 AM 7 Good Hangar Fenceline - E Side 12/31/2023 8 AM 8 Good Hangar Fenceline - N Center 12/31/2023 8 AM 10 Good Hangar Fenceline - N Corner 12/31/2023 8 AM 9 Good Hangar Fenceline - NE Corner 12/31/2023 8 AM 7 Good Hangar Fenceline - NE Side 12/31/2023 8 AM 13 Good Hangar Fenceline - S Corner 12/31/2023 8 AM 8 Good Hangar Fenceline - S Side 12/31/2023 8 AM 10 Good Hangar Fenceline - SW Corner 12/31/2023 8 AM 9 Good Hangar Fenceline - SW Side 12/31/2023 8 AM 11 Good Hangar Fenceline - W Side 12/31/2023 8 AM 8 Good Heritage Elementary 12/31/2023 8 AM 8 Good Legacy Academy 12/31/2023 8 AM 9 Good Legacy Road 12/31/2023 8 AM 10 Good Moffett and Tustin Ranch 12/31/2023 8 AM 13 Good OC Animal Shelter 12/31/2023 8 AM 10 Good Valencia and Armstrong 12/31/2023 8 AM 8 Good Valencia and Columbus Square 12/31/2023 8 AM 6 Good Valencia and Legacy 12/31/2023 8 AM 5 Good Victory and Tustin Ranch Rd. 12/31/2023 8 AM 11 Good Warner and Armstrong 12/31/2023 7 AM 3 Good Warner Avenue 12/31/2023 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Monday, January 1, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/1/2024 8 AM Matter 15 Level of Concern Good Fire Station 37 1/1/2024 8 AM 20 Good Hangar Fenceline - E Side 1/1/2024 8 AM 13 Good Hangar Fenceline - N Center 1/1/2024 8 AM 20 Good Hangar Fenceline - N Corner 1/1/2024 8 AM 17 Good Hangar Fenceline - NE Corner 1/1/2024 8 AM 16 Good Hangar Fenceline - NE Side 1/1/2024 8 AM 21 Good Hangar Fenceline - S Corner 1/1/2024 8 AM 16 Good Hangar Fenceline - S Side 1/1/2024 8 AM 16 Good Hangar Fenceline - SW Corner 1/1/2024 8 AM 16 Good Hangar Fenceline - SW Side 1/1/2024 8 AM 17 Good Hangar Fenceline - W Side 1/1/2024 8 AM 15 Good Heritage Elementary 1/1/2024 8 AM 20 Good Legacy Academy 1/1/2024 8 AM 15 Good Legacy Road 1/1/2024 8 AM 17 Good Moffett and Tustin Ranch 1/1/2024 8 AM 18 Good OC Animal Shelter 1/1/2024 8 AM 20 Good Valencia and Armstrong 1/1/2024 8 AM 17 Good Valencia and Columbus Square 1/1/2024 8 AM 14 Good Valencia and Legacy 1/1/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 1/1/2024 8 AM 14 Good Warner and Armstrong 1/1/2024 8 AM 11 Good Warner Avenue 1/1/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Tuesday, January 2, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/2/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 1/2/2024 8 AM 11 Good Hangar Fenceline - E Side 1/2/2024 8 AM 12 Good Hangar Fenceline - N Center 1/2/2024 8 AM 11 Good Hangar Fenceline - N Corner 1/2/2024 8 AM 10 Good Hangar Fenceline - NE Corner 1/2/2024 8 AM 11 Good Hangar Fenceline - NE Side 1/2/2024 8 AM 17 Good Hangar Fenceline - S Corner 1/2/2024 8 AM 11 Good Hangar Fenceline - S Side 1/2/2024 8 AM 10 Good Hangar Fenceline - SW Corner 1/2/2024 8 AM 11 Good Hangar Fenceline - SW Side 1/2/2024 8 AM 12 Good Hangar Fenceline - W Side 1/2/2024 8 AM 7 Good Heritage Elementary 1/2/2024 8 AM 12 Good Legacy Academy 1/2/2024 8 AM 10 Good Legacy Road 1/2/2024 8 AM 12 Good Moffett and Tustin Ranch 1/2/2024 8 AM 15 Good OC Animal Shelter 1/2/2024 8 AM 11 Good Valencia and Armstrong 1/2/2024 7 AM 9 Good Valencia and Columbus Square 1/2/2024 8 AM 9 Good Valencia and Legacy 1/2/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 1/2/2024 8 AM 12 Good Warner and Armstrong 1/2/2024 8 AM 8 Good Warner Avenue 1/2/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Wednesday, January 3, 2024 North Hangar Fire Incident I City of Tustin Aik quality updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/3/2024 8 AM Matter 11 Level of • Good Fire Station 37 1/3/2024 8 AM 14 Good Hangar Fenceline - E Side 1/3/2024 8 AM 14 Good Hangar Fenceline - N Center 1/3/2024 8 AM 16 Good Hangar Fenceline - N Corner 1/3/2024 8 AM 14 Good Hangar Fenceline - NE Corner 1/3/2024 8 AM 14 Good Hangar Fenceline - NE Side 1/3/2024 8 AM 20 Good Hangar Fenceline - S Corner 1/3/2024 8 AM 14 Good Hangar Fenceline - S Side 1/3/2024 8 AM 13 Good Hangar Fenceline - SW Corner 1/3/2024 8 AM 15 Good Hangar Fenceline - SW Side 1/3/2024 8 AM 14 Good Hangar Fenceline - W Side 1/3/2024 7 AM 11 Good Heritage Elementary 1/3/2024 8 AM 13 Good Legacy Academy 1/3/2024 8 AM 15 Good Legacy Road 1/3/2024 8 AM 15 Good Moffett and Tustin Ranch 1/3/2024 8 AM 21 Good OC Animal Shelter 1/3/2024 8 AM 16 Good Valencia and Armstrong 1/3/2024 7 AM 12 Good Valencia and Columbus Square 1/3/2024 7 AM 10 Good Valencia and Legacy 1/3/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 1/3/2024 8 AM 15 Good Warner and Armstrong 1/3/2024 4 AM 10 Good Warner Avenue 1/3/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Thursday, January 4, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/4/2024 8 AM Matter 5 Level of • Good Fire Station 37 1/4/2024 8 AM 6 Good Hangar Fenceline - E Side 1/4/2024 8 AM 6 Good Hangar Fenceline - N Center 1/4/2024 8 AM 6 Good Hangar Fenceline - N Corner 1/4/2024 8 AM 6 Good Hangar Fenceline - NE Corner 1/4/2024 8 AM 7 Good Hangar Fenceline - NE Side 1/4/2024 8 AM 7 Good Hangar Fenceline - S Corner 1/4/2024 8 AM 6 Good Hangar Fenceline - S Side 1/4/2024 8 AM 7 Good Hangar Fenceline - SW Corner 1/4/2024 7 AM 6 Good Hangar Fenceline - SW Side 1/4/2024 8 AM 8 Good Hangar Fenceline - W Side 1/4/2024 8 AM 7 Good Heritage Elementary 1/4/2024 8 AM 10 Good Legacy Academy 1/4/2024 8 AM 6 Good Legacy Road 1/4/2024 8 AM 7 Good Moffett and Tustin Ranch 1/4/2024 8 AM 9 Good OC Animal Shelter 1/4/2024 8 AM 8 Good Valencia and Armstrong 1/4/2024 7 AM 6 Good Valencia and Columbus Square 1/4/2024 8 AM 4 Good Valencia and Legacy 1/4/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 1/4/2024 8 AM 7 Good Warner and Armstrong 1/4/2024 8 AM 3 Good Warner Avenue 1/4/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Friday, January 5, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Sensitive Groups IL(155 to 254) W Unhealthy (255 to 354) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Very Unhealthy (355 to 424) Location Columbus Square Park 24-Hour Period Ending 1/5/2024 8 AM Matter 7 Level of • Good Fire Station 37 1/5/2024 8 AM 10 Good Hangar Fenceline - E Side 1/5/2024 8 AM 7 Good Hangar Fenceline - N Center 1/5/2024 8 AM 9 Good Hangar Fenceline - N Corner 1/5/2024 8 AM 9 Good Hangar Fenceline - NE Corner 1/5/2024 8 AM 8 Good Hangar Fenceline - NE Side 1/5/2024 8 AM 11 Good Hangar Fenceline - S Corner 1/5/2024 8 AM 8 Good Hangar Fenceline - S Side 1/5/2024 8 AM 10 Good Hangar Fenceline - SW Corner 1/5/2024 7 AM 8 Good Hangar Fenceline - SW Side 1/5/2024 8 AM 8 Good Hangar Fenceline - W Side 1/5/2024 8 AM 8 Good Heritage Elementary 1/5/2024 8 AM 10 Good Legacy Academy 1/5/2024 8 AM 9 Good Legacy Road 1/5/2024 8 AM 10 Good Moffett and Tustin Ranch 1/5/2024 8 AM 15 Good OC Animal Shelter 1/5/2024 8 AM 11 Good Valencia and Armstrong 1/5/2024 7 AM 7 Good Valencia and Columbus Square 1/5/2024 8 AM 7 Good Valencia and Legacy 1/5/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 1/5/2024 8 AM 10 Good Warner and Armstrong 1/5/2024 8 AM 7 Good Warner Avenue 1/5/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Saturday, January 6, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/6/2024 8 AM Matter 14 Level of • Good Fire Station 37 1/6/2024 8 AM 18 Good Hangar Fenceline - E Side 1/6/2024 8 AM 18 Good Hangar Fenceline - N Center 1/6/2024 8 AM 22 Good Hangar Fenceline - N Corner 1/6/2024 8 AM 20 Good Hangar Fenceline - NE Corner 1/6/2024 8 AM 17 Good Hangar Fenceline - NE Side 1/6/2024 8 AM 19 Good Hangar Fenceline - S Corner 1/6/2024 8 AM 18 Good Hangar Fenceline - S Side 1/6/2024 8 AM 20 Good Hangar Fenceline - SW Corner 1/6/2024 8 AM 19 Good Hangar Fenceline - SW Side 1/6/2024 8 AM 23 Good Hangar Fenceline - W Side 1/6/2024 8 AM 19 Good Heritage Elementary 1/6/2024 8 AM 19 Good Legacy Academy 1/6/2024 8 AM 20 Good Legacy Road 1/6/2024 8 AM 21 Good Moffett and Tustin Ranch 1/6/2024 8 AM 30 Good OC Animal Shelter 1/6/2024 8 AM 22 Good Valencia and Armstrong 1/6/2024 8 AM 17 Good Valencia and Columbus Square 1/6/2024 8 AM 16 Good Valencia and Legacy 1/6/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 1/6/2024 8 AM 24 Good Warner and Armstrong 1/6/2024 8 AM 12 Good Warner Avenue 1/6/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Sunday, January 7, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/7/2024 8 AM Matter 8 Level of • Good Fire Station 37 1/7/2024 8 AM 9 Good Hangar Fenceline - E Side 1/7/2024 8 AM 7 Good Hangar Fenceline - N Center 1/7/2024 8 AM 9 Good Hangar Fenceline - N Corner 1/7/2024 8 AM 8 Good Hangar Fenceline - NE Corner 1/7/2024 8 AM 8 Good Hangar Fenceline - NE Side 1/7/2024 8 AM 10 Good Hangar Fenceline - S Corner 1/7/2024 8 AM 7 Good Hangar Fenceline - S Side 1/7/2024 8 AM 10 Good Hangar Fenceline - SW Corner 1/7/2024 8 AM 8 Good Hangar Fenceline - SW Side 1/7/2024 8 AM 9 Good Hangar Fenceline - W Side 1/7/2024 8 AM 9 Good Heritage Elementary 1/7/2024 8 AM 8 Good Legacy Academy 1/7/2024 8 AM 9 Good Legacy Road 1/7/2024 8 AM 10 Good Moffett and Tustin Ranch 1/7/2024 8 AM 16 Good OC Animal Shelter 1/7/2024 8 AM 10 Good Valencia and Armstrong 1/7/2024 8 AM 6 Good Valencia and Columbus Square 1/7/2024 8 AM 7 Good Valencia and Legacy 1/7/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 1/7/2024 8 AM 13 Good Warner and Armstrong 1/7/2024 8 AM 5 Good Warner Avenue 1/7/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Monday, January 8, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/8/2024 8 AM Matter 5 Level of • Good Fire Station 37 1/8/2024 8 AM 6 Good Hangar Fenceline - E Side 1/8/2024 8 AM 6 Good Hangar Fenceline - N Center 1/8/2024 8 AM 7 Good Hangar Fenceline - N Corner 1/8/2024 8 AM 6 Good Hangar Fenceline - NE Corner 1/8/2024 8 AM 5 Good Hangar Fenceline - NE Side 1/8/2024 7 AM 4 Good Hangar Fenceline - S Corner 1/8/2024 8 AM 5 Good Hangar Fenceline - S Side 1/8/2024 8 AM 7 Good Hangar Fenceline - SW Corner 1/8/2024 8 AM 6 Good Hangar Fenceline - SW Side 1/8/2024 8 AM 8 Good Hangar Fenceline - W Side 1/8/2024 8 AM 6 Good Heritage Elementary 1/8/2024 8 AM 6 Good Legacy Academy 1/8/2024 7 AM 6 Good Legacy Road 1/8/2024 8 AM 6 Good Moffett and Tustin Ranch 1/8/2024 8 AM 7 Good OC Animal Shelter 1/8/2024 8 AM 7 Good Valencia and Armstrong 1/8/2024 7 AM 6 Good Valencia and Columbus Square 1/8/2024 8 AM 5 Good Valencia and Legacy 1/8/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 1/8/2024 8 AM 7 Good Warner and Armstrong 1/8/2024 8 AM 5 Good Warner Avenue 1/8/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Tuesday, January 9, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/9/2024 8 AM Matter 5 Level of • Good Fire Station 37 1/9/2024 8 AM 6 Good Hangar Fenceline - E Side 1/9/2024 8 AM 7 Good Hangar Fenceline - N Center 1/9/2024 8 AM 6 Good Hangar Fenceline - N Corner 1/9/2024 8 AM 6 Good Hangar Fenceline - NE Corner 1/9/2024 8 AM 7 Good Hangar Fenceline - NE Side 1/9/2024 8 AM 7 Good Hangar Fenceline - S Corner 1/9/2024 8 AM 9 Good Hangar Fenceline - S Side 1/9/2024 8 AM 6 Good Hangar Fenceline - SW Corner 1/9/2024 7 AM 7 Good Hangar Fenceline - SW Side 1/9/2024 8 AM 6 Good Hangar Fenceline - W Side 1/9/2024 8 AM 6 Good Heritage Elementary 1/9/2024 8 AM 7 Good Legacy Academy 1/9/2024 8 AM 6 Good Legacy Road 1/9/2024 8 AM 6 Good Moffett and Tustin Ranch 1/9/2024 8 AM 10 Good OC Animal Shelter 1/9/2024 8 AM 8 Good Valencia and Armstrong 1/9/2024 7 AM 7 Good Valencia and Columbus Square 1/9/2024 8 AM 5 Good Valencia and Legacy 1/9/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 1/9/2024 8 AM 9 Good Warner and Armstrong 1/9/2024 8 AM 4 Good Warner Avenue 1/9/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Wednesday, January 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy u Sensitive GrouUnhealthy Very Unhealthy • •us (0 to 54) (55 to 154) ps (155 to 254) (255 to 354) (355 to 424) (425-504)* See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Columbus Square Park PeriodLocation 24-Hour Ending 1/10/2024 8 AM Particulate Matter • 6 Level of Concern Good Fire Station 37 1/10/2024 8 AM 8 Good Hangar Fenceline - E Side 1/10/2024 8 AM 7 Good Hangar Fenceline - N Center 1/10/2024 8 AM 8 Good Hangar Fenceline - N Corner 1/10/2024 8 AM 8 Good Hangar Fenceline - NE Corner 1/10/2024 8 AM 7 Good Hangar Fenceline - NE Side 1/10/2024 8 AM 9 Good Hangar Fenceline - S Corner 1/10/2024 8 AM 9 Good Hangar Fenceline - S Side 1/10/2024 8 AM 10 Good Hangar Fenceline - SW Corner 1/10/2024 8 AM 7 Good Hangar Fenceline - SW Side 1/10/2024 8 AM 8 Good Hangar Fenceline - W Side 1/10/2024 8 AM 9 Good Heritage Elementary ** ** ** Legacy Academy 1/10/2024 8 AM 9 Good Legacy Road 1/10/2024 8 AM 8 Good Moffett and Tustin Ranch 1/10/2024 8 AM 14 Good OC Animal Shelter 1/10/2024 8 AM 10 Good Valencia and Armstrong 1/10/2024 8 AM S Good Valencia and Columbus Square 1/10/2024 8 AM 4 Good Valencia and Legacy 1/10/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 1/10/2024 8 AM 12 Good Warner and Armstrong 1/10/2024 8 AM 6 Good Warner Avenue 1/10/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Thursday, January 11, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) 155 to 254) �( See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/11/2024 8 AM Matter 9 Level of • Good Fire Station 37 1/11/2024 8 AM 7 Good Hangar Fenceline - E Side 1/11/2024 8 AM 9 Good Hangar Fenceline - N Center 1/11/2024 8 AM 10 Good Hangar Fenceline - N Corner 1/11/2024 8 AM 9 Good Hangar Fenceline - NE Corner 1/11/2024 8 AM 11 Good Hangar Fenceline - NE Side 1/11/2024 8 AM 15 Good Hangar Fenceline - S Corner 1/11/2024 8 AM 11 Good Hangar Fenceline - S Side 1/11/2024 8 AM 13 Good Hangar Fenceline - SW Corner 1/11/2024 8 AM 10 Good Hangar Fenceline - SW Side 1/11/2024 8 AM 10 Good Hangar Fenceline - W Side 1/11/2024 8 AM 11 Good Heritage Elementary 1/11/2024 8 AM 9 Good Legacy Academy 1/11/2024 8 AM 11 Good Legacy Road 1/11/2024 8 AM 10 Good Moffett and Tustin Ranch 1/11/2024 8 AM 17 Good OC Animal Shelter 1/11/2024 8 AM 13 Good Valencia and Armstrong 1/11/2024 8 AM 8 Good Valencia and Columbus Square 1/11/2024 8 AM 8 Good Valencia and Legacy 1/11/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 1/11/2024 8 AM 13 Good Warner and Armstrong 1/11/2024 8 AM 5 Good Warner Avenue 1/11/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Friday, January 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy u Sensitive GrouUnhealthy Very Unhealthy • •us (0 to 54) (55 to 154) ps (155 to 254) (255 to 354) (355 to 424) (425-504)* See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Columbus Square Park PeriodLocation 24-Hour Ending 1/12/2024 8 AM Particulate Matter • 4 Level of Concern Good Fire Station 37 1/12/2024 8 AM 5 Good Hangar Fenceline - E Side 1/12/2024 8 AM 6 Good Hangar Fenceline - N Center 1/12/2024 8 AM 6 Good Hangar Fenceline - N Corner 1/12/2024 8 AM 5 Good Hangar Fenceline - NE Corner 1/12/2024 8 AM 7 Good Hangar Fenceline - NE Side 1/12/2024 8 AM 8 Good Hangar Fenceline - S Corner 1/12/2024 8 AM 7 Good Hangar Fenceline - S Side 1/12/2024 8 AM 8 Good Hangar Fenceline - SW Corner 1/12/2024 8 AM 6 Good Hangar Fenceline - SW Side 1/12/2024 8 AM 5 Good Hangar Fenceline - W Side 1/12/2024 8 AM 5 Good Heritage Elementary 1/12/2024 8 AM 6 Good Legacy Academy 1/12/2024 8 AM 6 Good Legacy Road 1/12/2024 8 AM 6 Good Moffett and Tustin Ranch 1/12/2024 8 AM 8 Good OC Animal Shelter 1/12/2024 8 AM 8 Good Valencia and Armstrong 1/12/2024 8 AM 5 Good Valencia and Columbus Square 1/12/2024 8 AM 4 Good Valencia and Legacy 1/12/2024 8 AM 6 Good Victory and Tustin Ranch Rd. 1/12/2024 8 AM 9 Good Warner and Armstrong 1/12/2024 8 AM 3 Good Warner Avenue 1/12/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 "to504 arning of emergency Maroon - conditions: ever. . likely ..- affected. Saturday, January 13, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/13/2024 8 AM Matter 7 Level of • Good Fire Station 37 1/13/2024 8 AM 9 Good Hangar Fenceline - E Side 1/13/2024 8 AM 7 Good Hangar Fenceline - N Center 1/13/2024 8 AM 9 Good Hangar Fenceline - N Corner 1/13/2024 8 AM 8 Good Hangar Fenceline - NE Corner 1/13/2024 8 AM 8 Good Hangar Fenceline - NE Side 1/13/2024 8 AM 9 Good Hangar Fenceline - S Corner 1/13/2024 8 AM 9 Good Hangar Fenceline - S Side 1/13/2024 8 AM 11 Good Hangar Fenceline - SW Corner 1/13/2024 8 AM 8 Good Hangar Fenceline - SW Side 1/13/2024 8 AM 8 Good Hangar Fenceline - W Side 1/13/2024 8 AM 8 Good Heritage Elementary 1/13/2024 8 AM 8 Good Legacy Academy 1/13/2024 8 AM 9 Good Legacy Road 1/13/2024 8 AM 7 Good Moffett and Tustin Ranch 1/13/2024 8 AM 13 Good OC Animal Shelter 1/13/2024 8 AM 13 Good Valencia and Armstrong 1/13/2024 8 AM 7 Good Valencia and Columbus Square 1/13/2024 8 AM 6 Good Valencia and Legacy 1/13/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 1/13/2024 8 AM 12 Good Warner and Armstrong 1/13/2024 8 AM 6 Good Warner Avenue 1/13/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Sunday, January 14, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) 155 to 254) �( See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/14/2024 8 AM Matter 9 Level of • Good Fire Station 37 1/14/2024 8 AM 12 Good Hangar Fenceline - E Side 1/14/2024 8 AM 14 Good Hangar Fenceline - N Center 1/14/2024 8 AM 15 Good Hangar Fenceline - N Corner 1/14/2024 8 AM 14 Good Hangar Fenceline - NE Corner 1/14/2024 8 AM 13 Good Hangar Fenceline - NE Side 1/14/2024 8 AM 16 Good Hangar Fenceline - S Corner 1/14/2024 8 AM 15 Good Hangar Fenceline - S Side 1/14/2024 8 AM 17 Good Hangar Fenceline - SW Corner 1/14/2024 8 AM 15 Good Hangar Fenceline - SW Side 1/14/2024 8 AM 15 Good Hangar Fenceline - W Side 1/14/2024 8 AM 14 Good Heritage Elementary 1/14/2024 8 AM 12 Good Legacy Academy 1/14/2024 8 AM 16 Good Legacy Road 1/14/2024 8 AM 15 Good Moffett and Tustin Ranch 1/14/2024 8 AM 22 Good OC Animal Shelter 1/14/2024 8 AM 16 Good Valencia and Armstrong 1/14/2024 8 AM 10 Good Valencia and Columbus Square 1/14/2024 8 AM 10 Good Valencia and Legacy 1/14/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 1/14/2024 8 AM 18 Good Warner and Armstrong 1/14/2024 8 AM 13 Good Warner Avenue 1/14/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Monday, January 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/15/2024 8 AM Matter 13 Level of Concern Good Fire Station 37 1/15/2024 8 AM 15 Good Hangar Fenceline - E Side 1/15/2024 8 AM 15 Good Hangar Fenceline - N Center 1/15/2024 8 AM 18 Good Hangar Fenceline - N Corner 1/15/2024 8 AM 15 Good Hangar Fenceline - NE Corner 1/15/2024 8 AM 15 Good Hangar Fenceline - NE Side 1/15/2024 8 AM 16 Good Hangar Fenceline - S Corner 1/15/2024 8 AM 17 Good Hangar Fenceline - S Side 1/15/2024 8 AM 18 Good Hangar Fenceline - SW Corner 1/15/2024 8 AM 17 Good Hangar Fenceline - SW Side 1/15/2024 8 AM 18 Good Hangar Fenceline - W Side 1/15/2024 8 AM 16 Good Heritage Elementary 1/15/2024 8 AM 15 Good Legacy Academy 1/15/2024 8 AM 16 Good Legacy Road 1/15/2024 8 AM 18 Good Moffett and Tustin Ranch 1/15/2024 8 AM 23 Good OC Animal Shelter 1/15/2024 8 AM 18 Good Valencia and Armstrong 1/15/2024 8 AM 13 Good Valencia and Columbus Square 1/15/2024 8 AM 15 Good Valencia and Legacy 1/15/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 1/15/2024 8 AM 18 Good Warner and Armstrong 1/15/2024 8 AM 12 Good Warner Avenue 1/15/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Tuesday, January 16, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/16/2024 8 AM Matter 33 Level of • Good Fire Station 37 1/16/2024 8 AM 42 Good Hangar Fenceline - E Side 1/16/2024 8 AM 44 Good Hangar Fenceline - N Center 1/16/2024 8 AM 49 Good Hangar Fenceline - N Corner 1/16/2024 8 AM 43 Good Hangar Fenceline - NE Corner 1/16/2024 8 AM 41 Good Hangar Fenceline - NE Side 1/16/2024 8 AM 47 Good Hangar Fenceline - S Corner 1/16/2024 8 AM 47 Good Hangar Fenceline - S Side 1/16/2024 8 AM 49 Good Hangar Fenceline - SW Corner 1/16/2024 8 AM 47 Good Hangar Fenceline - SW Side 1/16/2024 8 AM 49 Good Hangar Fenceline - W Side 1/16/2024 8 AM 43 Good Heritage Elementary 1/16/2024 8 AM 40 Good Legacy Academy 1/16/2024 8 AM 49 Good Legacy Road 1/16/2024 8 AM 51 Good Moffett and Tustin Ranch 1/16/2024 8 AM 66 Moderate OC Animal Shelter 1/16/2024 8 AM 48 Good Valencia and Armstrong 1/16/2024 8 AM 36 Good Valencia and Columbus Square 1/16/2024 8 AM 35 Good Valencia and Legacy 1/16/2024 8 AM 49 Good Victory and Tustin Ranch Rd. 1/16/2024 8 AM 51 Good Warner and Armstrong 1/16/2024 8 AM 30 Good Warner Avenue 1/16/2024 8 AM 52 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Wednesday, January 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) Columbus Square Park PeriodLocation 24-Hour Ending 1/17/2024 8 AM Particulate Matter 55 Level of Concern Moderate Fire Station 37 1/17/2024 8 AM 64 Moderate Hangar Fenceline - E Side 1/17/2024 8 AM 66 Moderate Hangar Fenceline - N Center 1/17/2024 8 AM 74 Moderate Hangar Fenceline - N Corner 1/17/2024 8 AM 67 Moderate Hangar Fenceline - NE Corner 1/17/2024 8 AM 65 Moderate Hangar Fenceline - NE Side 1/17/2024 8 AM 70 Moderate Hangar Fenceline - S Corner 1/17/2024 8 AM 69 Moderate Hangar Fenceline - S Side 1/17/2024 8 AM 72 Moderate Hangar Fenceline - SW Corner 1/17/2024 8 AM 72 Moderate Hangar Fenceline - SW Side 1/17/2024 8 AM 73 Moderate Hangar Fenceline - W Side 1/17/2024 8 AM 63 Moderate Heritage Elementary 1/17/2024 8 AM 64 Moderate Legacy Academy 1/17/2024 8 AM 75 Moderate Legacy Road 1/17/2024 8 AM 73 Moderate Moffett and Tustin Ranch 1/17/2024 8 AM 87 Moderate OC Animal Shelter 1/17/2024 8 AM 75 Moderate Valencia and Armstrong 1/17/2024 8 AM 59 Moderate Valencia and Columbus Square 1/17/2024 8 AM 55 Moderate Valencia and Legacy 1/17/2024 8 AM 73 Moderate Victory and Tustin Ranch Rd. 1/17/2024 8 AM 73 Moderate Warner and Armstrong 1/17/2024 8 AM 51 Good Warner Avenue 1/17/2024 8 AM 74 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy Health alert: The risk of health "W*FIM veryone. Maroon Hazardous 425 to 504 Health warning of emergen=cy conditions: ever•ne is more likely to be affected. Thursday, January 18, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 1/18/2024 8 AM Matter 27 Level of • Good Fire Station 37 1/18/2024 8 AM 30 Good Hangar Fenceline - E Side 1/18/2024 8 AM 28 Good Hangar Fenceline - N Center 1/18/2024 8 AM 33 Good Hangar Fenceline - N Corner 1/18/2024 8 AM 29 Good Hangar Fenceline - NE Corner 1/18/2024 8 AM 29 Good Hangar Fenceline - NE Side 1/18/2024 8 AM 31 Good Hangar Fenceline - S Corner 1/18/2024 8 AM 31 Good Hangar Fenceline - S Side 1/18/2024 8 AM 32 Good Hangar Fenceline - SW Corner 1/18/2024 8 AM 29 Good Hangar Fenceline - SW Side 1/18/2024 8 AM 33 Good Hangar Fenceline - W Side 1/18/2024 8 AM 29 Good Heritage Elementary 1/18/2024 8 AM 28 Good Legacy Academy 1/18/2024 8 AM 32 Good Legacy Road 1/18/2024 8 AM 36 Good Moffett and Tustin Ranch 1/18/2024 8 AM 37 Good OC Animal Shelter 1/18/2024 8 AM 34 Good Valencia and Armstrong 1/18/2024 8 AM 26 Good Valencia and Columbus Square 1/18/2024 8 AM 23 Good Valencia and Legacy 1/18/2024 8 AM 34 Good Victory and Tustin Ranch Rd. 1/18/2024 8 AM 32 Good Warner and Armstrong 1/18/2024 8 AM 22 Good Warner Avenue 1/18/2024 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Friday, January 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/19/2024 8 AM Particulate Matter 15 Level of Concern Good Fire Station 37 1/19/2024 8 AM 16 Good Hangar Fenceline - E Side 1/19/2024 8 AM 18 Good Hangar Fenceline - N Center 1/19/2024 8 AM 19 Good Hangar Fenceline - N Corner 1/19/2024 8 AM 17 Good Hangar Fenceline - NE Corner 1/19/2024 8 AM 18 Good Hangar Fenceline - NE Side 1/19/2024 8 AM 19 Good Hangar Fenceline - S Corner 1/19/2024 8 AM 20 Good Hangar Fenceline - S Side 1/19/2024 8 AM 20 Good Hangar Fenceline - SW Corner 1/19/2024 8 AM 18 Good Hangar Fenceline - SW Side 1/19/2024 8 AM 19 Good Hangar Fenceline - W Side 1/19/2024 8 AM 18 Good Heritage Elementary 1/19/2024 8 AM 17 Good Legacy Academy 1/19/2024 8 AM 20 Good Legacy Road 1/19/2024 8 AM 19 Good Moffett and Tustin Ranch 1/19/2024 8 AM 24 Good OC Animal Shelter 1/19/2024 8 AM 19 Good Valencia and Armstrong 1/19/2024 8 AM 15 Good Valencia and Columbus Square 1/19/2024 8 AM 13 Good Valencia and Legacy 1/19/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 1/19/2024 8 AM 20 Good Warner and Armstrong 1/19/2024 8 AM 15 Good Warner Avenue 1/19/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely . •- -• Saturday, January 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups EL(155 to 254) (255 to 354) (355 to 424) See below for further category descriptions. Columbus Square Park PeriodLocation 24-Hour Ending 1/20/2024 8 AM Particulate Matter 34 Level of Concern Good Fire Station 37 1/20/2024 8 AM 34 Good Hangar Fenceline - E Side 1/20/2024 8 AM 38 Good Hangar Fenceline - N Center 1/20/2024 8 AM 44 Good Hangar Fenceline - N Corner 1/20/2024 8 AM 40 Good Hangar Fenceline - NE Corner 1/20/2024 8 AM 38 Good Hangar Fenceline - NE Side 1/20/2024 8 AM 41 Good Hangar Fenceline - S Corner 1/20/2024 8 AM 41 Good Hangar Fenceline - S Side 1/20/2024 8 AM 44 Good Hangar Fenceline - SW Corner 1/20/2024 8 AM 39 Good Hangar Fenceline - SW Side 1/20/2024 8 AM 45 Good Hangar Fenceline - W Side 1/20/2024 8 AM 37 Good Heritage Elementary 1/20/2024 8 AM 38 Good Legacy Academy 1/20/2024 8 AM 44 Good Legacy Road 1/20/2024 8 AM 40 Good Moffett and Tustin Ranch 1/20/2024 8 AM 50 Good OC Animal Shelter 1/20/2024 8 AM 44 Good Valencia and Armstrong 1/20/2024 8 AM 35 Good Valencia and Columbus Square 1/20/2024 8 AM 31 Good Valencia and Legacy 1/20/2024 8 AM 43 Good Victory and Tustin Ranch Rd. 1/20/2024 8 AM 39 Good Warner and Armstrong 1/20/2024 8 AM 32 Good Warner Avenue 1/20/2024 8 AM 43 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely . •- -• Sunday, January 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/21/2024 8 AM Particulate Matter 8 Level of Concern Good Fire Station 37 1/21/2024 8 AM 8 Good Hangar Fenceline - E Side 1/21/2024 8 AM 9 Good Hangar Fenceline - N Center 1/21/2024 8 AM 10 Good Hangar Fenceline - N Corner 1/21/2024 8 AM 9 Good Hangar Fenceline - NE Corner 1/21/2024 8 AM 9 Good Hangar Fenceline - NE Side 1/21/2024 8 AM 8 Good Hangar Fenceline - S Corner 1/21/2024 8 AM 9 Good Hangar Fenceline - S Side 1/21/2024 8 AM 9 Good Hangar Fenceline - SW Corner 1/21/2024 8 AM 9 Good Hangar Fenceline - SW Side 1/21/2024 8 AM 11 Good Hangar Fenceline - W Side 1/21/2024 8 AM 8 Good Heritage Elementary 1/21/2024 8 AM 8 Good Legacy Academy 1/21/2024 8 AM 9 Good Legacy Road 1/21/2024 8 AM 10 Good Moffett and Tustin Ranch 1/21/2024 8 AM 12 Good OC Animal Shelter 1/21/2024 8 AM 11 Good Valencia and Armstrong 1/21/2024 8 AM 8 Good Valencia and Columbus Square 1/21/2024 8 AM 7 Good Valencia and Legacy 1/21/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 1/21/2024 8 AM 10 Good Warner and Armstrong 1/21/2024 8 AM 6 Good Warner Avenue 1/21/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely • •- -• Monday, January 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/22/2024 8 AM Particulate Matter 4 Level of Concern Good Fire Station 37 1/22/2024 8 AM 4 Good Hangar Fenceline - E Side 1/22/2024 8 AM 4 Good Hangar Fenceline - N Center 1/22/2024 8 AM 4 Good Hangar Fenceline - N Corner 1/22/2024 8 AM 4 Good Hangar Fenceline - NE Corner 1/22/2024 8 AM 6 Good Hangar Fenceline - NE Side 1/22/2024 8 AM 5 Good Hangar Fenceline - S Corner 1/22/2024 8 AM 6 Good Hangar Fenceline - S Side 1/22/2024 8 AM 6 Good Hangar Fenceline - SW Corner 1/22/2024 8 AM 5 Good Hangar Fenceline - SW Side 1/22/2024 8 AM 5 Good Hangar Fenceline - W Side 1/22/2024 8 AM 6 Good Heritage Elementary 1/22/2024 8 AM 4 Good Legacy Academy 1/22/2024 8 AM 5 Good Legacy Road 1/22/2024 8 AM 5 Good Moffett and Tustin Ranch 1/22/2024 8 AM 8 Good OC Animal Shelter 1/22/2024 8 AM 7 Good Valencia and Armstrong 1/22/2024 8 AM 3 Good Valencia and Columbus Square 1/22/2024 8 AM 3 Good Valencia and Legacy 1/22/2024 8 AM 6 Good Victory and Tustin Ranch Rd. 1/22/2024 8 AM 7 Good Warner and Armstrong 1/22/2024 8 AM 4 Good Warner Avenue 1/22/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely • •- -• Tuesday, January 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/23/2024 8 AM Particulate Matter 11 Level of Concern Good Fire Station 37 1/23/2024 8 AM 12 Good Hangar Fenceline - E Side 1/23/2024 8 AM 13 Good Hangar Fenceline - N Center 1/23/2024 8 AM 15 Good Hangar Fenceline - N Corner 1/23/2024 8 AM 14 Good Hangar Fenceline - NE Corner 1/23/2024 8 AM 14 Good Hangar Fenceline - NE Side 1/23/2024 8 AM 15 Good Hangar Fenceline - S Corner 1/23/2024 8 AM 15 Good Hangar Fenceline - S Side 1/23/2024 8 AM 14 Good Hangar Fenceline - SW Corner 1/23/2024 8 AM 14 Good Hangar Fenceline - SW Side 1/23/2024 8 AM 16 Good Hangar Fenceline - W Side 1/23/2024 8 AM 14 Good Heritage Elementary 1/23/2024 8 AM 14 Good Legacy Academy 1/23/2024 8 AM 16 Good Legacy Road 1/23/2024 8 AM 17 Good Moffett and Tustin Ranch 1/23/2024 8 AM 26 Good OC Animal Shelter 1/23/2024 8 AM 19 Good Valencia and Armstrong 1/23/2024 8 AM 12 Good Valencia and Columbus Square 1/23/2024 8 AM 10 Good Valencia and Legacy 1/23/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 1/23/2024 8 AM 16 Good Warner and Armstrong 1/23/2024 8 AM 10 Good Warner Avenue 1/23/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely . •- -• Wednesday, January 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/24/2024 8 AM Particulate Matter 8 Level of Concern Good Fire Station 37 1/24/2024 8 AM 6 Good Hangar Fenceline - E Side 1/24/2024 8 AM 9 Good Hangar Fenceline - N Center 1/24/2024 8 AM 10 Good Hangar Fenceline - N Corner 1/24/2024 8 AM 9 Good Hangar Fenceline - NE Corner 1/24/2024 8 AM 10 Good Hangar Fenceline - NE Side 1/24/2024 8 AM 10 Good Hangar Fenceline - S Corner 1/24/2024 8 AM 10 Good Hangar Fenceline - S Side 1/24/2024 8 AM 11 Good Hangar Fenceline - SW Corner 1/24/2024 8 AM 10 Good Hangar Fenceline - SW Side 1/24/2024 8 AM 9 Good Hangar Fenceline - W Side 1/24/2024 8 AM 10 Good Heritage Elementary 1/24/2024 8 AM 9 Good Legacy Academy 1/24/2024 8 AM 11 Good Legacy Road 1/24/2024 8 AM 10 Good Moffett and Tustin Ranch 1/24/2024 8 AM 6 Good OC Animal Shelter 1/24/2024 8 AM 12 Good Valencia and Armstrong 1/24/2024 8 AM 8 Good Valencia and Columbus Square 1/24/2024 8 AM 8 Good Valencia and Legacy 1/24/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 1/24/2024 8 AM 14 Good Warner and Armstrong 1/24/2024 8 AM 8 Good Warner Avenue 1/24/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely • •- -• Thursday, January 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/25/2024 8 AM Particulate Matter 9 Level of Concern Good Fire Station 37 1/25/2024 8 AM 9 Good Hangar Fenceline - E Side 1/25/2024 8 AM 11 Good Hangar Fenceline - N Center 1/25/2024 8 AM 13 Good Hangar Fenceline - N Corner 1/25/2024 8 AM 12 Good Hangar Fenceline - NE Corner 1/25/2024 8 AM 12 Good Hangar Fenceline - NE Side 1/25/2024 8 AM 13 Good Hangar Fenceline - S Corner 1/25/2024 8 AM 12 Good Hangar Fenceline - S Side 1/25/2024 8 AM 13 Good Hangar Fenceline - SW Corner 1/25/2024 8 AM 12 Good Hangar Fenceline - SW Side 1/25/2024 8 AM 14 Good Hangar Fenceline - W Side 1/25/2024 8 AM 13 Good Heritage Elementary 1/25/2024 8 AM 11 Good Legacy Academy 1/25/2024 8 AM 14 Good Legacy Road 1/25/2024 8 AM 13 Good Moffett and Tustin Ranch 1/25/2024 8 AM 19 Good OC Animal Shelter 1/25/2024 8 AM 15 Good Valencia and Armstrong 1/25/2024 8 AM 8 Good Valencia and Columbus Square 1/25/2024 8 AM 13 Good Valencia and Legacy 1/2S/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 1/25/2024 8 AM 16 Good Warner and Armstrong 1/25/2024 8 AM 8 Good Warner Avenue 1/25/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely • •- -• Friday, January 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/26/2024 8 AM Particulate Matter 7 Level of Concern Good Fire Station 37 1/26/2024 8 AM 7 Good Hangar Fenceline - E Side 1/26/2024 8 AM 8 Good Hangar Fenceline - N Center 1/26/2024 8 AM 9 Good Hangar Fenceline - N Corner 1/26/2024 8 AM 7 Good Hangar Fenceline - NE Corner 1/26/2024 8 AM 8 Good Hangar Fenceline - NE Side 1/26/2024 8 AM 8 Good Hangar Fenceline - S Corner 1/26/2024 8 AM 9 Good Hangar Fenceline - S Side 1/26/2024 8 AM 10 Good Hangar Fenceline - SW Corner 1/26/2024 8 AM 9 Good Hangar Fenceline - SW Side 1/26/2024 8 AM 9 Good Hangar Fenceline - W Side 1/26/2024 8 AM 9 Good Heritage Elementary 1/26/2024 8 AM 8 Good Legacy Academy 1/26/2024 8 AM 9 Good Legacy Road 1/26/2024 8 AM 8 Good Moffett and Tustin Ranch 1/26/2024 8 AM 12 Good OC Animal Shelter 1/26/2024 8 AM 11 Good Valencia and Armstrong 1/26/2024 8 AM 7 Good Valencia and Columbus Square 1/26/2024 8 AM 7 Good Valencia and Legacy 1/26/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 1/26/2024 8 AM 13 Good Warner and Armstrong 1/26/2024 8 AM 6 Good Warner Avenue 1/26/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely • •- -• Saturday, January 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 1/27/2024 8 AM Particulate Matter 18 Level of Concern Good Fire Station 37 1/27/2024 8 AM 19 Good Hangar Fenceline - E Side 1/27/2024 8 AM 21 Good Hangar Fenceline - N Center 1/27/2024 8 AM 24 Good Hangar Fenceline - N Corner 1/27/2024 8 AM 22 Good Hangar Fenceline - NE Corner 1/27/2024 8 AM 22 Good Hangar Fenceline - NE Side 1/27/2024 8 AM 23 Good Hangar Fenceline - S Corner 1/27/2024 8 AM 24 Good Hangar Fenceline - S Side 1/27/2024 8 AM 26 Good Hangar Fenceline - SW Corner 1/27/2024 8 AM 23 Good Hangar Fenceline - SW Side 1/27/2024 8 AM 23 Good Hangar Fenceline - W Side 1/27/2024 8 AM 25 Good Heritage Elementary 1/27/2024 8 AM 21 Good Legacy Academy 1/27/2024 8 AM 26 Good Legacy Road 1/27/2024 8 AM 24 Good Moffett and Tustin Ranch 1/27/2024 8 AM 32 Good OC Animal Shelter 1/27/2024 8 AM 30 Good Valencia and Armstrong 1/27/2024 8 AM 19 Good Valencia and Columbus Square 1/27/2024 8 AM 20 Good Valencia and Legacy 1/27/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 1/27/2024 8 AM 28 Good Warner and Armstrong 1/27/2024 8 AM 24 Good Warner Avenue 1/27/2024 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: • • -likely • •- -• Sunday, January 28, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 1/28/2024 8 AM Matter 6 Level of • Good Fire Station 37 1/28/2024 8 AM 8 Good Hangar Fenceline - E Side 1/28/2024 8 AM 9 Good Hangar Fenceline - N Center 1/28/2024 8 AM 9 Good Hangar Fenceline - N Corner 1/28/2024 8 AM 7 Good Hangar Fenceline - NE Corner 1/28/2024 8 AM 9 Good Hangar Fenceline - NE Side 1/28/2024 8 AM 9 Good Hangar Fenceline - S Corner 1/28/2024 8 AM 10 Good Hangar Fenceline - S Side 1/28/2024 8 AM 10 Good Hangar Fenceline - SW Corner 1/28/2024 8 AM 8 Good Hangar Fenceline - SW Side 1/28/2024 8 AM 14 Good Hangar Fenceline - W Side 1/28/2024 8 AM 8 Good Heritage Elementary 1/28/2024 8 AM 7 Good Legacy Academy 1/28/2024 8 AM 8 Good Legacy Road 1/28/2024 8 AM 8 Good Moffett and Tustin Ranch 1/28/2024 8 AM 12 Good OC Animal Shelter 1/28/2024 8 AM 9 Good Valencia and Armstrong 1/28/2024 8 AM 7 Good Valencia and Columbus Square ** ** ** Valencia and Legacy 1/28/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 1/28/2024 8 AM 10 Good Warner and Armstrong 1/28/2024 8 AM 6 Good Warner Avenue 1/28/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Monday, January 29, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 1/29/2024 8 AM Matter 7 Level of • Good Fire Station 37 1/29/2024 8 AM 9 Good Hangar Fenceline - E Side 1/29/2024 8 AM 8 Good Hangar Fenceline - N Center 1/29/2024 8 AM 9 Good Hangar Fenceline - N Corner 1/29/2024 8 AM 7 Good Hangar Fenceline - NE Corner 1/29/2024 8 AM 8 Good Hangar Fenceline - NE Side 1/29/2024 8 AM 9 Good Hangar Fenceline - S Corner 1/29/2024 8 AM 31 Good Hangar Fenceline - S Side 1/29/2024 8 AM 11 Good Hangar Fenceline - SW Corner 1/29/2024 8 AM 7 Good Hangar Fenceline - SW Side 1/29/2024 8 AM 12 Good Hangar Fenceline - W Side 1/29/2024 8 AM 6 Good Heritage Elementary 1/29/2024 8 AM 8 Good Legacy Academy 1/29/2024 8 AM 9 Good Legacy Road 1/29/2024 8 AM 8 Good Moffett and Tustin Ranch 1/29/2024 8 AM 12 Good OC Animal Shelter ** ** ** Valencia and Armstrong 1/29/2024 8 AM 6 Good Valencia and Columbus Square 1/29/2024 8 AM 8 Good Valencia and Legacy 1/29/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 1/29/2024 8 AM 10 Good Warner and Armstrong 1/29/2024 8 AM 5 Good Warner Avenue 1/29/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Tuesday, January 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 1/30/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 1/30/2024 8 AM 10 Good Hangar Fenceline - E Side 1/30/2024 8 AM 10 Good Hangar Fenceline - N Center 1/30/2024 8 AM 10 Good Hangar Fenceline - N Corner 1/30/2024 8 AM 10 Good Hangar Fenceline - NE Corner 1/30/2024 8 AM 10 Good Hangar Fenceline - NE Side 1/30/2024 8 AM 13 Good Hangar Fenceline - S Corner 1/30/2024 8 AM 16 Good Hangar Fenceline - S Side 1/30/2024 8 AM 15 Good Hangar Fenceline - SW Corner 1/30/2024 8 AM 10 Good Hangar Fenceline - SW Side 1/30/2024 8 AM 10 Good Hangar Fenceline - W Side 1/30/2024 8 AM 10 Good Heritage Elementary 1/30/2024 8 AM 10 Good Legacy Academy 1/30/2024 8 AM 11 Good Legacy Road 1/30/2024 8 AM 11 Good Moffett and Tustin Ranch 1/30/2024 8 AM 18 Good OC Animal Shelter 1/30/2024 8 AM 13 Good Valencia and Armstrong 1/30/2024 8 AM 8 Good Valencia and Columbus Square 1/30/2024 8 AM 8 Good Valencia and Legacy 1/30/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 1/30/2024 8 AM 16 Good Warner and Armstrong 1/30/2024 8 AM 10 Good Warner Avenue 1/30/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Wednesday, January 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 1/31/2024 8 AM Matter 12 Level of Concern Good Fire Station 37 1/31/2024 8 AM 13 Good Hangar Fenceline - E Side 1/31/2024 8 AM 16 Good Hangar Fenceline - N Center 1/31/2024 8 AM 16 Good Hangar Fenceline - N Corner 1/31/2024 8 AM 15 Good Hangar Fenceline - NE Corner 1/31/2024 8 AM 15 Good Hangar Fenceline - NE Side 1/31/2024 8 AM 20 Good Hangar Fenceline - S Corner 1/31/2024 8 AM 19 Good Hangar Fenceline - S Side 1/31/2024 8 AM 21 Good Hangar Fenceline - SW Corner 1/31/2024 8 AM 17 Good Hangar Fenceline - SW Side 1/31/2024 8 AM 18 Good Hangar Fenceline - W Side 1/31/2024 8 AM 16 Good Heritage Elementary 1/31/2024 8 AM 14 Good Legacy Academy 1/31/2024 8 AM 18 Good Legacy Road 1/31/2024 8 AM 17 Good Moffett and Tustin Ranch 1/31/2024 8 AM 25 Good OC Animal Shelter 1/31/2024 8 AM 19 Good Valencia and Armstrong 1/31/2024 8 AM 14 Good Valencia and Columbus Square 1/31/2024 8 AM 12 Good Valencia and Legacy 1/31/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 1/31/2024 8 AM 23 Good Warner and Armstrong 1/31/2024 8 AM 18 Good Warner Avenue 1/31/2024 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Thursday, February 1, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/1/2024 8 AM Matter 16 Level of Concern Good Fire Station 37 2/1/2024 8 AM 15 Good Hangar Fenceline - E Side 2/1/2024 8 AM 17 Good Hangar Fenceline - N Center 2/1/2024 8 AM 20 Good Hangar Fenceline - N Corner 2/1/2024 8 AM 18 Good Hangar Fenceline - NE Corner 2/1/2024 8 AM 17 Good Hangar Fenceline - NE Side 2/1/2024 8 AM 18 Good Hangar Fenceline - S Corner ** ** ** Hangar Fenceline - S Side 2/1/2024 8 AM 22 Good Hangar Fenceline - SW Corner 2/1/2024 8 AM 18 Good Hangar Fenceline - SW Side 2/1/2024 8 AM 18 Good Hangar Fenceline - W Side 2/1/2024 8 AM 17 Good Heritage Elementary 2/1/2024 8 AM 18 Good Legacy Academy 2/1/2024 8 AM 21 Good Legacy Road 2/1/2024 8 AM 23 Good Moffett and Tustin Ranch 2/1/2024 8 AM 25 Good OC Animal Shelter 2/1/2024 8 AM 21 Good Valencia and Armstrong 2/1/2024 8 AM 17 Good Valencia and Columbus Square 2/1/2024 8 AM 17 Good Valencia and Legacy 2/1/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 2/1/2024 8 AM 22 Good Warner and Armstrong 2/1/2024 8 AM 19 Good Warner Avenue 2/1/2024 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Friday, February 2, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/2/2024 8 AM Matter 7 Level of • Good Fire Station 37 2/2/2024 8 AM 7 Good Hangar Fenceline - E Side 2/2/2024 8 AM 8 Good Hangar Fenceline - N Center 2/2/2024 8 AM 9 Good Hangar Fenceline - N Corner 2/2/2024 8 AM 9 Good Hangar Fenceline - NE Corner 2/2/2024 8 AM 8 Good Hangar Fenceline - NE Side 2/2/2024 8 AM 10 Good Hangar Fenceline - S Corner 2/2/2024 8 AM 15 Good Hangar Fenceline - S Side 2/2/2024 8 AM 9 Good Hangar Fenceline - SW Corner 2/2/2024 8 AM 8 Good Hangar Fenceline - SW Side 2/2/2024 8 AM 10 Good Hangar Fenceline - W Side 2/2/2024 8 AM 8 Good Heritage Elementary 2/2/2024 1 AM 8 Good Legacy Academy 2/2/2024 8 AM 9 Good Legacy Road 2/2/2024 8 AM 10 Good Moffett and Tustin Ranch 2/2/2024 8 AM 12 Good OC Animal Shelter 2/2/2024 8 AM 10 Good Valencia and Armstrong 2/2/2024 8 AM 7 Good Valencia and Columbus Square 2/2/2024 8 AM 7 Good Valencia and Legacy 2/2/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 2/2/2024 8 AM 11 Good Warner and Armstrong 2/2/2024 8 AM 7 Good Warner Avenue 2/2/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Saturday, February 3, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/3/2024 8 AM Matter 5 Level of • Good Fire Station 37 2/3/2024 8 AM 5 Good Hangar Fenceline - E Side 2/3/2024 8 AM 5 Good Hangar Fenceline - N Center 2/3/2024 8 AM 5 Good Hangar Fenceline - N Corner 2/3/2024 8 AM 5 Good Hangar Fenceline - NE Corner 2/3/2024 8 AM 5 Good Hangar Fenceline - NE Side 2/3/2024 8 AM 6 Good Hangar Fenceline - S Corner 2/3/2024 8 AM 5 Good Hangar Fenceline - S Side 2/3/2024 8 AM 8 Good Hangar Fenceline - SW Corner 2/3/2024 8 AM 5 Good Hangar Fenceline - SW Side 2/3/2024 8 AM 7 Good Hangar Fenceline - W Side 2/3/2024 8 AM 5 Good Heritage Elementary 2/3/2024 8 AM 6 Good Legacy Academy 2/3/2024 8 AM 6 Good Legacy Road 2/3/2024 8 AM 5 Good Moffett and Tustin Ranch 2/3/2024 8 AM 7 Good OC Animal Shelter 2/3/2024 8 AM 7 Good Valencia and Armstrong 2/3/2024 8 AM 4 Good Valencia and Columbus Square 2/3/2024 8 AM 5 Good Valencia and Legacy 2/3/2024 8 AM 6 Good Victory and Tustin Ranch Rd. 2/3/2024 8 AM 10 Good Warner and Armstrong 2/3/2024 8 AM 2 Good Warner Avenue 2/3/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Sunday, February 4, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/4/2024 8 AM Matter 4 Level of • Good Fire Station 37 2/4/2024 8 AM 4 Good Hangar Fenceline - E Side 2/4/2024 8 AM 4 Good Hangar Fenceline - N Center 2/4/2024 8 AM 4 Good Hangar Fenceline - N Corner 2/4/2024 8 AM 5 Good Hangar Fenceline - NE Corner 2/4/2024 8 AM 4 Good Hangar Fenceline - NE Side 2/4/2024 8 AM 5 Good Hangar Fenceline - S Corner 2/4/2024 8 AM 4 Good Hangar Fenceline - S Side 2/4/2024 8 AM 7 Good Hangar Fenceline - SW Corner 2/4/2024 8 AM 4 Good Hangar Fenceline - SW Side 2/4/2024 8 AM 10 Good Hangar Fenceline - W Side 2/4/2024 8 AM 4 Good Heritage Elementary 2/4/2024 8 AM 4 Good Legacy Academy 2/4/2024 8 AM 3 Good Legacy Road 2/4/2024 8 AM 5 Good Moffett and Tustin Ranch 2/4/2024 8 AM 6 Good OC Animal Shelter 2/4/2024 8 AM 6 Good Valencia and Armstrong 2/4/2024 8 AM 4 Good Valencia and Columbus Square 2/4/2024 8 AM 3 Good Valencia and Legacy 2/4/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 2/4/2024 8 AM 7 Good Warner and Armstrong 2/4/2024 8 AM 3 Good Warner Avenue 2/4/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Monday, February 5, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very UnhealthyHazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 2/5/2024 8 AM Particulate Matter 3 Level of Concern Good Fire Station 37 2/5/2024 8 AM 3 Good Hangar Fenceline - E Side 2/5/2024 8 AM 3 Good Hangar Fenceline - N Center 2/5/2024 8 AM 4 Good Hangar Fenceline - N Corner 2/5/2024 8 AM 4 Good Hangar Fenceline - NE Corner 2/5/2024 8 AM 4 Good Hangar Fenceline - NE Side 2/5/2024 8 AM 4 Good Hangar Fenceline - S Corner 2/5/2024 8 AM 3 Good Hangar Fenceline - S Side 2/5/2024 8 AM 5 Good Hangar Fenceline - SW Corner 2/5/2024 8 AM 4 Good Hangar Fenceline - SW Side 2/5/2024 8 AM 5 Good Hangar Fenceline - W Side 2/5/2024 8 AM 4 Good Heritage Elementary 2/5/2024 8 AM 3 Good Legacy Academy 2/5/2024 8 AM 4 Good Legacy Road 2/5/2024 8 AM 4 Good Moffett and Tustin Ranch 2/5/2024 8 AM 5 Good OC Animal Shelter 2/5/2024 8 AM 5 Good Valencia and Armstrong 2/5/2024 8 AM 3 Good Valencia and Columbus Square 2/5/2024 8 AM 3 Good Valencia and Legacy 2/5/2024 8 AM 4 Good Victory and Tustin Ranch Rd. 2/5/2024 8 AM 6 Good Warner and Armstrong 2/5/2024 3 AM 3 Good Warner Avenue 2/5/2024 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 "to504 arning of emergency Maroon - conditions: ever. . likely ..- affected. Tuesday, February 6, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/6/2024 8 AM Matter 3 Level of • Good Fire Station 37 2/6/2024 8 AM 17 Good Hangar Fenceline - E Side 2/6/2024 8 AM 4 Good Hangar Fenceline - N Center 2/6/2024 8 AM 4 Good Hangar Fenceline - N Corner 2/6/2024 8 AM 4 Good Hangar Fenceline - NE Corner 2/6/2024 8 AM 4 Good Hangar Fenceline - NE Side 2/6/2024 8 AM 4 Good Hangar Fenceline - S Corner 2/6/2024 8 AM 4 Good Hangar Fenceline - S Side 2/6/2024 8 AM 4 Good Hangar Fenceline - SW Corner 2/6/2024 8 AM 4 Good Hangar Fenceline - SW Side 2/6/2024 8 AM 5 Good Hangar Fenceline - W Side 2/6/2024 8 AM 4 Good Heritage Elementary 2/6/2024 8 AM 4 Good Legacy Academy 2/6/2024 8 AM 5 Good Legacy Road 2/6/2024 8 AM 5 Good Moffett and Tustin Ranch 2/6/2024 8 AM 7 Good OC Animal Shelter 2/6/2024 8 AM 4 Good Valencia and Armstrong 2/6/2024 8 AM 4 Good Valencia and Columbus Square 2/6/2024 8 AM 4 Good Valencia and Legacy 2/6/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 2/6/2024 8 AM 6 Good Warner and Armstrong 2/6/2024 8 AM 5 Good Warner Avenue 2/6/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Wednesday, February 7, 2024 North Hangar Fire Incident I City of Tustin Aik quality updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/7/2024 8 AM Matter 4 Level of • Good Fire Station 37 2/7/2024 8 AM 4 Good Hangar Fenceline - E Side 2/7/2024 8 AM 5 Good Hangar Fenceline - N Center 2/7/2024 8 AM 5 Good Hangar Fenceline - N Corner 2/7/2024 8 AM 4 Good Hangar Fenceline - NE Corner 2/7/2024 8 AM 5 Good Hangar Fenceline - NE Side 2/7/2024 8 AM 5 Good Hangar Fenceline - S Corner 2/7/2024 8 AM 4 Good Hangar Fenceline - S Side 2/7/2024 8 AM 5 Good Hangar Fenceline - SW Corner 2/7/2024 8 AM 5 Good Hangar Fenceline - SW Side 2/7/2024 8 AM 5 Good Hangar Fenceline - W Side 2/7/2024 8 AM 5 Good Heritage Elementary 2/7/2024 8 AM 5 Good Legacy Academy 2/7/2024 8 AM 5 Good Legacy Road 2/7/2024 8 AM 5 Good Moffett and Tustin Ranch 2/7/2024 8 AM 7 Good OC Animal Shelter 2/7/2024 8 AM 6 Good Valencia and Armstrong 2/7/2024 8 AM 5 Good Valencia and Columbus Square 2/7/2024 8 AM 4 Good Valencia and Legacy 2/7/2024 8 AM 6 Good Victory and Tustin Ranch Rd. 2/7/2024 8 AM 6 Good Warner and Armstrong 2/7/2024 8 AM 4 Good Warner Avenue 2/7/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Thursday, February 8, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/8/2024 8 AM Matter 4 Level of • Good Fire Station 37 2/8/2024 8 AM 4 Good Hangar Fenceline - E Side 2/8/2024 8 AM 4 Good Hangar Fenceline - N Center 2/8/2024 8 AM 5 Good Hangar Fenceline - N Corner 2/8/2024 8 AM 5 Good Hangar Fenceline - NE Corner 2/8/2024 8 AM 5 Good Hangar Fenceline - NE Side 2/8/2024 8 AM 5 Good Hangar Fenceline - S Corner 2/8/2024 8 AM 4 Good Hangar Fenceline - S Side 2/8/2024 8 AM 6 Good Hangar Fenceline - SW Corner 2/8/2024 8 AM 4 Good Hangar Fenceline - SW Side 2/8/2024 8 AM 5 Good Hangar Fenceline - W Side 2/8/2024 8 AM 4 Good Heritage Elementary 2/8/2024 8 AM 5 Good Legacy Academy 2/8/2024 8 AM 5 Good Legacy Road 2/8/2024 8 AM 4 Good Moffett and Tustin Ranch 2/8/2024 8 AM 7 Good OC Animal Shelter 2/8/2024 8 AM 7 Good Valencia and Armstrong 2/8/2024 8 AM 3 Good Valencia and Columbus Square 2/8/2024 8 AM 3 Good Valencia and Legacy 2/8/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 2/8/2024 8 AM 8 Good Warner and Armstrong 2/8/2024 8 AM 2 Good Warner Avenue 2/8/2024 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Friday, February 9, 2024 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 2/9/2024 8 AM Matter 3 Level of • Good Fire Station 37 2/9/2024 8 AM 5 Good Hangar Fenceline - E Side 2/9/2024 8 AM 3 Good Hangar Fenceline - N Center 2/9/2024 8 AM 3 Good Hangar Fenceline - N Corner 2/9/2024 8 AM 4 Good Hangar Fenceline - NE Corner 2/9/2024 8 AM 4 Good Hangar Fenceline - NE Side 2/9/2024 8 AM 3 Good Hangar Fenceline - S Corner 2/9/2024 8 AM 2 Good Hangar Fenceline - S Side 2/9/2024 8 AM 5 Good Hangar Fenceline - SW Corner 2/9/2024 8 AM 3 Good Hangar Fenceline - SW Side 2/9/2024 8 AM 4 Good Hangar Fenceline - W Side 2/9/2024 8 AM 4 Good Heritage Elementary 2/9/2024 8 AM 4 Good Legacy Academy 2/9/2024 8 AM 5 Good Legacy Road 2/9/2024 8 AM 3 Good Moffett and Tustin Ranch 2/9/2024 8 AM 5 Good OC Animal Shelter 2/9/2024 8 AM 5 Good Valencia and Armstrong 2/9/2024 8 AM 3 Good Valencia and Columbus Square 2/9/2024 8 AM 2 Good Valencia and Legacy 2/9/2024 8 AM 4 Good Victory and Tustin Ranch Rd. 2/9/2024 8 AM 6 Good Warner and Armstrong 2/9/2024 8 AM 2 Good Warner Avenue 2/9/2024 8 AM 2 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Saturday, February 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/10/2024 8 AM Matter • 6 Level of Concern Good Fire Station 37 2/10/2024 8 AM 7 Good Hangar Fenceline - E Side 2/10/2024 8 AM 9 Good Hangar Fenceline - N Center 2/10/2024 8 AM 8 Good Hangar Fenceline - N Corner 2/10/2024 8 AM 7 Good Hangar Fenceline - NE Corner 2/10/2024 8 AM 8 Good Hangar Fenceline - NE Side 2/10/2024 8 AM 7 Good Hangar Fenceline - S Corner 2/10/2024 8 AM 6 Good Hangar Fenceline - S Side 2/10/2024 8 AM 8 Good Hangar Fenceline - SW Corner 2/10/2024 8 AM 7 Good Hangar Fenceline - SW Side 2/10/2024 8 AM 10 Good Hangar Fenceline - W Side 2/10/2024 8 AM 7 Good Heritage Elementary 2/10/2024 8 AM 7 Good Legacy Academy 2/10/2024 8 AM 8 Good Legacy Road 2/10/2024 8 AM 8 Good Moffett and Tustin Ranch 2/10/2024 2 AM 7 Good OC Animal Shelter 2/10/2024 8 AM 8 Good Valencia and Armstrong 2/10/2024 8AM 7 Good Valencia and Columbus Square 2/10/2024 8 AM 5 Good Valencia and Legacy 2/10/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 2/10/2024 8 AM 9 Good Warner and Armstrong 2/10/2024 8 AM 4 Good Warner Avenue 2/10/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Sunday, February 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/11/2024 8 AM Matter • 8 Level of Concern Good Fire Station 37 2/11/2024 8 AM 8 Good Hangar Fenceline - E Side 2/11/2024 8 AM 8 Good Hangar Fenceline - N Center 2/11/2024 8 AM 8 Good Hangar Fenceline - N Corner 2/11/2024 8 AM 10 Good Hangar Fenceline - NE Corner 2/11/2024 8 AM 9 Good Hangar Fenceline - NE Side 2/11/2024 8 AM 11 Good Hangar Fenceline - S Corner 2/11/2024 8 AM 10 Good Hangar Fenceline - S Side 2/11/2024 8 AM 8 Good Hangar Fenceline - SW Corner 2/11/2024 8 AM 7 Good Hangar Fenceline - SW Side 2/11/2024 8 AM 8 Good Hangar Fenceline - W Side 2/11/2024 8 AM 7 Good Heritage Elementary 2/11/2024 8 AM 11 Good Legacy Academy 2/11/2024 8 AM 8 Good Legacy Road 2/11/2024 8 AM 10 Good Moffett and Tustin Ranch 2/11/2024 8 AM 5 Good OC Animal Shelter 2/11/2024 8 AM 5 Good Valencia and Armstrong 2/11/2024 8AM 7 Good Valencia and Columbus Square 2/11/2024 8 AM 3 Good Valencia and Legacy 2/11/2024 8AM 9 Good Victory and Tustin Ranch Rd. 2/11/2024 8 AM 10 Good Warner and Armstrong 2/11/2024 8AM 9 Good Warner Avenue 2/11/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Monday, February 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/12/2024 8 AM Matter • 7 Level of Concern Good Fire Station 37 2/12/2024 8 AM 7 Good Hangar Fenceline - E Side 2/12/2024 8 AM 7 Good Hangar Fenceline - N Center 2/12/2024 8 AM 8 Good Hangar Fenceline - N Corner 2/12/2024 8 AM 11 Good Hangar Fenceline - NE Corner 2/12/2024 8 AM 7 Good Hangar Fenceline - NE Side 2/12/2024 8 AM 10 Good Hangar Fenceline - S Corner 2/12/2024 8 AM 7 Good Hangar Fenceline - S Side 2/12/2024 8 AM 5 Good Hangar Fenceline - SW Corner 2/12/2024 8 AM 7 Good Hangar Fenceline - SW Side 2/12/2024 8 AM 7 Good Hangar Fenceline - W Side 2/12/2024 8 AM 5 Good Heritage Elementary 2/12/2024 8 AM 8 Good Legacy Academy 2/12/2024 8 AM 8 Good Legacy Road 2/12/2024 8 AM 10 Good Moffett and Tustin Ranch 2/12/2024 8 AM 4 Good OC Animal Shelter 2/12/2024 8 AM 5 Good Valencia and Armstrong 2/12/2024 8AM 7 Good Valencia and Columbus Square 2/12/2024 8 AM 3 Good Valencia and Legacy 2/12/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 2/12/2024 8 AM 9 Good Warner and Armstrong 2/12/2024 8 AM 12 Good Warner Avenue 2/12/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Tuesday, February 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/13/2024 8 AM Matter • 10 Level of Concern Good Fire Station 37 2/13/2024 8 AM 10 Good Hangar Fenceline - E Side 2/13/2024 8 AM 9 Good Hangar Fenceline - N Center 2/13/2024 8 AM 10 Good Hangar Fenceline - N Corner 2/13/2024 8 AM 14 Good Hangar Fenceline - NE Corner 2/13/2024 8 AM 9 Good Hangar Fenceline - NE Side 2/13/2024 8 AM 8 Good Hangar Fenceline - S Corner 2/13/2024 8 AM 8 Good Hangar Fenceline - S Side 2/13/2024 8 AM 10 Good Hangar Fenceline - SW Corner 2/13/2024 8 AM 9 Good Hangar Fenceline - SW Side 2/13/2024 8 AM 9 Good Hangar Fenceline - W Side 2/13/2024 8 AM 7 Good Heritage Elementary 2/13/2024 8 AM 12 Good Legacy Academy 2/13/2024 8 AM 10 Good Legacy Road 2/13/2024 8 AM 14 Good Moffett and Tustin Ranch 2/13/2024 8 AM 8 Good OC Animal Shelter 2/13/2024 8 AM 7 Good Valencia and Armstrong 2/13/2024 8AM 8 Good Valencia and Columbus Square 2/13/2024 8 AM 5 Good Valencia and Legacy 2/13/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 2/13/2024 8 AM 13 Good Warner and Armstrong 2/13/2024 8 AM 9 Good Warner Avenue 2/13/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Wednesday, February 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/14/2024 8 AM Matter • 8 Level of Concern Good Fire Station 37 2/14/2024 8 AM 10 Good Hangar Fenceline - E Side 2/14/2024 8 AM 9 Good Hangar Fenceline - N Center 2/14/2024 8 AM 8 Good Hangar Fenceline - N Corner 2/14/2024 8 AM 10 Good Hangar Fenceline - NE Corner 2/14/2024 8 AM 10 Good Hangar Fenceline - NE Side 2/14/2024 8 AM 13 Good Hangar Fenceline - S Corner 2/14/2024 8 AM 10 Good Hangar Fenceline - S Side 2/14/2024 8 AM 14 Good Hangar Fenceline - SW Corner 2/14/2024 8 AM 9 Good Hangar Fenceline - SW Side 2/14/2024 8 AM 10 Good Hangar Fenceline - W Side 2/14/2024 8 AM 9 Good Heritage Elementary 2/14/2024 8 AM 9 Good Legacy Academy 2/14/2024 8 AM 13 Good Legacy Road 2/14/2024 8 AM 9 Good Moffett and Tustin Ranch 2/14/2024 8 AM 3 Good OC Animal Shelter 2/14/2024 8 AM 12 Good Valencia and Armstrong 2/14/2024 8AM 9 Good Valencia and Columbus Square 2/14/2024 8 AM 7 Good Valencia and Legacy 2/14/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 2/14/2024 8 AM 13 Good Warner and Armstrong 2/14/2024 8 AM 7 Good Warner Avenue 2/14/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Thursday, February 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/15/2024 8 AM Matter • 9 Level of Concern Good Fire Station 37 2/15/2024 8 AM 11 Good Hangar Fenceline - E Side 2/15/2024 8 AM 11 Good Hangar Fenceline - N Center 2/15/2024 8 AM 10 Good Hangar Fenceline - N Corner 2/15/2024 8 AM 11 Good Hangar Fenceline - NE Corner 2/15/2024 8 AM 11 Good Hangar Fenceline - NE Side 2/15/2024 8 AM 11 Good Hangar Fenceline - S Corner 2/15/2024 8 AM 12 Good Hangar Fenceline - S Side 2/15/2024 8 AM 16 Good Hangar Fenceline - SW Corner 2/15/2024 8 AM 12 Good Hangar Fenceline - SW Side 2/15/2024 8 AM 10 Good Hangar Fenceline - W Side 2/15/2024 8 AM 10 Good Heritage Elementary 2/15/2024 8 AM 10 Good Legacy Academy 2/15/2024 8 AM 14 Good Legacy Road 2/15/2024 8 AM 12 Good Moffett and Tustin Ranch 2/15/2024 8 AM 9 Good OC Animal Shelter 2/15/2024 8 AM 14 Good Valencia and Armstrong 2/15/2024 8 AM 10 Good Valencia and Columbus Square 2/15/2024 8 AM 8 Good Valencia and Legacy 2/15/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 2/15/2024 8 AM 15 Good Warner and Armstrong 2/15/2024 8 AM 9 Good Warner Avenue 2/15/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Friday, February 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/16/2024 8 AM Matter • 15 Level of Concern Good Fire Station 37 2/16/2024 8 AM 16 Good Hangar Fenceline - E Side 2/16/2024 8 AM 17 Good Hangar Fenceline - N Center 2/16/2024 8 AM 15 Good Hangar Fenceline - N Corner 2/16/2024 8 AM 17 Good Hangar Fenceline - NE Corner 2/16/2024 8 AM 18 Good Hangar Fenceline - NE Side 2/16/2024 8 AM 18 Good Hangar Fenceline - S Corner 2/16/2024 8 AM 17 Good Hangar Fenceline - S Side 2/16/2024 8 AM 22 Good Hangar Fenceline - SW Corner 2/16/2024 8 AM 17 Good Hangar Fenceline - SW Side 2/16/2024 8 AM 18 Good Hangar Fenceline - W Side 2/16/2024 8 AM 16 Good Heritage Elementary 2/16/2024 8 AM 17 Good Legacy Academy 2/16/2024 8 AM 22 Good Legacy Road 2/16/2024 8 AM 18 Good Moffett and Tustin Ranch 2/16/2024 8 AM 22 Good OC Animal Shelter 2/16/2024 8 AM 19 Good Valencia and Armstrong 2/16/2024 8 AM 15 Good Valencia and Columbus Square 2/16/2024 8 AM 15 Good Valencia and Legacy 2/16/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 2/16/2024 8 AM 20 Good Warner and Armstrong 2/16/2024 8 AM 17 Good Warner Avenue 2/16/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Saturday, February 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/17/2024 8 AM Matter 32 Level of Concern Good Fire Station 37 2/17/2024 8 AM 30 Good Hangar Fenceline - E Side 2/17/2024 8 AM 37 Good Hangar Fenceline - N Center 2/17/2024 8 AM 31 Good Hangar Fenceline - N Corner 2/17/2024 8 AM 37 Good Hangar Fenceline - NE Corner 2/17/2024 8 AM 35 Good Hangar Fenceline - NE Side 2/17/2024 8 AM 36 Good Hangar Fenceline - S Corner 2/17/2024 8 AM 39 Good Hangar Fenceline - S Side 2/17/2024 8 AM 41 Good Hangar Fenceline - SW Corner 2/17/2024 8 AM 38 Good Hangar Fenceline - SW Side 2/17/2024 8 AM 39 Good Hangar Fenceline - W Side 2/17/2024 8 AM 34 Good Heritage Elementary 2/17/2024 8 AM 36 Good Legacy Academy 2/17/2024 8 AM 45 Good Legacy Road 2/17/2024 8 AM 37 Good Moffett and Tustin Ranch 2/17/2024 8 AM 41 Good OC Animal Shelter 2/17/2024 8 AM 41 Good Valencia and Armstrong 2/17/2024 8 AM 33 Good Valencia and Columbus Square 2/17/2024 8 AM 32 Good Valencia and Legacy 2/17/2024 8 AM 40 Good Victory and Tustin Ranch Rd. 2/17/2024 8 AM 41 Good Warner and Armstrong 2/17/2024 8 AM 32 Good Warner Avenue 2/17/2024 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Sunday, February 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/18/2024 8 AM Matter 22 Level of Concern Good Fire Station 37 2/18/2024 8 AM 21 Good Hangar Fenceline - E Side 2/18/2024 8 AM 25 Good Hangar Fenceline - N Center 2/18/2024 8 AM 23 Good Hangar Fenceline - N Corner 2/18/2024 8 AM 25 Good Hangar Fenceline - NE Corner 2/18/2024 8 AM 25 Good Hangar Fenceline - NE Side 2/18/2024 8 AM 26 Good Hangar Fenceline - S Corner 2/18/2024 8 AM 28 Good Hangar Fenceline - S Side 2/18/2024 8 AM 23 Good Hangar Fenceline - SW Corner 2/18/2024 8 AM 19 Good Hangar Fenceline - SW Side 2/18/2024 8 AM 28 Good Hangar Fenceline - W Side 2/18/2024 8 AM 23 Good Heritage Elementary 2/18/2024 8 AM 24 Good Legacy Academy 2/18/2024 8 AM 28 Good Legacy Road 2/18/2024 8 AM 25 Good Moffett and Tustin Ranch 2/18/2024 8 AM 28 Good OC Animal Shelter 2/18/2024 8 AM 28 Good Valencia and Armstrong 2/18/2024 8 AM 23 Good Valencia and Columbus Square 2/18/2024 8 AM 21 Good Valencia and Legacy 2/18/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 2/18/2024 8 AM 27 Good Warner and Armstrong 2/18/2024 8 AM 22 Good Warner Avenue 2/18/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Monday, February 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/19/2024 8 AM Matter • 4 Level of Concern Good Fire Station 37 2/19/2024 8 AM 7 Good Hangar Fenceline - E Side 2/19/2024 8 AM 5 Good Hangar Fenceline - N Center 2/19/2024 8 AM 5 Good Hangar Fenceline - N Corner 2/19/2024 8 AM 5 Good Hangar Fenceline - NE Corner ** ** ** Hangar Fenceline - NE Side 2/19/2024 8 AM 5 Good Hangar Fenceline - S Corner 2/19/2024 8 AM 5 Good Hangar Fenceline - S Side 2/19/2024 8 AM 6 Good Hangar Fenceline - SW Corner 2/19/2024 8 AM 4 Good Hangar Fenceline - SW Side 2/19/2024 8 AM 5 Good Hangar Fenceline - W Side ** ** ** Heritage Elementary 2/19/2024 8 AM 4 Good Legacy Academy 2/19/2024 8 AM 5 Good Legacy Road 2/19/2024 8 AM 4 Good Moffett and Tustin Ranch 2/19/2024 8 AM 6 Good OC Animal Shelter 2/19/2024 8 AM 5 Good Valencia and Armstrong 2/19/2024 8 AM 4 Good Valencia and Columbus Square 2/19/2024 8 AM 4 Good Valencia and Legacy 2/19/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 2/19/2024 8 AM 5 Good Warner and Armstrong 2/19/2024 8 AM 4 Good Warner Avenue 2/19/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Tuesday, February 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/20/2024 8 AM Matter • 2 Level of Concern Good Fire Station 37 2/20/2024 8 AM 2 Good Hangar Fenceline - E Side 2/20/2024 8 AM 3 Good Hangar Fenceline - N Center 2/20/2024 8 AM 2 Good Hangar Fenceline - N Corner 2/20/2024 8 AM 3 Good Hangar Fenceline - NE Corner 2/20/2024 8 AM 3 Good Hangar Fenceline - NE Side 2/20/2024 8 AM 3 Good Hangar Fenceline - S Corner 2/20/2024 8 AM 3 Good Hangar Fenceline - S Side 2/20/2024 8 AM 3 Good Hangar Fenceline - SW Corner 2/20/2024 8 AM 3 Good Hangar Fenceline - SW Side 2/20/2024 8 AM 3 Good Hangar Fenceline - W Side 2/20/2024 8 AM 3 Good Heritage Elementary 2/20/2024 8 AM 2 Good Legacy Academy 2/20/2024 8 AM 3 Good Legacy Road 2/20/2024 8 AM 2 Good Moffett and Tustin Ranch 2/20/2024 8 AM 4 Good OC Animal Shelter 2/20/2024 8 AM 4 Good Valencia and Armstrong 2/20/2024 8AM 2 Good Valencia and Columbus Square 2/20/2024 8 AM 2 Good Valencia and Legacy 2/20/2024 8 AM 3 Good Victory and Tustin Ranch Rd. 2/20/2024 8 AM 4 Good Warner and Armstrong 2/20/2024 8 AM 2 Good Warner Avenue 2/20/2024 8 AM 2 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Wednesday, February 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/21/2024 8 AM Matter • 3 Level of Concern Good Fire Station 37 2/21/2024 8 AM 3 Good Hangar Fenceline - E Side 2/21/2024 8 AM 2 Good Hangar Fenceline - N Center 2/21/2024 8 AM 2 Good Hangar Fenceline - N Corner 2/21/2024 8 AM 3 Good Hangar Fenceline - NE Corner 2/21/2024 8 AM 3 Good Hangar Fenceline - NE Side 2/21/2024 8 AM 4 Good Hangar Fenceline - S Corner 2/21/2024 8 AM 3 Good Hangar Fenceline - S Side 2/21/2024 8 AM 3 Good Hangar Fenceline - SW Corner 2/21/2024 8 AM 4 Good Hangar Fenceline - SW Side 2/21/2024 8 AM 3 Good Hangar Fenceline - W Side 2/21/2024 8 AM 3 Good Heritage Elementary 2/21/2024 8 AM 3 Good Legacy Academy 2/21/2024 8 AM 5 Good Legacy Road 2/21/2024 8 AM 3 Good Moffett and Tustin Ranch 2/21/2024 8 AM 5 Good OC Animal Shelter 2/21/2024 8 AM 4 Good Valencia and Armstrong 2/21/2024 8AM 2 Good Valencia and Columbus Square 2/21/2024 8 AM 3 Good Valencia and Legacy 2/21/2024 8 AM 4 Good Victory and Tustin Ranch Rd. 2/21/2024 8 AM 5 Good Warner and Armstrong 2/21/2024 8 AM 2 Good Warner Avenue 2/21/2024 8AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Thursday, February 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/22/2024 8 AM Matter • 4 Level of Concern Good Fire Station 37 2/22/2024 8 AM 7 Good Hangar Fenceline - E Side 2/22/2024 8 AM 5 Good Hangar Fenceline - N Center 2/22/2024 8 AM 4 Good Hangar Fenceline - N Corner 2/22/2024 8 AM 5 Good Hangar Fenceline - NE Corner 2/22/2024 8 AM 6 Good Hangar Fenceline - NE Side 2/22/2024 8 AM 6 Good Hangar Fenceline - S Corner 2/22/2024 8 AM 5 Good Hangar Fenceline - S Side 2/22/2024 8 AM 7 Good Hangar Fenceline - SW Corner 2/22/2024 8 AM 5 Good Hangar Fenceline - SW Side 2/22/2024 8 AM 8 Good Hangar Fenceline - W Side 2/22/2024 8 AM 5 Good Heritage Elementary 2/22/2024 8 AM 5 Good Legacy Academy 2/22/2024 8 AM 6 Good Legacy Road 2/22/2024 8 AM 5 Good Moffett and Tustin Ranch 2/22/2024 8 AM 9 Good OC Animal Shelter 2/22/2024 8 AM 6 Good Valencia and Armstrong 2/22/2024 8 AM 4 Good Valencia and Columbus Square 2/22/2024 8 AM 4 Good Valencia and Legacy 2/22/20248AM 7 Good Victory and Tustin Ranch Rd. 2/22/2024 8 AM 7 Good Warner and Armstrong 2/22/2024 8 AM 3 Good Warner Avenue 2/22/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Friday, February 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy (355 to 424) Columbus Square Park PeriodLocation 24-Hour Ending 2/23/2024 8 AM Particulate Matter • 11 Level of Concern Good Fire Station 37 2/23/2024 8 AM 13 Good Hangar Fenceline - E Side 2/23/2024 8 AM 15 Good Hangar Fenceline - N Center 2/23/2024 8 AM 11 Good Hangar Fenceline - N Corner 2/23/2024 8 AM 14 Good Hangar Fenceline - NE Corner 2/23/2024 8 AM 14 Good Hangar Fenceline - NE Side 2/23/2024 8 AM 15 Good Hangar Fenceline - S Corner 2/23/2024 8 AM 14 Good Hangar Fenceline - S Side 2/23/2024 8 AM 18 Good Hangar Fenceline - SW Corner 2/23/2024 8 AM 12 Good Hangar Fenceline - SW Side 2/23/2024 8 AM 16 Good Hangar Fenceline - W Side 2/23/2024 8 AM 15 Good Heritage Elementary 2/23/2024 8 AM 13 Good Legacy Academy 2/23/2024 8 AM 18 Good Legacy Road 2/23/2024 8 AM 14 Good Moffett and Tustin Ranch 2/23/2024 8AM 19 Good OC Animal Shelter 2/23/2024 8 AM 19 Good Valencia and Armstrong 2/23/2024 8 AM 11 Good Valencia and Columbus Square 2/23/2024 8 AM 12 Good Valencia and Legacy 2/23/20248AM 17 Good Victory and Tustin Ranch Rd. 2/23/2024 8 AM 18 Good Warner and Armstrong 2/23/2024 8 AM 11 Good Warner Avenue 2/23/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. • .ns: elikely veryone is more • be affected. Saturday, February 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/24/2024 8 AM Matter • 8 Level of Concern Good Fire Station 37 2/24/2024 8 AM 10 Good Hangar Fenceline - E Side 2/24/2024 8 AM 9 Good Hangar Fenceline - N Center 2/24/2024 8 AM 9 Good Hangar Fenceline - N Corner 2/24/2024 8 AM 9 Good Hangar Fenceline - NE Corner 2/24/2024 8 AM 9 Good Hangar Fenceline - NE Side 2/24/2024 8 AM 11 Good Hangar Fenceline - S Corner 2/24/2024 8 AM 8 Good Hangar Fenceline - S Side 2/24/2024 8 AM 12 Good Hangar Fenceline - SW Corner 2/24/2024 8 AM 9 Good Hangar Fenceline - SW Side 2/24/2024 8 AM 11 Good Hangar Fenceline - W Side 2/24/2024 8 AM 8 Good Heritage Elementary 2/24/2024 8 AM 10 Good Legacy Academy 2/24/2024 8 AM 13 Good Legacy Road 2/24/2024 8 AM 8 Good Moffett and Tustin Ranch 2/24/2024 8 AM 8 Good OC Animal Shelter 2/24/2024 8 AM 15 Good Valencia and Armstrong 2/24/2024 8 AM 7 Good Valencia and Columbus Square 2/24/2024 8 AM 9 Good Valencia and Legacy 2/24/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 2/24/2024 8 AM 11 Good Warner and Armstrong 2/24/2024 8 AM 7 Good Warner Avenue 2/24/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Sunday, February 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/25/2024 8 AM Matter • 12 Level of Concern Good Fire Station 37 2/25/2024 8 AM 14 Good Hangar Fenceline - E Side 2/25/2024 8 AM 15 Good Hangar Fenceline - N Center 2/25/2024 8 AM 14 Good Hangar Fenceline - N Corner 2/25/2024 8 AM 15 Good Hangar Fenceline - NE Corner 2/25/2024 8 AM 14 Good Hangar Fenceline - NE Side 2/25/2024 8 AM 16 Good Hangar Fenceline - S Corner 2/25/2024 8 AM 16 Good Hangar Fenceline - S Side 2/25/2024 8 AM 20 Good Hangar Fenceline - SW Corner 2/25/2024 8 AM 16 Good Hangar Fenceline - SW Side 2/25/2024 8 AM 16 Good Hangar Fenceline - W Side 2/25/2024 8 AM 15 Good Heritage Elementary 2/25/2024 8 AM 14 Good Legacy Academy 2/25/2024 8 AM 18 Good Legacy Road 2/25/2024 8 AM 16 Good Moffett and Tustin Ranch 2/25/2024 8 AM 18 Good OC Animal Shelter 2/25/2024 8 AM 20 Good Valencia and Armstrong 2/25/2024 8 AM 14 Good Valencia and Columbus Square 2/25/2024 8 AM 13 Good Valencia and Legacy 2/25/20248AM 17 Good Victory and Tustin Ranch Rd. 2/25/2024 8 AM 18 Good Warner and Armstrong 2/25/2024 8 AM 14 Good Warner Avenue 2/25/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Monday, February 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/26/2024 8 AM Matter • 14 Level of Concern Good Fire Station 37 2/26/2024 8 AM 17 Good Hangar Fenceline - E Side 2/26/2024 8 AM 18 Good Hangar Fenceline - N Center 2/26/2024 8 AM 17 Good Hangar Fenceline - N Corner 2/26/2024 8 AM 19 Good Hangar Fenceline - NE Corner 2/26/2024 8 AM 18 Good Hangar Fenceline - NE Side 2/26/2024 8 AM 20 Good Hangar Fenceline - S Corner 2/26/2024 8 AM 20 Good Hangar Fenceline - S Side 2/26/2024 8 AM 23 Good Hangar Fenceline - SW Corner 2/26/2024 8 AM 19 Good Hangar Fenceline - SW Side 2/26/2024 8 AM 19 Good Hangar Fenceline - W Side 2/26/2024 8 AM 18 Good Heritage Elementary 2/26/2024 8 AM 18 Good Legacy Academy 2/26/2024 8 AM 23 Good Legacy Road 2/26/2024 8 AM 21 Good Moffett and Tustin Ranch 2/26/2024 8 AM 21 Good OC Animal Shelter 2/26/2024 8 AM 25 Good Valencia and Armstrong 2/26/2024 8AM 18 Good Valencia and Columbus Square 2/26/2024 8 AM 15 Good Valencia and Legacy 2/26/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 2/26/2024 8 AM 23 Good Warner and Armstrong 2/26/2024 8 AM 17 Good Warner Avenue 2/26/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Tuesday, February 27 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/27/2024 8 AM Matter 28 Level of Concern Good Fire Station 37 2/27/2024 8 AM 29 Good Hangar Fenceline - E Side 2/27/2024 8 AM 35 Good Hangar Fenceline - N Center 2/27/2024 8 AM 32 Good Hangar Fenceline - N Corner 2/27/2024 8 AM 35 Good Hangar Fenceline - NE Corner 2/27/2024 8 AM 34 Good Hangar Fenceline - NE Side 2/27/2024 8 AM 36 Good Hangar Fenceline - S Corner 2/27/2024 8 AM 34 Good Hangar Fenceline - S Side 2/27/2024 8 AM 37 Good Hangar Fenceline - SW Corner 2/27/2024 8 AM 34 Good Hangar Fenceline - SW Side 2/27/2024 8 AM 36 Good Hangar Fenceline - W Side 2/27/2024 8 AM 33 Good Heritage Elementary 2/27/2024 8 AM 35 Good Legacy Academy 2/27/2024 8 AM 40 Good Legacy Road 2/27/2024 8 AM 39 Good Moffett and Tustin Ranch 2/27/2024 8 AM 43 Good OC Animal Shelter 2/27/2024 8 AM 45 Good Valencia and Armstrong 2/27/2024 8AM 33 Good Valencia and Columbus Square 2/27/2024 8 AM 28 Good Valencia and Legacy 2/27/2024 8 AM 40 Good Victory and Tustin Ranch Rd. 2/27/2024 8 AM 40 Good Warner and Armstrong 2/27/2024 8 AM 33 Good Warner Avenue 2/27/2024 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Wednesday, February 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/28/2024 8 AM Matter • 8 Level of Concern Good Fire Station 37 2/28/2024 8 AM 10 Good Hangar Fenceline - E Side 2/28/2024 8 AM 10 Good Hangar Fenceline - N Center 2/28/2024 8 AM 11 Good Hangar Fenceline - N Corner 2/28/2024 8 AM 10 Good Hangar Fenceline - NE Corner 2/28/2024 8 AM 10 Good Hangar Fenceline - NE Side 2/28/2024 8 AM 12 Good Hangar Fenceline - S Corner 2/28/2024 8 AM 10 Good Hangar Fenceline - S Side 2/28/2024 8 AM 13 Good Hangar Fenceline - SW Corner 2/28/2024 8 AM 10 Good Hangar Fenceline - SW Side 2/28/2024 8 AM 16 Good Hangar Fenceline - W Side 2/28/2024 8 AM 10 Good Heritage Elementary 2/28/2024 8 AM 10 Good Legacy Academy 2/28/2024 8 AM 15 Good Legacy Road 2/28/2024 8 AM 10 Good Moffett and Tustin Ranch 2/28/2024 8 AM 14 Good OC Animal Shelter 2/28/2024 8 AM 9 Good Valencia and Armstrong 2/28/2024 8 AM 9 Good Valencia and Columbus Square 2/28/2024 8 AM 7 Good Valencia and Legacy 2/28/20248AM 13 Good Victory and Tustin Ranch Rd. 2/28/2024 8 AM 12 Good Warner and Armstrong 2/28/2024 8 AM 7 Good Warner Avenue 2/28/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Thursday, February 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 2/29/2024 8 AM Matter • 16 Level of Concern Good Fire Station 37 2/29/2024 8 AM 19 Good Hangar Fenceline - E Side 2/29/2024 8 AM 21 Good Hangar Fenceline - N Center 2/29/2024 8 AM 20 Good Hangar Fenceline - N Corner 2/29/2024 8 AM 21 Good Hangar Fenceline - NE Corner 2/29/2024 8 AM 22 Good Hangar Fenceline - NE Side 2/29/2024 8 AM 23 Good Hangar Fenceline - S Corner 2/29/2024 8 AM 21 Good Hangar Fenceline - S Side 2/29/2024 8 AM 25 Good Hangar Fenceline - SW Corner 2/29/2024 8 AM 21 Good Hangar Fenceline - SW Side 2/29/2024 8 AM 26 Good Hangar Fenceline - W Side 2/29/2024 8 AM 21 Good Heritage Elementary 2/29/2024 8 AM 21 Good Legacy Academy 2/29/2024 8 AM 29 Good Legacy Road 2/29/2024 8 AM 22 Good Moffett and Tustin Ranch 2/29/2024 8 AM 30 Good OC Animal Shelter 2/29/2024 8 AM 27 Good Valencia and Armstrong 2/29/2024 8 AM 19 Good Valencia and Columbus Square 2/29/2024 8 AM 17 Good Valencia and Legacy 2/29/20248AM 25 Good Victory and Tustin Ranch Rd. 2/29/2024 8 AM 27 Good Warner and Armstrong 2/29/2024 8 AM 18 Good Warner Avenue 2/29/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Friday March 1, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 3/1 /2024 8 AM Matter • 4 Level of Concern Good Fire Station 37 3/1/2024 8 AM 5 Good Hangar Fenceline - E Side 3/1/2024 8 AM 6 Good Hangar Fenceline - N Center 3/1/2024 8 AM 5 Good Hangar Fenceline - N Corner 3/1/2024 8 AM 6 Good Hangar Fenceline - NE Corner 3/1/2024 8 AM 7 Good Hangar Fenceline - NE Side 3/1/2024 8 AM 8 Good Hangar Fenceline - S Corner 3/1/2024 8 AM 7 Good Hangar Fenceline - S Side 3/1/2024 8 AM 9 Good Hangar Fenceline - SW Corner 3/1/2024 8 AM 7 Good Hangar Fenceline - SW Side 3/1/2024 8 AM 8 Good Hangar Fenceline - W Side 3/1/2024 8AM ** Heritage Elementary 3/1/2024 8 AM 6 Good Legacy Academy 3/1/2024 8 AM g Good Legacy Road 3/1/2024 8 AM 6 Good Moffett and Tustin Ranch 3/1/2024 8 AM 10 Good OC Animal Shelter 3/1/2024 8 AM 17 Good Valencia and Armstrong 3/1/2024 8 AM 5 Good Valencia and Columbus Square 3/1/2024 8 AM 5 Good Valencia and Legacy 3/1/2024 8AM g Good Victory and Tustin Ranch Rd. 3/1/2024 8 AM 10 Good Warner and Armstrong 3/1/2024 8AM 4 Good Warner Avenue 3/1/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Saturday March 2, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 3/2/2024 8 AM Matter • 1 Level of Concern Good Fire Station 37 3/2/2024 8 AM 5 Good Hangar Fenceline - E Side 3/2/2024 8 AM 2 Good Hangar Fenceline - N Center 3/2/2024 8 AM 2 Good Hangar Fenceline - N Corner 3/2/2024 8 AM 2 Good Hangar Fenceline - NE Corner 3/2/2024 8 AM 3 Good Hangar Fenceline - NE Side 3/2/2024 8 AM 3 Good Hangar Fenceline - S Corner 3/2/2024 8 AM 3 Good Hangar Fenceline - S Side 3/2/2024 8 AM 4 Good Hangar Fenceline - SW Corner 3/2/2024 8 AM 3 Good Hangar Fenceline - SW Side 3/2/2024 8 AM 8 Good Hangar Fenceline - W Side 3/2/2024 8 AM 11 Good Heritage Elementary 3/2/2024 8 AM 2 Good Legacy Academy 3/2/2024 8 AM 4 Good Legacy Road 3/2/2024 8 AM 2 Good Moffett and Tustin Ranch 3/2/2024 8 AM 4 Good OC Animal Shelter 3/2/2024 8 AM 5 Good Valencia and Armstrong 3/2/2024 8 AM 2 Good Valencia and Columbus Square 3/2/2024 8 AM 2 Good Valencia and Legacy 3/2/2024 8AM 2 Good Victory and Tustin Ranch Rd. 3/2/2024 8 AM 3 Good Warner and Armstrong 3/2/2024 8 AM 3 Good Warner Avenue 3/2/2024 8 AM 2 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Sunday March 3, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 3/3/2024 8 AM Matter • 2 Level of Concern Good Fire Station 37 3/3/2024 8 AM 9 Good Hangar Fenceline - E Side 3/3/2024 8 AM 4 Good Hangar Fenceline - N Center 3/3/2024 8 AM 2 Good Hangar Fenceline - N Corner 3/3/2024 8 AM 3 Good Hangar Fenceline - NE Corner 3/3/2024 8 AM 4 Good Hangar Fenceline - NE Side 3/3/2024 8 AM 5 Good Hangar Fenceline - S Corner 3/3/2024 8 AM 4 Good Hangar Fenceline - S Side 3/3/2024 8 AM 4 Good Hangar Fenceline - SW Corner 3/3/2024 8 AM 4 Good Hangar Fenceline - SW Side 3/3/2024 8 AM 5 Good Hangar Fenceline - W Side 3/3/2024 8 AM 3 Good Heritage Elementary 3/3/2024 8 AM 3 Good Legacy Academy 3/3/2024 8 AM 4 Good Legacy Road 3/3/2024 8 AM 2 Good Moffett and Tustin Ranch 3/3/2024 8 AM 4 Good OC Animal Shelter 3/3/2024 8 AM 11 Good Valencia and Armstrong 3/3/2024 8 AM 2 Good Valencia and Columbus Square 3/3/2024 8 AM 3 Good Valencia and Legacy 3/3/2024 8AM 4 Good Victory and Tustin Ranch Rd. 3/3/2024 8 AM 5 Good Warner and Armstrong 3/3/2024 8 AM 2 Good Warner Avenue 3/3/2024 8 AM 2 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Monday, March 4, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 3/4/2024 8 AM Matter • 4 Level of Concern Good Fire Station 37 3/4/2024 8 AM 4 Good Hangar Fenceline - E Side 3/4/2024 8 AM 5 Good Hangar Fenceline - N Center 3/4/2024 8 AM 4 Good Hangar Fenceline - N Corner 3/4/2024 8 AM 6 Good Hangar Fenceline - NE Corner 3/4/2024 8 AM 3 Good Hangar Fenceline - NE Side 3/4/2024 8 AM 12 Good Hangar Fenceline - S Corner 3/4/2024 8 AM 4 Good Hangar Fenceline - S Side 3/4/2024 8 AM 5 Good Hangar Fenceline - SW Corner 3/4/2024 8 AM 4 Good Hangar Fenceline - SW Side 3/4/2024 8 AM 3 Good Hangar Fenceline - W Side 3/4/2024 8 AM 3 Good Heritage Elementary 3/4/2024 8 AM 5 Good Legacy Academy 3/4/2024 8 AM 3 Good Legacy Road 3/4/2024 8 AM 7 Good Moffett and Tustin Ranch 3/4/2024 8 AM 3 Good OC Animal Shelter 3/4/2024 8 AM 3 Good Valencia and Armstrong 3/4/2024 8 AM 3 Good Valencia and Columbus Square 3/4/2024 8 AM 10 Good Valencia and Legacy 3/4/2024 8AM 4 Good Victory and Tustin Ranch Rd. 3/4/2024 8 AM 7 Good Warner and Armstrong 3/4/2024 8 AM 3 Good Warner Avenue 3/4/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Tuesday, March 5, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 3/5/2024 8 AM Matter • 3 Level of Concern Good Fire Station 37 3/5/2024 8 AM 6 Good Hangar Fenceline - E Side 3/5/2024 8 AM 4 Good Hangar Fenceline - N Center 3/5/2024 8 AM 4 Good Hangar Fenceline - N Corner 3/5/2024 8 AM 3 Good Hangar Fenceline - NE Corner 3/5/2024 8 AM 4 Good Hangar Fenceline - NE Side 3/5/2024 8 AM 5 Good Hangar Fenceline - S Corner 3/5/2024 8 AM 4 Good Hangar Fenceline - S Side 3/5/2024 8 AM 7 Good Hangar Fenceline - SW Corner 3/5/2024 8 AM 5 Good Hangar Fenceline - SW Side 3/5/2024 8 AM 8 Good Hangar Fenceline - W Side 3/5/2024 8 AM 4 Good Heritage Elementary 3/5/2024 8 AM 3 Good Legacy Academy 3/5/2024 8 AM 6 Good Legacy Road 3/5/2024 8 AM 2 Good Moffett and Tustin Ranch 3/5/2024 8 AM 7 Good OC Animal Shelter 3/5/2024 8 AM g Good Valencia and Armstrong 3/5/2024 8 AM 3 Good Valencia and Columbus Square 3/5/2024 8 AM 4 Good Valencia and Legacy 3/5/2024 8AM 4 Good Victory and Tustin Ranch Rd. 3/5/2024 8 AM 6 Good Warner and Armstrong 3/5/2024 8 AM 2 Good Warner Avenue 3/5/2024 8 AM 2 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of - .- more conditions: everyone is likely • be affected. Wednesday, March 6, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 3/6/2024 8 AM Matter • 4 Level of Concern Good Fire Station 37 3/6/2024 8 AM 5 Good Hangar Fenceline - E Side 3/6/2024 8 AM 5 Good Hangar Fenceline - N Center 3/6/2024 8 AM 4 Good Hangar Fenceline - N Corner 3/6/2024 8 AM 5 Good Hangar Fenceline - NE Corner 3/6/2024 8 AM 6 Good Hangar Fenceline - NE Side 3/6/2024 8 AM 4 Good Hangar Fenceline - S Corner 3/6/2024 8 AM 6 Good Hangar Fenceline - S Side 3/6/2024 8 AM g Good Hangar Fenceline - SW Corner 3/6/2024 8 AM 5 Good Hangar Fenceline - SW Side 3/6/2024 8 AM g Good Hangar Fenceline - W Side 3/6/2024 8 AM 5 Good Heritage Elementary 3/6/2024 8 AM 4 Good Legacy Academy 3/6/2024 8 AM 8 Good Legacy Road 3/6/2024 8 AM 4 Good Moffett and Tustin Ranch 3/6/2024 8 AM 8 Good OC Animal Shelter 3/6/2024 8 AM 7 Good Valencia and Armstrong 3/6/2024 8AM 4 Good Valencia and Columbus Square 3/6/2024 8 AM 4 Good Valencia and Legacy 3/6/2024 8AM 7 Good Victory and Tustin Ranch Rd. 3/6/2024 8 AM 8 Good Warner and Armstrong 3/6/2024 8 AM 3 Good Warner Avenue 3/6/2024 8 AM 2 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Thursday, March, 07, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/07/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 03/07/2024 8 AM 6 Good Hangar Fenceline - E Side 03/07/2024 8 AM 9 Good Hangar Fenceline - N Center 03/07/2024 8 AM 5 Good Hangar Fenceline - N Corner 03/07/2024 8 AM 6 Good Hangar Fenceline - NE Corner 03/07/2024 8 AM 7 Good Hangar Fenceline - NE Side 03/07/2024 8 AM 6 Good Hangar Fenceline - S Corner 03/07/2024 8 AM 6 Good Hangar Fenceline - S Side 03/07/2024 8 AM 7 Good Hangar Fenceline - SW Corner 03/07/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/07/2024 8 AM Particulate Matter • 12 Level of Concern Good Hangar Fenceline - W Side 03/07/2024 8 AM 7 Good Heritage Elementary 03/07/2024 8 AM 6 Good Legacy Academy 03/07/2024 8 AM 8 Good Legacy Road 03/07/2024 8 AM 7 Good Moffett and Tustin Ranch 03/07/2024 8 AM 19 Good OC Animal Shelter 03/07/2024 8 AM 13 Good Valencia and Armstrong 03/07/2024 8 AM 6 Good Valencia and Columbus Square 03/07/2024 8 AM 6 Good Valencia and Legacy 03/07/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 03/07/2024 8 AM 8 Good Warner and Armstrong 03/07/2024 8 AM 3 Good Warner Avenue 03/07/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, March, 08, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/08/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 03/08/2024 8 AM 6 Good Hangar Fenceline - E Side 03/08/2024 8 AM 8 Good Hangar Fenceline - N Center 03/08/2024 8 AM 5 Good Hangar Fenceline - N Corner 03/08/2024 8 AM 7 Good Hangar Fenceline - NE Corner 03/08/2024 8 AM 8 Good Hangar Fenceline - NE Side 03/08/2024 8 AM 7 Good Hangar Fenceline - S Corner 03/08/2024 8 AM 7 Good Hangar Fenceline - S Side 03/08/2024 8 AM 10 Good Hangar Fenceline - SW Corner 03/08/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/08/2024 8 AM Particulate Matter • 11 Level of Concern Good Hangar Fenceline - W Side 03/08/2024 8 AM 8 Good Heritage Elementary 03/08/2024 8 AM 6 Good Legacy Academy 03/08/2024 8 AM 10 Good Legacy Road 03/08/2024 8 AM 6 Good Moffett and Tustin Ranch 03/08/2024 8 AM 12 Good OC Animal Shelter 03/08/2024 8 AM 14 Good Valencia and Armstrong 03/08/2024 8 AM 6 Good Valencia and Columbus Square 03/08/2024 8 AM 6 Good Valencia and Legacy 03/08/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 03/08/2024 8 AM 10 Good Warner and Armstrong 03/08/2024 8 AM 4 Good Warner Avenue 03/08/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, March, 09, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/09/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 03/09/2024 8 AM 10 Good Hangar Fenceline - E Side 03/09/2024 8 AM 12 Good Hangar Fenceline - N Center 03/09/2024 8 AM 9 Good Hangar Fenceline - N Corner 03/09/2024 8 AM 10 Good Hangar Fenceline - NE Corner 03/09/2024 8 AM 11 Good Hangar Fenceline - NE Side 03/09/2024 8 AM 10 Good Hangar Fenceline - S Corner 03/09/2024 8 AM 10 Good Hangar Fenceline - S Side 03/09/2024 8 AM 13 Good Hangar Fenceline - SW Corner 03/09/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/09/2024 8 AM Particulate Matter 19 Level of Concern Good Hangar Fenceline - W Side 03/09/2024 8 AM 12 Good Heritage Elementary 03/09/2024 8 AM 9 Good Legacy Academy 03/09/2024 8 AM 15 Good Legacy Road 03/09/2024 8 AM 9 Good Moffett and Tustin Ranch 03/09/2024 8 AM 16 Good OC Animal Shelter 03/09/2024 8 AM 15 Good Valencia and Armstrong 03/09/2024 8 AM 9 Good Valencia and Columbus Square 03/09/2024 8 AM 9 Good Valencia and Legacy 03/09/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 03/09/2024 8 AM 15 Good Warner and Armstrong 03/09/2024 8 AM 7 Good Warner Avenue 03/09/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, March, 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/10/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 03/10/2024 8 AM 12 Good Hangar Fenceline - E Side 03/10/2024 8 AM 14 Good Hangar Fenceline - N Center 03/10/2024 8 AM 12 Good Hangar Fenceline - N Corner 03/10/2024 8 AM 8 Good Hangar Fenceline - NE Corner 03/10/2024 8 AM 13 Good Hangar Fenceline - NE Side 03/10/2024 8 AM 8 Good Hangar Fenceline - S Corner 03/10/2024 8 AM 14 Good Hangar Fenceline - S Side 03/10/2024 8 AM 16 Good Hangar Fenceline - SW Corner 03/10/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/10/2024 8 AM Particulate Matter 21 Level of Concern Good Hangar Fenceline - W Side 03/10/2024 8 AM 13 Good Heritage Elementary 03/10/2024 8 AM 12 Good Legacy Academy 03/10/2024 8 AM 17 Good Legacy Road 03/10/2024 8 AM 12 Good Moffett and Tustin Ranch 03/10/2024 8 AM 20 Good OC Animal Shelter 03/10/2024 8 AM 21 Good Valencia and Armstrong 03/10/2024 8 AM 12 Good Valencia and Columbus Square 03/10/2024 8 AM 10 Good Valencia and Legacy 03/10/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 03/10/2024 8 AM 16 Good Warner and Armstrong 03/10/2024 8 AM 11 Good Warner Avenue 03/10/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, March, 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/11/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 03/11/2024 8 AM 8 Good Hangar Fenceline - E Side 03/11/2024 8 AM 7 Good Hangar Fenceline - N Center 03/11/2024 8 AM 7 Good Hangar Fenceline - N Corner 03/11/2024 8 AM 8 Good Hangar Fenceline - NE Corner 03/11/2024 8 AM 9 Good Hangar Fenceline - NE Side 03/11/2024 8 AM 9 Good Hangar Fenceline - S Corner 03/11/2024 8 AM 10 Good Hangar Fenceline - S Side 03/11/2024 8 AM 13 Good Hangar Fenceline - SW Corner 03/11/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/11/2024 8 AM Particulate Matter • 11 Level of Concern Good Hangar Fenceline - W Side 03/11/2024 8 AM 9 Good Heritage Elementary 03/11/2024 8 AM 7 Good Legacy Academy 03/11/2024 8 AM 13 Good Legacy Road 03/11/2024 8 AM 8 Good Moffett and Tustin Ranch 03/11/2024 8 AM 21 Good OC Animal Shelter 03/11/2024 8 AM 11 Good Valencia and Armstrong 03/11/2024 8 AM 7 Good Valencia and Columbus Square 03/11/2024 8 AM 6 Good Valencia and Legacy 03/11/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 03/11/2024 8 AM 12 Good Warner and Armstrong 03/11/2024 8 AM 6 Good Warner Avenue 03/11/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, March, 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/12/2024 8 AM Matter 3 Level of Concern Good Fire Station 37 03/12/2024 8 AM 6 Good Hangar Fenceline - E Side 03/12/2024 8 AM 5 Good Hangar Fenceline - N Center 03/12/2024 8 AM 5 Good Hangar Fenceline - N Corner 03/12/2024 8 AM 6 Good Hangar Fenceline - NE Corner 03/12/2024 8 AM 7 Good Hangar Fenceline - NE Side 03/12/2024 8 AM 9 Good Hangar Fenceline - S Corner 03/12/2024 8 AM 11 Good Hangar Fenceline - S Side 03/12/2024 8 AM 12 Good Hangar Fenceline - SW Corner 03/12/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/12/2024 8 AM Particulate Matter • 11 Level of Concern Good Hangar Fenceline - W Side 03/12/2024 8 AM 6 Good Heritage Elementary 03/12/2024 8 AM 5 Good Legacy Academy 03/12/2024 8 AM 10 Good Legacy Road 03/12/2024 8 AM 5 Good Moffett and Tustin Ranch 03/12/2024 8 AM 17 Good OC Animal Shelter 03/12/2024 8 AM 10 Good Valencia and Armstrong 03/12/2024 8 AM 4 Good Valencia and Columbus Square 03/12/2024 8 AM 4 Good Valencia and Legacy 03/12/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 03/12/2024 8 AM 10 Good Warner and Armstrong 03/12/2024 8 AM 4 Good Warner Avenue 03/12/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, March, 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/13/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 03/13/2024 8 AM 5 Good Hangar Fenceline - E Side 03/13/2024 8 AM 6 Good Hangar Fenceline - N Center 03/13/2024 8 AM 5 Good Hangar Fenceline - N Corner 03/13/2024 8 AM 6 Good Hangar Fenceline - NE Corner 03/13/2024 8 AM 7 Good Hangar Fenceline - NE Side 03/13/2024 8 AM 10 Good Hangar Fenceline - S Corner 03/13/2024 8 AM 7 Good Hangar Fenceline - S Side 03/13/2024 8 AM 11 Good Hangar Fenceline - SW Corner 03/13/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/13/2024 8 AM Particulate Matter • 8 Level of Concern Good Hangar Fenceline - W Side 03/13/2024 8 AM 7 Good Heritage Elementary 03/13/2024 8 AM 5 Good Legacy Academy 03/13/2024 8 AM 10 Good Legacy Road 03/13/2024 8 AM 5 Good Moffett and Tustin Ranch 03/13/2024 8 AM 14 Good OC Animal Shelter 03/13/2024 8 AM 13 Good Valencia and Armstrong 03/13/2024 8 AM 5 Good Valencia and Columbus Square 03/13/2024 8 AM 5 Good Valencia and Legacy 03/13/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 03/13/2024 8 AM 10 Good Warner and Armstrong 03/13/2024 8 AM 4 Good Warner Avenue 03/13/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, March, 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/14/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 03/14/2024 8 AM 8 Good Hangar Fenceline - E Side 03/14/2024 8 AM 9 Good Hangar Fenceline - N Center 03/14/2024 8 AM 6 Good Hangar Fenceline - N Corner 03/14/2024 8 AM 8 Good Hangar Fenceline - NE Corner 03/14/2024 8 AM 22 Good Hangar Fenceline - NE Side 03/14/2024 8 AM 12 Good Hangar Fenceline - S Corner 03/14/2024 8 AM 11 Good Hangar Fenceline - S Side 03/14/2024 8 AM 15 Good Hangar Fenceline - SW Corner 03/14/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/14/2024 8 AM Particulate Matter • 13 Level of Concern Good Hangar Fenceline - W Side 03/14/2024 8 AM 10 Good Heritage Elementary 03/14/2024 8 AM 8 Good Legacy Academy 03/14/2024 8 AM 14 Good Legacy Road 03/14/2024 8 AM 8 Good Moffett and Tustin Ranch 03/14/2024 8 AM 24 Good OC Animal Shelter 03/14/2024 8 AM 17 Good Valencia and Armstrong 03/14/2024 8 AM 7 Good Valencia and Columbus Square 03/14/2024 8 AM 6 Good Valencia and Legacy 03/14/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 03/14/2024 8 AM 15 Good Warner and Armstrong 03/14/2024 8 AM 7 Good Warner Avenue 03/14/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, March, 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/15/2024 8 AM Matter 3 Level of Concern Good Fire Station 37 03/15/2024 8 AM 6 Good Hangar Fenceline - E Side 03/15/2024 8 AM 4 Good Hangar Fenceline - N Center 03/15/2024 8 AM 4 Good Hangar Fenceline - N Corner 03/15/2024 8 AM 4 Good Hangar Fenceline - NE Corner 03/15/2024 8 AM 15 Good Hangar Fenceline - NE Side 03/15/2024 8 AM 6 Good Hangar Fenceline - S Corner 03/15/2024 8 AM 8 Good Hangar Fenceline - S Side 03/15/2024 8 AM 11 Good Hangar Fenceline - SW Corner 03/15/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/15/2024 8 AM Particulate Matter • 8 Level of Concern Good Hangar Fenceline - W Side 03/15/2024 8 AM 5 Good Heritage Elementary 03/15/2024 8 AM 4 Good Legacy Academy 03/15/2024 8 AM 11 Good Legacy Road 03/15/2024 8 AM 5 Good Moffett and Tustin Ranch 03/15/2024 8 AM 19 Good OC Animal Shelter 03/15/2024 8 AM 16 Good Valencia and Armstrong 03/15/2024 8 AM 3 Good Valencia and Columbus Square 03/15/2024 8 AM 3 Good Valencia and Legacy 03/15/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 03/15/2024 8 AM 10 Good Warner and Armstrong 03/15/2024 8 AM 4 Good Warner Avenue 03/15/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, March, 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/16/2024 8 AM Matter 3 Level of Concern Good Fire Station 37 03/16/2024 8 AM 6 Good Hangar Fenceline - E Side 03/16/2024 8 AM 5 Good Hangar Fenceline - N Center 03/16/2024 8 AM 4 Good Hangar Fenceline - N Corner 03/16/2024 8 AM 5 Good Hangar Fenceline - NE Corner 03/16/2024 8 AM 6 Good Hangar Fenceline - NE Side 03/16/2024 8 AM 7 Good Hangar Fenceline - S Corner 03/16/2024 8 AM 5 Good Hangar Fenceline - S Side 03/16/2024 8 AM 8 Good Hangar Fenceline - SW Corner 03/16/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/16/2024 8 AM Particulate Matter • 8 Level of Concern Good Hangar Fenceline - W Side 03/16/2024 8 AM 6 Good Heritage Elementary 03/16/2024 8 AM 5 Good Legacy Academy 03/16/2024 8 AM 8 Good Legacy Road 03/16/2024 8 AM 5 Good Moffett and Tustin Ranch 03/16/2024 8 AM 13 Good OC Animal Shelter 03/16/2024 8 AM 10 Good Valencia and Armstrong 03/16/2024 8 AM 4 Good Valencia and Columbus Square 03/16/2024 8 AM 4 Good Valencia and Legacy 03/16/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 03/16/2024 8 AM 8 Good Warner and Armstrong 03/16/2024 8 AM 5 Good Warner Avenue 03/16/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, March, 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/17/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 03/17/2024 8 AM 7 Good Hangar Fenceline - E Side 03/17/2024 8 AM 7 Good Hangar Fenceline - N Center 03/17/2024 8 AM 5 Good Hangar Fenceline - N Corner 03/17/2024 8 AM 7 Good Hangar Fenceline - NE Corner 03/17/2024 8 AM 8 Good Hangar Fenceline - NE Side 03/17/2024 8 AM 9 Good Hangar Fenceline - S Corner 03/17/2024 8 AM 8 Good Hangar Fenceline - S Side 03/17/2024 8 AM 12 Good Hangar Fenceline - SW Corner 03/17/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/17/2024 8 AM Particulate Matter 10 Level of Concern Good Hangar Fenceline - W Side 03/17/2024 8 AM 8 Good Heritage Elementary 03/17/2024 8 AM 6 Good Legacy Academy 03/17/2024 8 AM 10 Good Legacy Road 03/17/2024 8 AM 7 Good Moffett and Tustin Ranch 03/17/2024 8 AM 12 Good OC Animal Shelter 03/17/2024 8 AM 17 Good Valencia and Armstrong 03/17/2024 8 AM 6 Good Valencia and Columbus Square 03/17/2024 8 AM 6 Good Valencia and Legacy 03/17/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 03/17/2024 8 AM 11 Good Warner and Armstrong 03/17/2024 8 AM 6 Good Warner Avenue 03/17/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, March, 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/18/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 03/18/2024 8 AM 8 Good Hangar Fenceline - E Side 03/18/2024 8 AM 9 Good Hangar Fenceline - N Center 03/18/2024 8 AM 6 Good Hangar Fenceline - N Corner 03/18/2024 8 AM 9 Good Hangar Fenceline - NE Corner 03/18/2024 8 AM 9 Good Hangar Fenceline - NE Side 03/18/2024 8 AM 12 Good Hangar Fenceline - S Corner 03/18/2024 8 AM 9 Good Hangar Fenceline - S Side 03/18/2024 8 AM 15 Good Hangar Fenceline - SW Corner 03/18/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/18/2024 8 AM Particulate Matter • 14 Level of Concern Good Hangar Fenceline - W Side 03/18/2024 8 AM 10 Good Heritage Elementary 03/18/2024 8 AM 7 Good Legacy Academy 03/18/2024 8 AM 13 Good Legacy Road 03/18/2024 8 AM 8 Good Moffett and Tustin Ranch 03/18/2024 8 AM 22 Good OC Animal Shelter 03/18/2024 8 AM 13 Good Valencia and Armstrong 03/18/2024 8 AM 7 Good Valencia and Columbus Square 03/18/2024 8 AM 6 Good Valencia and Legacy 03/18/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 03/18/2024 8 AM 14 Good Warner and Armstrong 03/18/2024 8 AM 6 Good Warner Avenue 03/18/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, March, 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/19/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 03/19/2024 8 AM 12 Good Hangar Fenceline - E Side 03/19/2024 8 AM 15 Good Hangar Fenceline - N Center 03/19/2024 8 AM 11 Good Hangar Fenceline - N Corner 03/19/2024 8 AM 14 Good Hangar Fenceline - NE Corner 03/19/2024 8 AM 13 Good Hangar Fenceline - NE Side 03/19/2024 8 AM 15 Good Hangar Fenceline - S Corner 03/19/2024 8 AM 16 Good Hangar Fenceline - S Side 03/19/2024 8 AM 21 Good Hangar Fenceline - SW Corner 03/19/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/19/2024 8 AM Particulate Matter • 42 Level of Concern Good Hangar Fenceline - W Side 03/19/2024 8 AM 15 Good Heritage Elementary 03/19/2024 8 AM 12 Good Legacy Academy 03/19/2024 8 AM 18 Good Legacy Road 03/19/2024 8 AM 15 Good Moffett and Tustin Ranch 03/19/2024 8 AM 27 Good OC Animal Shelter 03/19/2024 8 AM 20 Good Valencia and Armstrong 03/19/2024 8 AM 12 Good Valencia and Columbus Square 03/19/2024 8 AM 10 Good Valencia and Legacy 03/19/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 03/19/2024 8 AM 19 Good Warner and Armstrong 03/19/2024 8 AM 13 Good Warner Avenue 03/19/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, March, 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/20/2024 8 AM Matter 11 Level of Concern Good Fire Station 37 03/20/2024 8 AM 15 Good Hangar Fenceline - E Side 03/20/2024 8 AM 17 Good Hangar Fenceline - N Center 03/20/2024 8 AM 11 Good Hangar Fenceline - N Corner 03/20/2024 8 AM 16 Good Hangar Fenceline - NE Corner 03/20/2024 8 AM 15 Good Hangar Fenceline - NE Side 03/20/2024 8 AM 19 Good Hangar Fenceline - S Corner 03/20/2024 8 AM 15 Good Hangar Fenceline - S Side 03/20/2024 8 AM 20 Good Hangar Fenceline - SW Corner 03/20/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/20/2024 8 AM Particulate Matter • 20 Level of Concern Good Hangar Fenceline - W Side 03/20/2024 8 AM 16 Good Heritage Elementary 03/20/2024 8 AM 14 Good Legacy Academy 03/20/2024 8 AM 22 Good Legacy Road 03/20/2024 8 AM 18 Good Moffett and Tustin Ranch 03/20/2024 8 AM 34 Good OC Animal Shelter 03/20/2024 8 AM 22 Good Valencia and Armstrong 03/20/2024 8 AM 14 Good Valencia and Columbus Square 03/20/2024 8 AM 12 Good Valencia and Legacy 03/20/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 03/20/2024 8 AM 21 Good Warner and Armstrong 03/20/2024 8 AM 13 Good Warner Avenue 03/20/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, March, 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/21/2024 8 AM Matter 12 Level of Concern Good Fire Station 37 03/21/2024 8 AM 14 Good Hangar Fenceline - E Side 03/21/2024 8 AM 17 Good Hangar Fenceline - N Center 03/21/2024 8 AM 27 Good Hangar Fenceline - N Corner 03/21/2024 8 AM 16 Good Hangar Fenceline - NE Corner 03/21/2024 8 AM 16 Good Hangar Fenceline - NE Side 03/21/2024 8 AM 18 Good Hangar Fenceline - S Corner 03/21/2024 8 AM 16 Good Hangar Fenceline - S Side 03/21/2024 8 AM 19 Good Hangar Fenceline - SW Corner 03/21/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/21/2024 8 AM Particulate Matter • 18 Level of Concern Good Hangar Fenceline - W Side 03/21/2024 8 AM 16 Good Heritage Elementary 03/21/2024 8 AM 14 Good Legacy Academy 03/21/2024 8 AM 19 Good Legacy Road 03/21/2024 8 AM 16 Good Moffett and Tustin Ranch 03/21/2024 8 AM 24 Good OC Animal Shelter 03/21/2024 8 AM 19 Good Valencia and Armstrong 03/21/2024 8 AM 15 Good Valencia and Columbus Square 03/21/2024 8 AM 14 Good Valencia and Legacy 03/21/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 03/21/2024 8 AM 20 Good Warner and Armstrong 03/21/2024 8 AM 14 Good Warner Avenue 03/21/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, March, 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/22/2024 8 AM Matter 16 Level of Concern Good Fire Station 37 03/22/2024 8 AM 18 Good Hangar Fenceline - E Side 03/22/2024 8 AM 22 Good Hangar Fenceline - N Center 03/22/2024 8 AM 16 Good Hangar Fenceline - N Corner 03/22/2024 8 AM 21 Good Hangar Fenceline - NE Corner 03/22/2024 8 AM 22 Good Hangar Fenceline - NE Side 03/22/2024 8 AM 23 Good Hangar Fenceline - S Corner 03/22/2024 8 AM 16 Good Hangar Fenceline - S Side 03/22/2024 8 AM 2S Good Hangar Fenceline - SW Corner 03/22/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/22/2024 8 AM Particulate Matter • 23 Level of Concern Good Hangar Fenceline - W Side 03/22/2024 8 AM 21 Good Heritage Elementary 03/22/2024 8 AM 19 Good Legacy Academy 03/22/2024 8 AM 25 Good Legacy Road 03/22/2024 8 AM 24 Good Moffett and Tustin Ranch 03/22/2024 8 AM 29 Good OC Animal Shelter 03/22/2024 8 AM 25 Good Valencia and Armstrong 03/22/2024 8 AM 20 Good Valencia and Columbus Square 03/22/2024 8 AM 18 Good Valencia and Legacy 03/22/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 03/22/2024 8 AM 25 Good Warner and Armstrong 03/22/2024 8 AM 18 Good Warner Avenue 03/22/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, March, 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/23/2024 8 AM Matter 12 Level of Concern Good Fire Station 37 03/23/2024 8 AM 14 Good Hangar Fenceline - E Side 03/23/2024 8 AM 15 Good Hangar Fenceline - N Center 03/23/2024 8 AM 12 Good Hangar Fenceline - N Corner 03/23/2024 8 AM 15 Good Hangar Fenceline - NE Corner 03/23/2024 8 AM 16 Good Hangar Fenceline - NE Side 03/23/2024 8 AM 17 Good Hangar Fenceline - S Corner 03/23/2024 8 AM 15 Good Hangar Fenceline - S Side 03/23/2024 8 AM 19 Good Hangar Fenceline - SW Corner 03/23/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/23/2024 8 AM Particulate Matter 18 Level of Concern Good Hangar Fenceline - W Side 03/23/2024 8 AM 16 Good Heritage Elementary 03/23/2024 8 AM 14 Good Legacy Academy 03/23/2024 8 AM 19 Good Legacy Road 03/23/2024 8 AM 16 Good Moffett and Tustin Ranch 03/23/2024 8 AM 26 Good OC Animal Shelter 03/23/2024 8 AM 23 Good Valencia and Armstrong 03/23/2024 8 AM 14 Good Valencia and Columbus Square 03/23/2024 8 AM 13 Good Valencia and Legacy 03/23/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 03/23/2024 8 AM 20 Good Warner and Armstrong 03/23/2024 8 AM 14 Good Warner Avenue 03/23/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, March, 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/24/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 03/24/2024 8 AM 4 Good Hangar Fenceline - E Side 03/24/2024 8 AM 6 Good Hangar Fenceline - N Center 03/24/2024 8 AM 2 Good Hangar Fenceline - N Corner 03/24/2024 8 AM 6 Good Hangar Fenceline - NE Corner 03/24/2024 8 AM 6 Good Hangar Fenceline - NE Side 03/24/2024 8 AM 7 Good Hangar Fenceline - S Corner 03/24/2024 8 AM 6 Good Hangar Fenceline - S Side 03/24/2024 8 AM 7 Good Hangar Fenceline - SW Corner 03/24/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/24/2024 8 AM Particulate Matter • 8 Level of Concern Good Hangar Fenceline - W Side 03/24/2024 8 AM 7 Good Heritage Elementary 03/24/2024 8 AM 5 Good Legacy Academy 03/24/2024 8 AM 8 Good Legacy Road 03/24/2024 8 AM 5 Good Moffett and Tustin Ranch 03/24/2024 8 AM 11 Good OC Animal Shelter 03/24/2024 8 AM 10 Good Valencia and Armstrong 03/24/2024 8 AM 5 Good Valencia and Columbus Square 03/24/2024 8 AM 5 Good Valencia and Legacy 03/24/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 03/24/2024 8 AM 10 Good Warner and Armstrong 03/24/2024 8 AM 3 Good Warner Avenue 03/24/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, March, 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/25/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 03/25/2024 8 AM 5 Good Hangar Fenceline - E Side 03/25/2024 8 AM 6 Good Hangar Fenceline - N Center 03/25/2024 8 AM 3 Good Hangar Fenceline - N Corner 03/25/2024 8 AM 5 Good Hangar Fenceline - NE Corner 03/25/2024 8 AM 4 Good Hangar Fenceline - NE Side 03/25/2024 8 AM 8 Good Hangar Fenceline - S Corner 03/25/2024 8 AM 7 Good Hangar Fenceline - S Side 03/25/2024 8 AM 7 Good Hangar Fenceline - SW Corner 03/25/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/25/2024 8 AM Particulate Matter 8 Level of Concern Good Hangar Fenceline - W Side 03/25/2024 8 AM 5 Good Heritage Elementary 03/25/2024 8 AM 5 Good Legacy Academy 03/25/2024 8 AM 8 Good Legacy Road 03/25/2024 8 AM 3 Good Moffett and Tustin Ranch 03/25/2024 8 AM 14 Good OC Animal Shelter 03/25/2024 8 AM 7 Good Valencia and Armstrong 03/25/2024 8 AM 4 Good Valencia and Columbus Square 03/25/2024 8 AM 5 Good Valencia and Legacy 03/25/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 03/25/2024 8 AM 9 Good Warner and Armstrong 03/25/2024 8 AM 3 Good Warner Avenue 03/25/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, March, 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/26/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 03/26/2024 8 AM 6 Good Hangar Fenceline - E Side 03/26/2024 8 AM 6 Good Hangar Fenceline - N Center 03/26/2024 8 AM 4 Good Hangar Fenceline - N Corner 03/26/2024 8 AM 6 Good Hangar Fenceline - NE Corner 03/26/2024 8 AM 7 Good Hangar Fenceline - NE Side 03/26/2024 8 AM 8 Good Hangar Fenceline - S Corner 03/26/2024 8 AM 7 Good Hangar Fenceline - S Side 03/26/2024 8 AM 11 Good Hangar Fenceline - SW Corner 03/26/2024 8 AM 4 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/26/2024 8 AM Particulate Matter • 7 Level of Concern Good Hangar Fenceline - W Side 03/26/2024 8 AM 7 Good Heritage Elementary 03/26/2024 8 AM 4 Good Legacy Academy 03/26/2024 8 AM 11 Good Legacy Road 03/26/2024 8 AM 5 Good Moffett and Tustin Ranch 03/26/2024 8 AM 21 Good OC Animal Shelter 03/26/2024 8 AM 8 Good Valencia and Armstrong 03/26/2024 8 AM 5 Good Valencia and Columbus Square 03/26/2024 8 AM 5 Good Valencia and Legacy 03/26/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 03/26/2024 8 AM 12 Good Warner and Armstrong 03/26/2024 8 AM 5 Good Warner Avenue 03/26/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, March, 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/27/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 03/27/2024 8 AM 8 Good Hangar Fenceline - E Side 03/27/2024 8 AM 11 Good Hangar Fenceline - N Center 03/27/2024 8 AM 6 Good Hangar Fenceline - N Corner 03/27/2024 8 AM 10 Good Hangar Fenceline - NE Corner 03/27/2024 8 AM 9 Good Hangar Fenceline - NE Side 03/27/2024 8 AM 15 Good Hangar Fenceline - S Corner 03/27/2024 8 AM 10 Good Hangar Fenceline - S Side 03/27/2024 8 AM 14 Good Hangar Fenceline - SW Corner 03/27/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/27/2024 8 AM Particulate Matter • 11 Level of Concern Good Hangar Fenceline - W Side 03/27/2024 8 AM 11 Good Heritage Elementary 03/27/2024 8 AM 8 Good Legacy Academy 03/27/2024 8 AM 13 Good Legacy Road 03/27/2024 8 AM 9 Good Moffett and Tustin Ranch 03/27/2024 8 AM 22 Good OC Animal Shelter 03/27/2024 8 AM 15 Good Valencia and Armstrong 03/27/2024 8 AM 8 Good Valencia and Columbus Square 03/27/2024 8 AM 7 Good Valencia and Legacy 03/27/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 03/27/2024 8 AM 17 Good Warner and Armstrong 03/27/2024 8 AM 8 Good Warner Avenue 03/27/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, March, 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/28/2024 8 AM Matter 10 Level of Concern Good Fire Station 37 03/28/2024 8 AM 13 Good Hangar Fenceline - E Side 03/28/2024 8 AM 16 Good Hangar Fenceline - N Center 03/28/2024 8 AM 10 Good Hangar Fenceline - N Corner 03/28/2024 8 AM 15 Good Hangar Fenceline - NE Corner 03/28/2024 8 AM 14 Good Hangar Fenceline - NE Side 03/28/2024 8 AM 20 Good Hangar Fenceline - S Corner 03/28/2024 8 AM 15 Good Hangar Fenceline - S Side 03/28/2024 8 AM 20 Good Hangar Fenceline - SW Corner 03/28/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/28/2024 8 AM Particulate Matter • 20 Level of Concern Good Hangar Fenceline - W Side 03/28/2024 8 AM 16 Good Heritage Elementary 03/28/2024 8 AM 13 Good Legacy Academy 03/28/2024 8 AM 18 Good Legacy Road 03/28/2024 8 AM 16 Good Moffett and Tustin Ranch 03/28/2024 8 AM 27 Good OC Animal Shelter 03/28/2024 8 AM 17 Good Valencia and Armstrong 03/28/2024 8 AM 13 Good Valencia and Columbus Square 03/28/2024 8 AM 12 Good Valencia and Legacy 03/28/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 03/28/2024 8 AM 23 Good Warner and Armstrong 03/28/2024 8 AM 15 Good Warner Avenue 03/28/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, March, 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very UnhealthyHazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/29/2024 8 AM • 9 Good Fire Station 37 03/29/2024 8 AM 10 Good Hangar Fenceline - E Side 03/29/2024 8 AM 12 Good Hangar Fenceline - N Center 03/29/2024 8 AM 9 Good Hangar Fenceline - N Corner 03/29/2024 8 AM 12 Good Hangar Fenceline - NE Corner 03/29/2024 8 AM 12 Good Hangar Fenceline - NE Side 03/29/2024 8 AM 15 Good Hangar Fenceline - S Corner 03/29/2024 8 AM 12 Good Hangar Fenceline - S Side 03/29/2024 8 AM 16 Good Hangar Fenceline - SW Corner 03/29/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/29/2024 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - W Side 03/29/2024 8 AM 13 Good Heritage Elementary 03/29/2024 8 AM 10 Good Legacy Academy 03/29/2024 8 AM 15 Good Legacy Road 03/29/2024 8 AM 11 Good Moffett and Tustin Ranch 03/29/2024 8 AM 25 Good OC Animal Shelter 03/29/2024 8 AM 17 Good Valencia and Armstrong 03/29/2024 8 AM 10 Good Valencia and Columbus Square 03/29/2024 8 AM 10 Good Valencia and Legacy 03/29/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 03/29/2024 8 AM 20 Good Warner and Armstrong 03/29/2024 8 AM 11 Good Warner Avenue 03/29/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health ed veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, March, 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/30/2024 8 AM Matter 3 Level of Concern Good Fire Station 37 03/30/2024 8 AM 6 Good Hangar Fenceline - E Side 03/30/2024 8 AM 5 Good Hangar Fenceline - N Center 03/30/2024 8 AM 5 Good Hangar Fenceline - N Corner 03/30/2024 8 AM 5 Good Hangar Fenceline - NE Corner 03/30/2024 8 AM 7 Good Hangar Fenceline - NE Side 03/30/2024 8 AM 6 Good Hangar Fenceline - S Corner 03/30/2024 8 AM 5 Good Hangar Fenceline - S Side 03/30/2024 8 AM 9 Good Hangar Fenceline - SW Corner 03/30/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/30/2024 8 AM Particulate Matter 7 Level of Concern Good Hangar Fenceline - W Side 03/30/2024 8 AM 6 Good Heritage Elementary 03/30/2024 8 AM 4 Good Legacy Academy 03/30/2024 8 AM 7 Good Legacy Road 03/30/2024 8 AM 4 Good Moffett and Tustin Ranch 03/30/2024 8 AM 14 Good OC Animal Shelter 03/30/2024 8 AM 8 Good Valencia and Armstrong 03/30/2024 8 AM 4 Good Valencia and Columbus Square 03/30/2024 8 AM 4 Good Valencia and Legacy 03/30/2024 8 AM 6 Good Victory and Tustin Ranch Rd. 03/30/2024 8 AM 10 Good Warner and Armstrong 03/30/2024 8 AM 5 Good Warner Avenue 03/30/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, March, 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/31/2024 8 AM Matter 3 Level of Concern Good Fire Station 37 03/31/2024 8 AM 3 Good Hangar Fenceline - E Side 03/31/2024 8 AM 3 Good Hangar Fenceline - N Center 03/31/2024 8 AM 4 Good Hangar Fenceline - N Corner 03/31/2024 8 AM 3 Good Hangar Fenceline - NE Corner 03/31/2024 8 AM 5 Good Hangar Fenceline - NE Side 03/31/2024 8 AM 4 Good Hangar Fenceline - S Corner 03/31/2024 8 AM 3 Good Hangar Fenceline - S Side 03/31/2024 8 AM 4 Good Hangar Fenceline - SW Corner 03/31/2024 8 AM 3 Good • •24-Hour Hangar Fenceline - SW Side Period • • 03/31/2024 8 AM Particulate Matter • 5 Level of Concern Good Hangar Fenceline - W Side 03/31/2024 8 AM 5 Good Heritage Elementary 03/31/2024 8 AM 3 Good Legacy Academy 03/31/2024 8 AM 5 Good Legacy Road 03/31/2024 8 AM 3 Good Moffett and Tustin Ranch 03/31/2024 8 AM 7 Good OC Animal Shelter 03/31/2024 8 AM 7 Good Valencia and Armstrong 03/31/2024 8 AM 3 Good Valencia and Columbus Square 03/31/2024 8 AM 3 Good Valencia and Legacy 03/31/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 03/31/2024 8 AM 6 Good Warner and Armstrong 03/31/2024 8 AM 3 Good Warner Avenue 03/31/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, April, 01, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/01/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 04/01/2024 8 AM 5 Good Hangar Fenceline - E Side 04/01/2024 8 AM 8 Good Hangar Fenceline - N Center 04/01/2024 8 AM 6 Good Hangar Fenceline - N Corner 04/01/2024 8 AM 7 Good Hangar Fenceline - NE Corner 04/01/2024 8 AM 6 Good Hangar Fenceline - NE Side 04/01/2024 8 AM 6 Good Hangar Fenceline - S Corner 04/01/2024 8 AM 6 Good Hangar Fenceline - S Side 04/01/2024 8 AM 6 Good Hangar Fenceline - SW Corner 04/01/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/01/2024 8 AM Particulate Matter 8 Level of Concern Good Hangar Fenceline - W Side 04/01/2024 8 AM 6 Good Heritage Elementary 04/01/2024 8 AM 7 Good Legacy Academy 04/01/2024 8 AM 7 Good Legacy Road 04/01/2024 8 AM 7 Good Moffett and Tustin Ranch 04/01/2024 8 AM 20 Good OC Animal Shelter 04/01/2024 8 AM 7 Good Valencia and Armstrong 04/01/2024 8 AM 6 Good Valencia and Columbus Square 04/01/2024 8 AM 6 Good Valencia and Legacy 04/01/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 04/01/2024 8 AM 7 Good Warner and Armstrong 04/01/2024 8 AM 6 Good Warner Avenue 04/01/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, April, 02, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/02/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 04/02/2024 8 AM 7 Good Hangar Fenceline - E Side 04/02/2024 8 AM 6 Good Hangar Fenceline - N Center 04/02/2024 8 AM 6 Good Hangar Fenceline - N Corner 04/02/2024 8 AM 6 Good Hangar Fenceline - NE Corner 04/02/2024 8 AM 6 Good Hangar Fenceline - NE Side 04/02/2024 8 AM 11 Good Hangar Fenceline - S Corner 04/02/2024 8 AM 6 Good Hangar Fenceline - S Side 04/02/2024 8 AM 10 Good Hangar Fenceline - SW Corner ** ** ** • •24-Hour Hangar Fenceline - SW Side Period • • 04/02/2024 8 AM Particulate Matter • 10 Level of Concern Good Hangar Fenceline - W Side 04/02/2024 8 AM 6 Good Heritage Elementary 04/02/2024 8 AM 6 Good Legacy Academy 04/02/2024 8 AM 8 Good Legacy Road 04/02/2024 8 AM 5 Good Moffett and Tustin Ranch 04/02/2024 8 AM 17 Good OC Animal Shelter 04/02/2024 8 AM 8 Good Valencia and Armstrong 04/02/2024 8 AM 5 Good Valencia and Columbus Square 04/02/2024 8 AM 5 Good Valencia and Legacy 04/02/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 04/02/2024 8 AM 8 Good Warner and Armstrong 04/02/2024 8 AM 7 Good Warner Avenue 04/02/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, April, 03, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/03/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 04/03/2024 8 AM 11 Good Hangar Fenceline - E Side 04/03/2024 8 AM 12 Good Hangar Fenceline - N Center 04/03/2024 8 AM 9 Good Hangar Fenceline - N Corner 04/03/2024 8 AM 11 Good Hangar Fenceline - NE Corner 04/03/2024 8 AM 9 Good Hangar Fenceline - NE Side 04/03/2024 8 AM 13 Good Hangar Fenceline - S Corner 04/03/2024 8 AM 11 Good Hangar Fenceline - S Side 04/03/2024 8 AM 15 Good Hangar Fenceline - SW Corner 04/03/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/03/2024 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - W Side 04/03/2024 8 AM 12 Good Heritage Elementary 04/03/2024 8 AM 9 Good Legacy Academy 04/03/2024 8 AM 14 Good Legacy Road 04/03/2024 8 AM 11 Good Moffett and Tustin Ranch 04/03/2024 8 AM 31 Good OC Animal Shelter 04/03/2024 8 AM 14 Good Valencia and Armstrong 04/03/2024 8 AM 9 Good Valencia and Columbus Square 04/03/2024 8 AM 8 Good Valencia and Legacy 04/03/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 04/03/2024 8 AM 15 Good Warner and Armstrong 04/03/2024 8 AM 12 Good Warner Avenue 04/03/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, April, 04, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/04/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 04/04/2024 8 AM 12 Good Hangar Fenceline - E Side 04/04/2024 8 AM 13 Good Hangar Fenceline - N Center 04/04/2024 8 AM 9 Good Hangar Fenceline - N Corner 04/04/2024 8 AM 12 Good Hangar Fenceline - NE Corner 04/04/2024 8 AM 11 Good Hangar Fenceline - NE Side 04/04/2024 8 AM 13 Good Hangar Fenceline - S Corner 04/04/2024 8 AM 13 Good Hangar Fenceline - S Side 04/04/2024 8 AM 16 Good Hangar Fenceline - SW Corner 04/04/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/04/2024 8 AM Particulate Matter 13 Level of Concern Good Hangar Fenceline - W Side 04/04/2024 8 AM 13 Good Heritage Elementary 04/04/2024 8 AM 10 Good Legacy Academy 04/04/2024 8 AM 17 Good Legacy Road 04/04/2024 8 AM 13 Good Moffett and Tustin Ranch 04/04/2024 8 AM 26 Good OC Animal Shelter 04/04/2024 8 AM 6 Good Valencia and Armstrong 04/04/2024 8 AM 11 Good Valencia and Columbus Square 04/04/2024 8 AM 10 Good Valencia and Legacy 04/04/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 04/04/2024 8 AM 17 Good Warner and Armstrong 04/04/2024 8 AM 15 Good Warner Avenue 04/04/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, April, 05, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/05/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 04/05/2024 8 AM 4 Good Hangar Fenceline - E Side 04/05/2024 8 AM 5 Good Hangar Fenceline - N Center 04/05/2024 8 AM 3 Good Hangar Fenceline - N Corner 04/05/2024 8 AM 5 Good Hangar Fenceline - NE Corner 04/05/2024 8 AM 5 Good Hangar Fenceline - NE Side 04/05/2024 8 AM 6 Good Hangar Fenceline - S Corner 04/05/2024 8 AM 6 Good Hangar Fenceline - S Side 04/05/2024 8 AM 6 Good Hangar Fenceline - SW Corner 04/05/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/05/2024 8 AM Particulate Matter 6 Level of Concern Good Hangar Fenceline - W Side 04/05/2024 8 AM 5 Good Heritage Elementary 04/05/2024 8 AM 4 Good Legacy Academy 04/05/2024 8 AM 6 Good Legacy Road 04/05/2024 8 AM 5 Good Moffett and Tustin Ranch 04/05/2024 8 AM 11 Good OC Animal Shelter 04/05/2024 8 AM 10 Good Valencia and Armstrong 04/05/2024 8 AM 4 Good Valencia and Columbus Square 04/05/2024 8 AM 4 Good Valencia and Legacy 04/05/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 04/05/2024 8 AM 8 Good Warner and Armstrong 04/05/2024 8 AM 4 Good Warner Avenue 04/05/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, April, 06, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/06/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 04/06/2024 8 AM 4 Good Hangar Fenceline - E Side 04/06/2024 8 AM 6 Good Hangar Fenceline - N Center 04/06/2024 8 AM 3 Good Hangar Fenceline - N Corner 04/06/2024 8 AM 5 Good Hangar Fenceline - NE Corner 04/06/2024 8 AM 7 Good Hangar Fenceline - NE Side 04/06/2024 8 AM ** ** Hangar Fenceline - S Corner 04/06/2024 8 AM 5 Good Hangar Fenceline - S Side 04/06/2024 8 AM 7 Good Hangar Fenceline - SW Corner 04/06/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/06/2024 8 AM Particulate Matter 6 Level of Concern Good Hangar Fenceline - W Side 04/06/2024 8 AM 6 Good Heritage Elementary 04/06/2024 8 AM 4 Good Legacy Academy 04/06/2024 8 AM 7 Good Legacy Road 04/06/2024 8 AM 4 Good Moffett and Tustin Ranch 04/06/2024 8 AM 15 Good OC Animal Shelter 04/06/2024 8 AM 11 Good Valencia and Armstrong 04/06/2024 8 AM 4 Good Valencia and Columbus Square 04/06/2024 8 AM 4 Good Valencia and Legacy 04/06/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 04/06/2024 8 AM 8 Good Warner and Armstrong 04/06/2024 8 AM 4 Good Warner Avenue 04/06/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, April, 07, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/07/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 04/07/2024 8 AM 6 Good Hangar Fenceline - E Side 04/07/2024 8 AM 6 Good Hangar Fenceline - N Center 04/07/2024 8 AM 4 Good Hangar Fenceline - N Corner 04/07/2024 8 AM 6 Good Hangar Fenceline - NE Corner 04/07/2024 8 AM 5 Good Hangar Fenceline - NE Side 04/07/2024 8 AM 6 Good Hangar Fenceline - S Corner 04/07/2024 8 AM 6 Good Hangar Fenceline - S Side 04/07/2024 8 AM 10 Good Hangar Fenceline - SW Corner 04/07/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/07/2024 8 AM Particulate Matter • 6 Level of Concern Good Hangar Fenceline - W Side 04/07/2024 8 AM 6 Good Heritage Elementary 04/07/2024 8 AM 5 Good Legacy Academy 04/07/2024 8 AM 8 Good Legacy Road 04/07/2024 8 AM 5 Good Moffett and Tustin Ranch 04/07/2024 8 AM 18 Good OC Animal Shelter 04/07/2024 8 AM 7 Good Valencia and Armstrong 04/07/2024 8 AM 5 Good Valencia and Columbus Square 04/07/2024 8 AM 5 Good Valencia and Legacy 04/07/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 04/07/2024 8 AM 8 Good Warner and Armstrong 04/07/2024 8 AM 7 Good Warner Avenue 04/07/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, April, 08, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/08/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 04/08/2024 8 AM 7 Good Hangar Fenceline - E Side 04/08/2024 8 AM 8 Good Hangar Fenceline - N Center 04/08/2024 8 AM 5 Good Hangar Fenceline - N Corner 04/08/2024 8 AM 7 Good Hangar Fenceline - NE Corner 04/08/2024 8 AM 7 Good Hangar Fenceline - NE Side 04/08/2024 8 AM 8 Good Hangar Fenceline - S Corner 04/08/2024 8 AM 7 Good Hangar Fenceline - S Side 04/08/2024 8 AM 10 Good Hangar Fenceline - SW Corner 04/08/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/08/2024 8 AM Particulate Matter • 8 Level of Concern Good Hangar Fenceline - W Side 04/08/2024 8 AM 7 Good Heritage Elementary 04/08/2024 8 AM 6 Good Legacy Academy 04/08/2024 8 AM 10 Good Legacy Road 04/08/2024 8 AM 7 Good Moffett and Tustin Ranch 04/08/2024 8 AM 20 Good OC Animal Shelter 04/08/2024 8 AM 7 Good Valencia and Armstrong 04/08/2024 8 AM 6 Good Valencia and Columbus Square 04/08/2024 8 AM 6 Good Valencia and Legacy 04/08/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 04/08/2024 8 AM 10 Good Warner and Armstrong 04/08/2024 8 AM 7 Good Warner Avenue 04/08/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, April, 09, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/09/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 04/09/2024 8 AM 9 Good Hangar Fenceline - E Side 04/09/2024 8 AM 9 Good Hangar Fenceline - N Center 04/09/2024 8 AM 5 Good Hangar Fenceline - N Corner 04/09/2024 8 AM 10 Good Hangar Fenceline - NE Corner 04/09/2024 8 AM 10 Good Hangar Fenceline - NE Side 04/09/2024 8 AM 11 Good Hangar Fenceline - S Corner 04/09/2024 8 AM 10 Good Hangar Fenceline - S Side 04/09/2024 8 AM 14 Good Hangar Fenceline - SW Corner 04/09/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/09/2024 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - W Side 04/09/2024 8 AM 11 Good Heritage Elementary 04/09/2024 8 AM 8 Good Legacy Academy 04/09/2024 8 AM 14 Good Legacy Road 04/09/2024 8 AM 9 Good Moffett and Tustin Ranch 04/09/2024 8 AM 26 Good OC Animal Shelter 04/09/2024 8 AM 12 Good Valencia and Armstrong 04/09/2024 8 AM 8 Good Valencia and Columbus Square 04/09/2024 8 AM 8 Good Valencia and Legacy 04/09/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 04/09/2024 8 AM 15 Good Warner and Armstrong 04/09/2024 8 AM 10 Good Warner Avenue 04/09/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, April, 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/10/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 04/10/2024 8 AM 10 Good Hangar Fenceline - E Side 04/10/2024 8 AM 7 Good Hangar Fenceline - N Center 04/10/2024 8 AM 7 Good Hangar Fenceline - N Corner 04/10/2024 8 AM 9 Good Hangar Fenceline - NE Corner 04/10/2024 8 AM 9 Good Hangar Fenceline - NE Side 04/10/2024 8 AM 11 Good Hangar Fenceline - S Corner 04/10/2024 8 AM 9 Good Hangar Fenceline - S Side 04/10/2024 8 AM 12 Good Hangar Fenceline - SW Corner 04/10/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/10/2024 8 AM Particulate Matter • 9 Level of Concern Good Hangar Fenceline - W Side 04/10/2024 8 AM 9 Good Heritage Elementary 04/10/2024 8 AM 6 Good Legacy Academy 04/10/2024 8 AM 12 Good Legacy Road 04/10/2024 8 AM 7 Good Moffett and Tustin Ranch 04/10/2024 8 AM 24 Good OC Animal Shelter 04/10/2024 8 AM 10 Good Valencia and Armstrong 04/10/2024 8 AM 6 Good Valencia and Columbus Square 04/10/2024 8 AM 6 Good Valencia and Legacy 04/10/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 04/10/2024 8 AM 12 Good Warner and Armstrong 04/10/2024 8 AM 9 Good Warner Avenue 04/10/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, April, 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/11/2024 8 AM Matter 10 Level of Concern Good Fire Station 37 04/11/2024 8 AM 14 Good Hangar Fenceline - E Side 04/11/2024 8 AM 16 Good Hangar Fenceline - N Center 04/11/2024 8 AM 6 Good Hangar Fenceline - N Corner 04/11/2024 8 AM 16 Good Hangar Fenceline - NE Corner 04/11/2024 8 AM 16 Good Hangar Fenceline - NE Side 04/11/2024 8 AM 18 Good Hangar Fenceline - S Corner 04/11/2024 8 AM 17 Good Hangar Fenceline - S Side 04/11/2024 8 AM 20 Good Hangar Fenceline - SW Corner 04/11/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/11/2024 8 AM Particulate Matter • 18 Level of Concern Good Hangar Fenceline - W Side 04/11/2024 8 AM 17 Good Heritage Elementary 04/11/2024 8 AM 12 Good Legacy Academy 04/11/2024 8 AM 22 Good Legacy Road 04/11/2024 8 AM 17 Good Moffett and Tustin Ranch 04/11/2024 8 AM 37 Good OC Animal Shelter 04/11/2024 8 AM 22 Good Valencia and Armstrong 04/11/2024 8 AM 13 Good Valencia and Columbus Square 04/11/2024 8 AM 12 Good Valencia and Legacy 04/11/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 04/11/2024 8 AM 22 Good Warner and Armstrong 04/11/2024 8 AM 17 Good Warner Avenue 04/11/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, April, 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/12/2024 8 AM Matter 24 Level of Concern Good Fire Station 37 04/12/2024 8 AM 27 Good Hangar Fenceline - E Side 04/12/2024 8 AM 32 Good Hangar Fenceline - N Center 04/12/2024 8 AM 19 Good Hangar Fenceline - N Corner 04/12/2024 8 AM 31 Good Hangar Fenceline - NE Corner 04/12/2024 8 AM 30 Good Hangar Fenceline - NE Side 04/12/2024 8 AM 32 Good Hangar Fenceline - S Corner 04/12/2024 8 AM 32 Good Hangar Fenceline - S Side 04/12/2024 8 AM 36 Good Hangar Fenceline - SW Corner 04/12/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/12/2024 8 AM Particulate Matter • 31 Level of Concern Good Hangar Fenceline - W Side 04/12/2024 8 AM 31 Good Heritage Elementary 04/12/2024 8 AM 28 Good Legacy Academy 04/12/2024 8 AM 37 Good Legacy Road 04/12/2024 8 AM 34 Good Moffett and Tustin Ranch 04/12/2024 8 AM 42 Good OC Animal Shelter 04/12/2024 8 AM 33 Good Valencia and Armstrong 04/12/2024 8 AM 30 Good Valencia and Columbus Square 04/12/2024 8 AM 28 Good Valencia and Legacy 04/12/2024 8 AM 37 Good Victory and Tustin Ranch Rd. 04/12/2024 8 AM 35 Good Warner and Armstrong 04/12/2024 8 AM 35 Good Warner Avenue 04/12/2024 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, April, 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/13/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 04/13/2024 8 AM 9 Good Hangar Fenceline - E Side 04/13/2024 8 AM 11 Good Hangar Fenceline - N Center 04/13/2024 8 AM 7 Good Hangar Fenceline - N Corner 04/13/2024 8 AM 12 Good Hangar Fenceline - NE Corner 04/13/2024 8 AM 12 Good Hangar Fenceline - NE Side 04/13/2024 8 AM 13 Good Hangar Fenceline - S Corner 04/13/2024 8 AM 12 Good Hangar Fenceline - S Side 04/13/2024 8 AM 14 Good Hangar Fenceline - SW Corner 04/13/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/13/2024 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - W Side 04/13/2024 8 AM 13 Good Heritage Elementary 04/13/2024 8 AM 10 Good Legacy Academy 04/13/2024 8 AM 15 Good Legacy Road 04/13/2024 8 AM 13 Good Moffett and Tustin Ranch 04/13/2024 8 AM 20 Good OC Animal Shelter 04/13/2024 8 AM 15 Good Valencia and Armstrong 04/13/2024 8 AM 10 Good Valencia and Columbus Square 04/13/2024 8 AM 10 Good Valencia and Legacy 04/13/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 04/13/2024 8 AM 18 Good Warner and Armstrong 04/13/2024 8 AM 11 Good Warner Avenue 04/13/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, April, 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/14/2024 8 AM Matter 4 Level of Concern Good Fire Station 37 04/14/2024 8 AM 4 Good Hangar Fenceline - E Side 04/14/2024 8 AM 6 Good Hangar Fenceline - N Center 04/14/2024 8 AM 2 Good Hangar Fenceline - N Corner 04/14/2024 8 AM 5 Good Hangar Fenceline - NE Corner 04/14/2024 8 AM 5 Good Hangar Fenceline - NE Side 04/14/2024 8 AM ** ** Hangar Fenceline - S Corner 04/14/2024 8 AM 7 Good Hangar Fenceline - S Side 04/14/2024 8 AM 7 Good Hangar Fenceline - SW Corner 04/14/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/14/2024 8 AM Particulate Matter • 6 Level of Concern Good Hangar Fenceline - W Side 04/14/2024 8 AM 6 Good Heritage Elementary 04/14/2024 8 AM 4 Good Legacy Academy 04/14/2024 8 AM 5 Good Legacy Road 04/14/2024 8 AM 6 Good Moffett and Tustin Ranch 04/14/2024 8 AM 19 Good OC Animal Shelter 04/14/2024 8 AM 7 Good Valencia and Armstrong 04/14/2024 8 AM 4 Good Valencia and Columbus Square 04/14/2024 8 AM 4 Good Valencia and Legacy 04/14/2024 8 AM 6 Good Victory and Tustin Ranch Rd. 04/14/2024 8 AM 7 Good Warner and Armstrong 04/14/2024 8 AM 4 Good Warner Avenue 04/14/2024 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, April, 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/15/2024 8 AM Matter 2 Level of Concern Good Fire Station 37 04/15/2024 8 AM 3 Good Hangar Fenceline - E Side 04/15/2024 8 AM 4 Good Hangar Fenceline - N Center 04/15/2024 8 AM 2 Good Hangar Fenceline - N Corner 04/15/2024 8 AM 4 Good Hangar Fenceline - NE Corner 04/15/2024 8 AM 4 Good Hangar Fenceline - NE Side 04/15/2024 8 AM 5 Good Hangar Fenceline - S Corner 04/15/2024 8 AM 4 Good Hangar Fenceline - S Side 04/15/2024 8 AM 7 Good Hangar Fenceline - SW Corner 04/15/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/15/2024 8 AM Particulate Matter • 5 Level of Concern Good Hangar Fenceline - W Side 04/15/2024 8 AM 5 Good Heritage Elementary 04/15/2024 8 AM 3 Good Legacy Academy 04/15/2024 8 AM 6 Good Legacy Road 04/15/2024 8 AM 3 Good Moffett and Tustin Ranch 04/15/2024 8 AM 13 Good OC Animal Shelter 04/15/2024 8 AM 21 Good Valencia and Armstrong 04/15/2024 8 AM 3 Good Valencia and Columbus Square 04/15/2024 8 AM 3 Good Valencia and Legacy 04/15/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 04/15/2024 8 AM 6 Good Warner and Armstrong 04/15/2024 8 AM 5 Good Warner Avenue 04/15/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, April, 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/16/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 04/16/2024 8 AM 8 Good Hangar Fenceline - E Side 04/16/2024 8 AM 9 Good Hangar Fenceline - N Center 04/16/2024 8 AM 5 Good Hangar Fenceline - N Corner 04/16/2024 8 AM 8 Good Hangar Fenceline - NE Corner 04/16/2024 8 AM 8 Good Hangar Fenceline - NE Side 04/16/2024 8 AM 10 Good Hangar Fenceline - S Corner 04/16/2024 8 AM 9 Good Hangar Fenceline - S Side 04/16/2024 8 AM 9 Good Hangar Fenceline - SW Corner 04/16/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/16/2024 8 AM Particulate Matter • 9 Level of Concern Good Hangar Fenceline - W Side 04/16/2024 8 AM 9 Good Heritage Elementary 04/16/2024 8 AM 7 Good Legacy Academy 04/16/2024 8 AM 11 Good Legacy Road 04/16/2024 8 AM 9 Good Moffett and Tustin Ranch 04/16/2024 8 AM 14 Good OC Animal Shelter 04/16/2024 8 AM 9 Good Valencia and Armstrong 04/16/2024 8 AM 7 Good Valencia and Columbus Square 04/16/2024 8 AM 8 Good Valencia and Legacy 04/16/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 04/16/2024 8 AM 10 Good Warner and Armstrong 04/16/2024 8 AM 10 Good Warner Avenue 04/16/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, April, 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/17/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 04/17/2024 8 AM 13 Good Hangar Fenceline - E Side 04/17/2024 8 AM 14 Good Hangar Fenceline - N Center 04/17/2024 8 AM 9 Good Hangar Fenceline - N Corner 04/17/2024 8 AM 14 Good Hangar Fenceline - NE Corner 04/17/2024 8 AM 14 Good Hangar Fenceline - NE Side 04/17/2024 8 AM 14 Good Hangar Fenceline - S Corner 04/17/2024 8 AM 14 Good Hangar Fenceline - S Side 04/17/2024 8 AM 16 Good Hangar Fenceline - SW Corner 04/17/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/17/2024 8 AM Particulate Matter 15 Level of Concern Good Hangar Fenceline - W Side 04/17/2024 8 AM 14 Good Heritage Elementary 04/17/2024 8 AM 12 Good Legacy Academy 04/17/2024 8 AM 18 Good Legacy Road 04/17/2024 8 AM 14 Good Moffett and Tustin Ranch 04/17/2024 8 AM 18 Good OC Animal Shelter 04/17/2024 8 AM ** ** Valencia and Armstrong 04/17/2024 8 AM 12 Good Valencia and Columbus Square 04/17/2024 8 AM 12 Good Valencia and Legacy 04/17/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 04/17/2024 8 AM 17 Good Warner and Armstrong 04/17/2024 8 AM 19 Good Warner Avenue 04/17/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, April, 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/18/2024 8 AM Matter 10 Level of Concern Good Fire Station 37 04/18/2024 8 AM 13 Good Hangar Fenceline - E Side 04/18/2024 8 AM 16 Good Hangar Fenceline - N Center 04/18/2024 8 AM 7 Good Hangar Fenceline - N Corner 04/18/2024 8 AM 15 Good Hangar Fenceline - NE Corner 04/18/2024 8 AM 16 Good Hangar Fenceline - NE Side 04/18/2024 8 AM 15 Good Hangar Fenceline - S Corner 04/18/2024 8 AM 16 Good Hangar Fenceline - S Side 04/18/2024 8 AM 18 Good Hangar Fenceline - SW Corner 04/18/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/18/2024 8 AM Particulate Matter • 16 Level of Concern Good Hangar Fenceline - W Side 04/18/2024 8 AM 16 Good Heritage Elementary 04/18/2024 8 AM 12 Good Legacy Academy 04/18/2024 8 AM 20 Good Legacy Road 04/18/2024 8 AM 18 Good Moffett and Tustin Ranch 04/18/2024 8 AM 25 Good OC Animal Shelter 04/18/2024 8 AM 18 Good Valencia and Armstrong 04/18/2024 8 AM 12 Good Valencia and Columbus Square 04/18/2024 8 AM 12 Good Valencia and Legacy 04/18/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 04/18/2024 8 AM 21 Good Warner and Armstrong 04/18/2024 8 AM 19 Good Warner Avenue 04/18/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, April, 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/19/2024 8 AM Matter 11 Level of Concern Good Fire Station 37 04/19/2024 8 AM 12 Good Hangar Fenceline - E Side 04/19/2024 8 AM 14 Good Hangar Fenceline - N Center 04/19/2024 8 AM 7 Good Hangar Fenceline - N Corner 04/19/2024 8 AM 14 Good Hangar Fenceline - NE Corner 04/19/2024 8 AM 15 Good Hangar Fenceline - NE Side 04/19/2024 8 AM 17 Good Hangar Fenceline - S Corner 04/19/2024 8 AM 15 Good Hangar Fenceline - S Side 04/19/2024 8 AM 19 Good Hangar Fenceline - SW Corner 04/19/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/19/2024 8 AM Particulate Matter • 16 Level of Concern Good Hangar Fenceline - W Side 04/19/2024 8 AM 16 Good Heritage Elementary 04/19/2024 8 AM 11 Good Legacy Academy 04/19/2024 8 AM 18 Good Legacy Road 04/19/2024 8 AM 15 Good Moffett and Tustin Ranch 04/19/2024 8 AM 23 Good OC Animal Shelter 04/19/2024 8 AM 19 Good Valencia and Armstrong 04/19/2024 8 AM 12 Good Valencia and Columbus Square 04/19/2024 8 AM 12 Good Valencia and Legacy 04/19/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 04/19/2024 8 AM 19 Good Warner and Armstrong 04/19/2024 8 AM 14 Good Warner Avenue 04/19/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, April, 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/20/2024 8 AM Matter 11 Level of Concern Good Fire Station 37 04/20/2024 8 AM 13 Good Hangar Fenceline - E Side 04/20/2024 8 AM 15 Good Hangar Fenceline - N Center 04/20/2024 8 AM 8 Good Hangar Fenceline - N Corner 04/20/2024 8 AM 14 Good Hangar Fenceline - NE Corner 04/20/2024 8 AM 15 Good Hangar Fenceline - NE Side 04/20/2024 8 AM 17 Good Hangar Fenceline - S Corner 04/20/2024 8 AM 15 Good Hangar Fenceline - S Side 04/20/2024 8 AM 17 Good Hangar Fenceline - SW Corner 04/20/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/20/2024 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - W Side 04/20/2024 8 AM 16 Good Heritage Elementary 04/20/2024 8 AM 12 Good Legacy Academy 04/20/2024 8 AM 18 Good Legacy Road 04/20/2024 8 AM 15 Good Moffett and Tustin Ranch 04/20/2024 8 AM 22 Good OC Animal Shelter 04/20/2024 8 AM 18 Good Valencia and Armstrong 04/20/2024 8 AM 13 Good Valencia and Columbus Square 04/20/2024 8 AM 13 Good Valencia and Legacy 04/20/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 04/20/2024 8 AM 19 Good Warner and Armstrong 04/20/2024 8 AM 15 Good Warner Avenue 04/20/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, April, 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/21/2024 8 AM Matter 16 Level of Concern Good Fire Station 37 04/21/2024 8 AM 18 Good Hangar Fenceline - E Side 04/21/2024 8 AM 21 Good Hangar Fenceline - N Center 04/21/2024 8 AM 11 Good Hangar Fenceline - N Corner 04/21/2024 8 AM 21 Good Hangar Fenceline - NE Corner 04/21/2024 8 AM 21 Good Hangar Fenceline - NE Side 04/21/2024 8 AM 24 Good Hangar Fenceline - S Corner 04/21/2024 8 AM 20 Good Hangar Fenceline - S Side 04/21/2024 8 AM 24 Good Hangar Fenceline - SW Corner 04/21/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/21/2024 8 AM Particulate Matter • 22 Level of Concern Good Hangar Fenceline - W Side 04/21/2024 8 AM 21 Good Heritage Elementary 04/21/2024 8 AM 17 Good Legacy Academy 04/21/2024 8 AM 23 Good Legacy Road 04/21/2024 8 AM 21 Good Moffett and Tustin Ranch 04/21/2024 8 AM 29 Good OC Animal Shelter 04/21/2024 8 AM 25 Good Valencia and Armstrong 04/21/2024 8 AM 19 Good Valencia and Columbus Square 04/21/2024 8 AM 18 Good Valencia and Legacy 04/21/2024 8 AM 24 Good Victory and Tustin Ranch Rd. 04/21/2024 8 AM 24 Good Warner and Armstrong 04/21/2024 8 AM 22 Good Warner Avenue 04/21/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, April, 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/22/2024 8 AM Matter 28 Level of Concern Good Fire Station 37 04/22/2024 8 AM 32 Good Hangar Fenceline - E Side 04/22/2024 8 AM 38 Good Hangar Fenceline - N Center 04/22/2024 8 AM 20 Good Hangar Fenceline - N Corner 04/22/2024 8 AM 38 Good Hangar Fenceline - NE Corner 04/22/2024 8 AM 37 Good Hangar Fenceline - NE Side 04/22/2024 8 AM 41 Good Hangar Fenceline - S Corner 04/22/2024 8 AM 37 Good Hangar Fenceline - S Side 04/22/2024 8 AM 42 Good Hangar Fenceline - SW Corner 04/22/2024 8 AM 34 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/22/2024 8 AM Particulate Matter 38 Level of Concern Good Hangar Fenceline - W Side 04/22/2024 8 AM 40 Good Heritage Elementary 04/22/2024 8 AM 34 Good Legacy Academy 04/22/2024 8 AM 44 Good Legacy Road 04/22/2024 8 AM 39 Good Moffett and Tustin Ranch 04/22/2024 8 AM 43 Good OC Animal Shelter 04/22/2024 8 AM 40 Good Valencia and Armstrong 04/22/2024 8 AM 35 Good Valencia and Columbus Square 04/22/2024 8 AM 33 Good Valencia and Legacy 04/22/2024 8 AM 42 Good Victory and Tustin Ranch Rd. 04/22/2024 8 AM 41 Good Warner and Armstrong 04/22/2024 8 AM 38 Good Warner Avenue 04/22/2024 8 AM 35 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, April, 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/23/2024 8 AM Matter 11 Level of Concern Good Fire Station 37 04/23/2024 8 AM 11 Good Hangar Fenceline - E Side 04/23/2024 8 AM 14 Good Hangar Fenceline - N Center 04/23/2024 8 AM 7 Good Hangar Fenceline - N Corner 04/23/2024 8 AM 13 Good Hangar Fenceline - NE Corner 04/23/2024 8 AM 14 Good Hangar Fenceline - NE Side 04/23/2024 8 AM 15 Good Hangar Fenceline - S Corner 04/23/2024 8 AM 14 Good Hangar Fenceline - S Side 04/23/2024 8 AM 15 Good Hangar Fenceline - SW Corner 04/23/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/23/2024 8 AM Particulate Matter 14 Level of Concern Good Hangar Fenceline - W Side 04/23/2024 8 AM 14 Good Heritage Elementary 04/23/2024 8 AM 13 Good Legacy Academy 04/23/2024 8 AM 16 Good Legacy Road 04/23/2024 8 AM 14 Good Moffett and Tustin Ranch 04/23/2024 8 AM 17 Good OC Animal Shelter 04/23/2024 8 AM 16 Good Valencia and Armstrong 04/23/2024 8 AM 13 Good Valencia and Columbus Square 04/23/2024 8 AM 12 Good Valencia and Legacy 04/23/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 04/23/2024 8 AM 16 Good Warner and Armstrong 04/23/2024 8 AM 14 Good Warner Avenue 04/23/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, April, 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/24/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 04/24/2024 8 AM 8 Good Hangar Fenceline - E Side 04/24/2024 8 AM 9 Good Hangar Fenceline - N Center 04/24/2024 8 AM 9 Good Hangar Fenceline - N Corner 04/24/2024 8 AM 9 Good Hangar Fenceline - NE Corner 04/24/2024 8 AM 9 Good Hangar Fenceline - NE Side 04/24/2024 8 AM 11 Good Hangar Fenceline - S Corner 04/24/2024 8 AM 10 Good Hangar Fenceline - S Side 04/24/2024 8 AM 11 Good Hangar Fenceline - SW Corner 04/24/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/24/2024 8 AM Particulate Matter • 10 Level of Concern Good Hangar Fenceline - W Side 04/24/2024 8 AM 9 Good Heritage Elementary 04/24/2024 8 AM 7 Good Legacy Academy 04/24/2024 8 AM 11 Good Legacy Road 04/24/2024 8 AM 9 Good Moffett and Tustin Ranch 04/24/2024 8 AM 16 Good OC Animal Shelter 04/24/2024 8 AM 11 Good Valencia and Armstrong 04/24/2024 8 AM 7 Good Valencia and Columbus Square 04/24/2024 8 AM 7 Good Valencia and Legacy 04/24/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 04/24/2024 8 AM 13 Good Warner and Armstrong 04/24/2024 8 AM 10 Good Warner Avenue 04/24/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, April, 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/25/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 04/25/2024 8 AM 5 Good Hangar Fenceline - E Side 04/25/2024 8 AM 7 Good Hangar Fenceline - N Center 04/25/2024 8 AM 3 Good Hangar Fenceline - N Corner 04/25/2024 8 AM 7 Good Hangar Fenceline - NE Corner 04/25/2024 8 AM 7 Good Hangar Fenceline - NE Side 04/25/2024 8 AM 12 Good Hangar Fenceline - S Corner 04/25/2024 8 AM 7 Good Hangar Fenceline - S Side 04/25/2024 8 AM 9 Good Hangar Fenceline - SW Corner 04/25/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/25/2024 8 AM Particulate Matter 8 Level of Concern Good Hangar Fenceline - W Side 04/25/2024 8 AM 12 Good Heritage Elementary 04/25/2024 8 AM 5 Good Legacy Academy 04/25/2024 8 AM 9 Good Legacy Road 04/25/2024 8 AM 6 Good Moffett and Tustin Ranch 04/25/2024 8 AM 12 Good OC Animal Shelter 04/25/2024 8 AM 8 Good Valencia and Armstrong 04/25/2024 8 AM 5 Good Valencia and Columbus Square 04/25/2024 8 AM 6 Good Valencia and Legacy 04/25/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 04/25/2024 8 AM 10 Good Warner and Armstrong 04/25/2024 8 AM 10 Good Warner Avenue 04/25/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, April, 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/26/2024 8 AM Matter 3 Level of Concern Good Fire Station 37 04/26/2024 8 AM 3 Good Hangar Fenceline - E Side 04/26/2024 8 AM 4 Good Hangar Fenceline - N Center 04/26/2024 8 AM 6 Good Hangar Fenceline - N Corner 04/26/2024 8 AM 4 Good Hangar Fenceline - NE Corner 04/26/2024 8 AM 5 Good Hangar Fenceline - NE Side 04/26/2024 8 AM 6 Good Hangar Fenceline - S Corner 04/26/2024 8 AM 5 Good Hangar Fenceline - S Side 04/26/2024 8 AM 7 Good Hangar Fenceline - SW Corner 04/26/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/26/2024 8 AM Particulate Matter 5 Level of Concern Good Hangar Fenceline - W Side 04/26/2024 8 AM 5 Good Heritage Elementary 04/26/2024 8 AM 3 Good Legacy Academy 04/26/2024 8 AM 6 Good Legacy Road 04/26/2024 8 AM 4 Good Moffett and Tustin Ranch 04/26/2024 8 AM 12 Good OC Animal Shelter 04/26/2024 8 AM 6 Good Valencia and Armstrong 04/26/2024 8 AM 3 Good Valencia and Columbus Square 04/26/2024 8 AM 4 Good Valencia and Legacy 04/26/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 04/26/2024 8 AM 7 Good Warner and Armstrong 04/26/2024 8 AM 5 Good Warner Avenue 04/26/2024 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, April, 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/27/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 04/27/2024 8 AM 7 Good Hangar Fenceline - E Side 04/27/2024 8 AM 9 Good Hangar Fenceline - N Center 04/27/2024 8 AM 15 Good Hangar Fenceline - N Corner 04/27/2024 8 AM 10 Good Hangar Fenceline - NE Corner 04/27/2024 8 AM 11 Good Hangar Fenceline - NE Side 04/27/2024 8 AM 12 Good Hangar Fenceline - S Corner 04/27/2024 8 AM 10 Good Hangar Fenceline - S Side 04/27/2024 8 AM 13 Good Hangar Fenceline - SW Corner 04/27/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/27/2024 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - W Side 04/27/2024 8 AM 11 Good Heritage Elementary 04/27/2024 8 AM 6 Good Legacy Academy 04/27/2024 8 AM 13 Good Legacy Road 04/27/2024 8 AM 9 Good Moffett and Tustin Ranch 04/27/2024 8 AM 25 Good OC Animal Shelter 04/27/2024 8 AM 13 Good Valencia and Armstrong 04/27/2024 8 AM 7 Good Valencia and Columbus Square 04/27/2024 8 AM 7 Good Valencia and Legacy 04/27/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 04/27/2024 8 AM 14 Good Warner and Armstrong 04/27/2024 8 AM 7 Good Warner Avenue 04/27/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, April, 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/28/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 04/28/2024 8 AM 9 Good Hangar Fenceline - E Side 04/28/2024 8 AM 10 Good Hangar Fenceline - N Center 04/28/2024 8 AM 11 Good Hangar Fenceline - N Corner 04/28/2024 8 AM 10 Good Hangar Fenceline - NE Corner 04/28/2024 8 AM 10 Good Hangar Fenceline - NE Side 04/28/2024 8 AM 11 Good Hangar Fenceline - S Corner 04/28/2024 8 AM 10 Good Hangar Fenceline - S Side 04/28/2024 8 AM 13 Good Hangar Fenceline - SW Corner 04/28/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/28/2024 8 AM Particulate Matter • 11 Level of Concern Good Hangar Fenceline - W Side 04/28/2024 8 AM 11 Good Heritage Elementary 04/28/2024 8 AM 7 Good Legacy Academy 04/28/2024 8 AM 13 Good Legacy Road 04/28/2024 8 AM 10 Good Moffett and Tustin Ranch 04/28/2024 8 AM 16 Good OC Animal Shelter 04/28/2024 8 AM 18 Good Valencia and Armstrong 04/28/2024 8 AM 8 Good Valencia and Columbus Square 04/28/2024 8 AM 8 Good Valencia and Legacy 04/28/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 04/28/2024 8 AM 13 Good Warner and Armstrong 04/28/2024 8 AM 12 Good Warner Avenue 04/28/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, April, 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very UnhealthyHazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/29/2024 8 AM 7 Good Fire Station 37 04/29/2024 8 AM 10 Good Hangar Fenceline - E Side 04/29/2024 8 AM 12 Good Hangar Fenceline - N Center 04/29/2024 8 AM 11 Good Hangar Fenceline - N Corner 04/29/2024 8 AM 11 Good Hangar Fenceline - NE Corner 04/29/2024 8 AM 11 Good Hangar Fenceline - NE Side 04/29/2024 8 AM 12 Good Hangar Fenceline - S Corner 04/29/2024 8 AM 11 Good Hangar Fenceline - S Side 04/29/2024 8 AM 14 Good Hangar Fenceline - SW Corner 04/29/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/29/2024 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - W Side 04/29/2024 8 AM 11 Good Heritage Elementary 04/29/2024 8 AM 8 Good Legacy Academy 04/29/2024 8 AM 14 Good Legacy Road 04/29/2024 8 AM 11 Good Moffett and Tustin Ranch 04/29/2024 8 AM 16 Good OC Animal Shelter 04/29/2024 8 AM 14 Good Valencia and Armstrong 04/29/2024 8 AM 8 Good Valencia and Columbus Square 04/29/2024 8 AM 9 Good Valencia and Legacy 04/29/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 04/29/2024 8 AM 14 Good Warner and Armstrong 04/29/2024 8 AM 12 Good Warner Avenue 04/29/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health ed veryone. Maroon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Tuesday, April, 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/30/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 04/30/2024 8 AM 12 Good Hangar Fenceline - E Side 04/30/2024 8 AM 14 Good Hangar Fenceline - N Center 04/30/2024 8 AM 13 Good Hangar Fenceline - N Corner 04/30/2024 8 AM 13 Good Hangar Fenceline - NE Corner 04/30/2024 8 AM 14 Good Hangar Fenceline - NE Side 04/30/2024 8 AM 14 Good Hangar Fenceline - S Corner 04/30/2024 8 AM 13 Good Hangar Fenceline - S Side 04/30/2024 8 AM 16 Good Hangar Fenceline - SW Corner 04/30/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 04/30/2024 8 AM Particulate Matter 14 Level of Concern Good Hangar Fenceline - W Side 04/30/2024 8 AM 13 Good Heritage Elementary 04/30/2024 8 AM 9 Good Legacy Academy 04/30/2024 8 AM 17 Good Legacy Road 04/30/2024 8 AM 15 Good Moffett and Tustin Ranch 04/30/2024 8 AM 21 Good OC Animal Shelter 04/30/2024 8 AM 16 Good Valencia and Armstrong 04/30/2024 8 AM 10 Good Valencia and Columbus Square 04/30/2024 8 AM 11 Good Valencia and Legacy 04/30/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 04/30/2024 8 AM 18 Good Warner and Armstrong 04/30/2024 8 AM 14 Good Warner Avenue 04/30/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, May, 01, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/01/2024 8 AM Matter 11 Level of Concern Good Fire Station 37 05/01/2024 8 AM 12 Good Hangar Fenceline - E Side 05/01/2024 8 AM 14 Good Hangar Fenceline - N Center 05/01/2024 8 AM 12 Good Hangar Fenceline - N Corner 05/01/2024 8 AM 15 Good Hangar Fenceline - NE Corner 05/01/2024 8 AM 16 Good Hangar Fenceline - NE Side 05/01/2024 8 AM 19 Good Hangar Fenceline - S Corner 05/01/2024 8 AM 15 Good Hangar Fenceline - S Side 05/01/2024 8 AM 19 Good Hangar Fenceline - SW Corner 05/01/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/01/2024 8 AM Particulate Matter 17 Level of Concern Good Hangar Fenceline - W Side 05/01/2024 8 AM 17 Good Heritage Elementary 05/01/2024 8 AM 11 Good Legacy Academy 05/01/2024 8 AM 19 Good Legacy Road 05/01/2024 8 AM 16 Good Moffett and Tustin Ranch 05/01/2024 8 AM 23 Good OC Animal Shelter 05/01/2024 8 AM 18 Good Valencia and Armstrong 05/01/2024 8 AM 12 Good Valencia and Columbus Square 05/01/2024 8 AM 13 Good Valencia and Legacy 05/01/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 05/01/2024 8 AM 21 Good Warner and Armstrong 05/01/2024 8 AM 15 Good Warner Avenue 05/01/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, May, 02, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/02/2024 8 AM Matter 12 Level of Concern Good Fire Station 37 05/02/2024 8 AM 13 Good Hangar Fenceline - E Side 05/02/2024 8 AM 21 Good Hangar Fenceline - N Center 05/02/2024 8 AM 15 Good Hangar Fenceline - N Corner 05/02/2024 8 AM 17 Good Hangar Fenceline - NE Corner 05/02/2024 8 AM 19 Good Hangar Fenceline - NE Side 05/02/2024 8 AM 29 Good Hangar Fenceline - S Corner 05/02/2024 8 AM 17 Good Hangar Fenceline - S Side 05/02/2024 8 AM 20 Good Hangar Fenceline - SW Corner 05/02/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/02/2024 8 AM Particulate Matter 19 Level of Concern Good Hangar Fenceline - W Side 05/02/2024 8 AM 20 Good Heritage Elementary 05/02/2024 8 AM 13 Good Legacy Academy 05/02/2024 8 AM 23 Good Legacy Road 05/02/2024 8 AM 17 Good Moffett and Tustin Ranch 05/02/2024 8 AM 30 Good OC Animal Shelter 05/02/2024 8 AM 21 Good Valencia and Armstrong 05/02/2024 8 AM 14 Good Valencia and Columbus Square 05/02/2024 8 AM 16 Good Valencia and Legacy 05/02/2024 8 AM 23 Good Victory and Tustin Ranch Rd. 05/02/2024 8 AM 25 Good Warner and Armstrong 05/02/2024 8 AM 18 Good Warner Avenue 05/02/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, May, 03, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/03/2024 8 AM Matter 13 Level of Concern Good Fire Station 37 05/03/2024 8 AM 14 Good Hangar Fenceline - E Side 05/03/2024 8 AM 19 Good Hangar Fenceline - N Center 05/03/2024 8 AM 13 Good Hangar Fenceline - N Corner 05/03/2024 8 AM 17 Good Hangar Fenceline - NE Corner 05/03/2024 8 AM 18 Good Hangar Fenceline - NE Side 05/03/2024 8 AM 20 Good Hangar Fenceline - S Corner 05/03/2024 8 AM 18 Good Hangar Fenceline - S Side 05/03/2024 8 AM 21 Good Hangar Fenceline - SW Corner 05/03/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/03/2024 8 AM Particulate Matter • 20 Level of Concern Good Hangar Fenceline - W Side 05/03/2024 8 AM 19 Good Heritage Elementary 05/03/2024 8 AM 13 Good Legacy Academy 05/03/2024 8 AM 21 Good Legacy Road 05/03/2024 8 AM 19 Good Moffett and Tustin Ranch 05/03/2024 8 AM 29 Good OC Animal Shelter 05/03/2024 8 AM 21 Good Valencia and Armstrong 05/03/2024 8 AM 15 Good Valencia and Columbus Square 05/03/2024 8 AM 15 Good Valencia and Legacy 05/03/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 05/03/2024 8 AM 22 Good Warner and Armstrong 05/03/2024 8 AM 18 Good Warner Avenue 05/03/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, May, 04, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/04/2024 8 AM Matter 11 Level of Concern Good Fire Station 37 05/04/2024 8 AM 13 Good Hangar Fenceline - E Side 05/04/2024 8 AM 15 Good Hangar Fenceline - N Center 05/04/2024 8 AM 16 Good Hangar Fenceline - N Corner 05/04/2024 8 AM 15 Good Hangar Fenceline - NE Corner 05/04/2024 8 AM 16 Good Hangar Fenceline - NE Side 05/04/2024 8 AM 18 Good Hangar Fenceline - S Corner 05/04/2024 8 AM 15 Good Hangar Fenceline - S Side 05/04/2024 8 AM 19 Good Hangar Fenceline - SW Corner 05/04/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/04/2024 8 AM Particulate Matter 17 Level of Concern Good Hangar Fenceline - W Side 05/04/2024 8 AM 17 Good Heritage Elementary 05/04/2024 8 AM 12 Good Legacy Academy 05/04/2024 8 AM 19 Good Legacy Road 05/04/2024 8 AM 16 Good Moffett and Tustin Ranch 05/04/2024 8 AM 29 Good OC Animal Shelter 05/04/2024 8 AM 20 Good Valencia and Armstrong 05/04/2024 8 AM 13 Good Valencia and Columbus Square 05/04/2024 8 AM 13 Good Valencia and Legacy 05/04/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 05/04/2024 8 AM 20 Good Warner and Armstrong 05/04/2024 8 AM 16 Good Warner Avenue 05/04/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, May, 05, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/05/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 05/05/2024 8 AM 8 Good Hangar Fenceline - E Side 05/05/2024 8 AM 8 Good Hangar Fenceline - N Center 05/05/2024 8 AM ** ** Hangar Fenceline - N Corner 05/05/2024 8 AM 8 Good Hangar Fenceline - NE Corner 05/05/2024 8 AM 8 Good Hangar Fenceline - NE Side 05/05/2024 8 AM 9 Good Hangar Fenceline - S Corner 05/05/2024 8 AM 8 Good Hangar Fenceline - S Side 05/05/2024 8 AM 10 Good Hangar Fenceline - SW Corner 05/05/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/05/2024 8 AM Particulate Matter • 9 Level of Concern Good Hangar Fenceline - W Side 05/05/2024 8 AM 9 Good Heritage Elementary 05/05/2024 8 AM 7 Good Legacy Academy 05/05/2024 8 AM 10 Good Legacy Road 05/05/2024 8 AM 8 Good Moffett and Tustin Ranch 05/05/2024 8 AM 15 Good OC Animal Shelter 05/05/2024 8 AM 10 Good Valencia and Armstrong 05/05/2024 8 AM 7 Good Valencia and Columbus Square 05/05/2024 8 AM 7 Good Valencia and Legacy 05/05/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 05/05/2024 8 AM 11 Good Warner and Armstrong 05/05/2024 8 AM 9 Good Warner Avenue 05/05/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, May, 06, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/06/2024 8 AM Matter 5 Level of Concern Good Fire Station 37 05/06/2024 8 AM 7 Good Hangar Fenceline - E Side 05/06/2024 8 AM 7 Good Hangar Fenceline - N Center 05/06/2024 8 AM 6 Good Hangar Fenceline - N Corner 05/06/2024 8 AM 7 Good Hangar Fenceline - NE Corner 05/06/2024 8 AM 10 Good Hangar Fenceline - NE Side 05/06/2024 8 AM 9 Good Hangar Fenceline - S Corner 05/06/2024 8 AM 8 Good Hangar Fenceline - S Side 05/06/2024 8 AM 11 Good Hangar Fenceline - SW Corner 05/06/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/06/2024 8 AM Particulate Matter • 10 Level of Concern Good Hangar Fenceline - W Side 05/06/2024 8 AM 8 Good Heritage Elementary 05/06/2024 8 AM 6 Good Legacy Academy 05/06/2024 8 AM 11 Good Legacy Road 05/06/2024 8 AM 7 Good Moffett and Tustin Ranch 05/06/2024 8 AM 15 Good OC Animal Shelter 05/06/2024 8 AM 11 Good Valencia and Armstrong 05/06/2024 8 AM 6 Good Valencia and Columbus Square 05/06/2024 8 AM 6 Good Valencia and Legacy 05/06/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 05/06/2024 8 AM 12 Good Warner and Armstrong 05/06/2024 8 AM 9 Good Warner Avenue 05/06/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, May, 07, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/07/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 05/07/2024 8 AM 9 Good Hangar Fenceline - E Side 05/07/2024 8 AM 10 Good Hangar Fenceline - N Center 05/07/2024 8 AM 6 Good Hangar Fenceline - N Corner 05/07/2024 8 AM 10 Good Hangar Fenceline - NE Corner 05/07/2024 8 AM 9 Good Hangar Fenceline - NE Side 05/07/2024 8 AM 9 Good Hangar Fenceline - S Corner 05/07/2024 8 AM 9 Good Hangar Fenceline - S Side 05/07/2024 8 AM 13 Good Hangar Fenceline - SW Corner 05/07/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/07/2024 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - W Side 05/07/2024 8 AM 9 Good Heritage Elementary 05/07/2024 8 AM 6 Good Legacy Academy 05/07/2024 8 AM 13 Good Legacy Road 05/07/2024 8 AM 8 Good Moffett and Tustin Ranch 05/07/2024 8 AM 18 Good OC Animal Shelter 05/07/2024 8 AM 11 Good Valencia and Armstrong 05/07/2024 8 AM 7 Good Valencia and Columbus Square 05/07/2024 8 AM 6 Good Valencia and Legacy 05/07/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 05/07/2024 8 AM 12 Good Warner and Armstrong 05/07/2024 8 AM 10 Good Warner Avenue 05/07/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, May, 08, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/08/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 05/08/2024 8 AM 9 Good Hangar Fenceline - E Side 05/08/2024 8 AM 11 Good Hangar Fenceline - N Center 05/08/2024 8 AM 6 Good Hangar Fenceline - N Corner 05/08/2024 8 AM 10 Good Hangar Fenceline - NE Corner 05/08/2024 8 AM 11 Good Hangar Fenceline - NE Side 05/08/2024 8 AM 11 Good Hangar Fenceline - S Corner 05/08/2024 8 AM 11 Good Hangar Fenceline - S Side 05/08/2024 8 AM 14 Good Hangar Fenceline - SW Corner 05/08/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/08/2024 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - W Side 05/08/2024 8 AM 13 Good Heritage Elementary 05/08/2024 8 AM 7 Good Legacy Academy 05/08/2024 8 AM 15 Good Legacy Road 05/08/2024 8 AM 11 Good Moffett and Tustin Ranch 05/08/2024 8 AM 18 Good OC Animal Shelter 05/08/2024 8 AM 15 Good Valencia and Armstrong 05/08/2024 8 AM 8 Good Valencia and Columbus Square 05/08/2024 8 AM 9 Good Valencia and Legacy 05/08/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 05/08/2024 8 AM 15 Good Warner and Armstrong 05/08/2024 8 AM 11 Good Warner Avenue 05/08/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, May, 09, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/09/2024 8 AM Matter 10 Level of Concern Good Fire Station 37 05/09/2024 8 AM 12 Good Hangar Fenceline - E Side 05/09/2024 8 AM 15 Good Hangar Fenceline - N Center 05/09/2024 8 AM 10 Good Hangar Fenceline - N Corner 05/09/2024 8 AM 15 Good Hangar Fenceline - NE Corner 05/09/2024 8 AM 17 Good Hangar Fenceline - NE Side 05/09/2024 8 AM 18 Good Hangar Fenceline - S Corner 05/09/2024 8 AM 15 Good Hangar Fenceline - S Side 05/09/2024 8 AM 19 Good Hangar Fenceline - SW Corner 05/09/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/09/2024 8 AM Particulate Matter • 18 Level of Concern Good Hangar Fenceline - W Side 05/09/2024 8 AM 18 Good Heritage Elementary 05/09/2024 8 AM 11 Good Legacy Academy 05/09/2024 8 AM 20 Good Legacy Road 05/09/2024 8 AM 15 Good Moffett and Tustin Ranch 05/09/2024 8 AM 25 Good OC Animal Shelter 05/09/2024 8 AM 20 Good Valencia and Armstrong 05/09/2024 8 AM 13 Good Valencia and Columbus Square 05/09/2024 8 AM 13 Good Valencia and Legacy 05/09/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 05/09/2024 8 AM 21 Good Warner and Armstrong 05/09/2024 8 AM 17 Good Warner Avenue 05/09/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, May, 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/10/2024 8 AM Matter 12 Level of Concern Good Fire Station 37 05/10/2024 8 AM 13 Good Hangar Fenceline - E Side 05/10/2024 8 AM 17 Good Hangar Fenceline - N Center 05/10/2024 8 AM 12 Good Hangar Fenceline - N Corner 05/10/2024 8 AM 16 Good Hangar Fenceline - NE Corner 05/10/2024 8 AM 18 Good Hangar Fenceline - NE Side 05/10/2024 8 AM 19 Good Hangar Fenceline - S Corner 05/10/2024 8 AM 18 Good Hangar Fenceline - S Side 05/10/2024 8 AM 20 Good Hangar Fenceline - SW Corner 05/10/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/10/2024 8 AM Particulate Matter 19 Level of Concern Good Hangar Fenceline - W Side 05/10/2024 8 AM 19 Good Heritage Elementary 05/10/2024 8 AM 13 Good Legacy Academy 05/10/2024 8 AM 22 Good Legacy Road 05/10/2024 8 AM 17 Good Moffett and Tustin Ranch 05/10/2024 8 AM 25 Good OC Animal Shelter 05/10/2024 8 AM 20 Good Valencia and Armstrong 05/10/2024 8 AM 16 Good Valencia and Columbus Square 05/10/2024 8 AM 14 Good Valencia and Legacy 05/10/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 05/10/2024 8 AM 24 Good Warner and Armstrong 05/10/2024 8 AM 20 Good Warner Avenue 05/10/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, May, 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/11/2024 8 AM Matter 19 Level of Concern Good Fire Station 37 05/11/2024 8 AM 20 Good Hangar Fenceline - E Side 05/11/2024 8 AM 25 Good Hangar Fenceline - N Center 05/11/2024 8 AM 20 Good Hangar Fenceline - N Corner 05/11/2024 8 AM 25 Good Hangar Fenceline - NE Corner 05/11/2024 8 AM 26 Good Hangar Fenceline - NE Side 05/11/2024 8 AM 28 Good Hangar Fenceline - S Corner 05/11/2024 8 AM 25 Good Hangar Fenceline - S Side 05/11/2024 8 AM 29 Good Hangar Fenceline - SW Corner 05/11/2024 8 AM 26 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/11/2024 8 AM Particulate Matter • 27 Level of Concern Good Hangar Fenceline - W Side 05/11/2024 8 AM 30 Good Heritage Elementary 05/11/2024 8 AM 22 Good Legacy Academy 05/11/2024 8 AM 32 Good Legacy Road 05/11/2024 8 AM 27 Good Moffett and Tustin Ranch 05/11/2024 8 AM 37 Good OC Animal Shelter 05/11/2024 8 AM 29 Good Valencia and Armstrong 05/11/2024 8 AM 25 Good Valencia and Columbus Square 05/11/2024 8 AM 23 Good Valencia and Legacy 05/11/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 05/11/2024 8 AM 33 Good Warner and Armstrong 05/11/2024 8 AM 27 Good Warner Avenue 05/11/2024 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, May, 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/12/2024 8 AM Matter 16 Level of Concern Good Fire Station 37 05/12/2024 8 AM 17 Good Hangar Fenceline - E Side 05/12/2024 8 AM 21 Good Hangar Fenceline - N Center 05/12/2024 8 AM 18 Good Hangar Fenceline - N Corner 05/12/2024 8 AM 21 Good Hangar Fenceline - NE Corner 05/12/2024 8 AM 20 Good Hangar Fenceline - NE Side 05/12/2024 8 AM 22 Good Hangar Fenceline - S Corner 05/12/2024 8 AM 20 Good Hangar Fenceline - S Side 05/12/2024 8 AM 24 Good Hangar Fenceline - SW Corner 05/12/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/12/2024 8 AM Particulate Matter 22 Level of Concern Good Hangar Fenceline - W Side 05/12/2024 8 AM 23 Good Heritage Elementary 05/12/2024 8 AM 17 Good Legacy Academy 05/12/2024 8 AM 25 Good Legacy Road 05/12/2024 8 AM 23 Good Moffett and Tustin Ranch 05/12/2024 8 AM 17 Good OC Animal Shelter 05/12/2024 8 AM 23 Good Valencia and Armstrong 05/12/2024 8 AM 20 Good Valencia and Columbus Square 05/12/2024 8 AM 21 Good Valencia and Legacy 05/12/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 05/12/2024 8 AM 25 Good Warner and Armstrong 05/12/2024 8 AM 20 Good Warner Avenue 05/12/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, May, 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/13/2024 8 AM Matter 13 Level of Concern Good Fire Station 37 05/13/2024 8 AM 15 Good Hangar Fenceline - E Side 05/13/2024 8 AM 16 Good Hangar Fenceline - N Center 05/13/2024 8 AM 15 Good Hangar Fenceline - N Corner 05/13/2024 8 AM 16 Good Hangar Fenceline - NE Corner 05/13/2024 8 AM 16 Good Hangar Fenceline - NE Side 05/13/2024 8 AM 18 Good Hangar Fenceline - S Corner 05/13/2024 8 AM 17 Good Hangar Fenceline - S Side 05/13/2024 8 AM 21 Good Hangar Fenceline - SW Corner 05/13/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/13/2024 8 AM Particulate Matter • 18 Level of Concern Good Hangar Fenceline - W Side 05/13/2024 8 AM 18 Good Heritage Elementary 05/13/2024 8 AM 14 Good Legacy Academy 05/13/2024 8 AM 20 Good Legacy Road 05/13/2024 8 AM 18 Good Moffett and Tustin Ranch 05/13/2024 8 AM 19 Good OC Animal Shelter 05/13/2024 8 AM 19 Good Valencia and Armstrong 05/13/2024 8 AM 16 Good Valencia and Columbus Square 05/13/2024 8 AM 15 Good Valencia and Legacy 05/13/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 05/13/2024 8 AM 20 Good Warner and Armstrong 05/13/2024 8 AM 18 Good Warner Avenue 05/13/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, May, 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/14/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 05/14/2024 8 AM 11 Good Hangar Fenceline - E Side 05/14/2024 8 AM 11 Good Hangar Fenceline - N Center 05/14/2024 8 AM 10 Good Hangar Fenceline - N Corner 05/14/2024 8 AM 12 Good Hangar Fenceline - NE Corner 05/14/2024 8 AM 12 Good Hangar Fenceline - NE Side 05/14/2024 8 AM 13 Good Hangar Fenceline - S Corner 05/14/2024 8 AM 12 Good Hangar Fenceline - S Side 05/14/2024 8 AM 15 Good Hangar Fenceline - SW Corner 05/14/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/14/2024 8 AM Particulate Matter 14 Level of Concern Good Hangar Fenceline - W Side 05/14/2024 8 AM 13 Good Heritage Elementary 05/14/2024 8 AM 10 Good Legacy Academy 05/14/2024 8 AM 14 Good Legacy Road 05/14/2024 8 AM 12 Good Moffett and Tustin Ranch 05/14/2024 8 AM 15 Good OC Animal Shelter 05/14/2024 8 AM 14 Good Valencia and Armstrong 05/14/2024 8 AM 11 Good Valencia and Columbus Square 05/14/2024 8 AM 11 Good Valencia and Legacy 05/14/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 05/14/2024 8 AM 14 Good Warner and Armstrong 05/14/2024 8 AM 14 Good Warner Avenue 05/14/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, May, 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/15/2024 8 AM Matter 9 Level of Concern Good Fire Station 37 05/15/2024 8 AM 10 Good Hangar Fenceline - E Side 05/15/2024 8 AM 11 Good Hangar Fenceline - N Center 05/15/2024 8 AM 9 Good Hangar Fenceline - N Corner 05/15/2024 8 AM 11 Good Hangar Fenceline - NE Corner 05/15/2024 8 AM 12 Good Hangar Fenceline - NE Side 05/15/2024 8 AM 12 Good Hangar Fenceline - S Corner 05/15/2024 8 AM 11 Good Hangar Fenceline - S Side 05/15/2024 8 AM 14 Good Hangar Fenceline - SW Corner 05/15/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/15/2024 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - W Side 05/15/2024 8 AM 13 Good Heritage Elementary 05/15/2024 8 AM 9 Good Legacy Academy 05/15/2024 8 AM 13 Good Legacy Road 05/15/2024 8 AM 11 Good Moffett and Tustin Ranch 05/15/2024 8 AM 13 Good OC Animal Shelter 05/15/2024 8 AM 13 Good Valencia and Armstrong 05/15/2024 8 AM 11 Good Valencia and Columbus Square 05/15/2024 8 AM 10 Good Valencia and Legacy 05/15/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 05/15/2024 8 AM 13 Good Warner and Armstrong 05/15/2024 8 AM 12 Good Warner Avenue 05/15/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, May, 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/16/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 05/16/2024 8 AM 9 Good Hangar Fenceline - E Side 05/16/2024 8 AM 10 Good Hangar Fenceline - N Center 05/16/2024 8 AM 8 Good Hangar Fenceline - N Corner 05/16/2024 8 AM 10 Good Hangar Fenceline - NE Corner 05/16/2024 8 AM 9 Good Hangar Fenceline - NE Side 05/16/2024 8 AM 10 Good Hangar Fenceline - S Corner 05/16/2024 8 AM 10 Good Hangar Fenceline - S Side 05/16/2024 8 AM 12 Good Hangar Fenceline - SW Corner 05/16/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/16/2024 8 AM Particulate Matter 10 Level of Concern Good Hangar Fenceline - W Side 05/16/2024 8 AM 10 Good Heritage Elementary 05/16/2024 8 AM 9 Good Legacy Academy 05/16/2024 8 AM 13 Good Legacy Road 05/16/2024 8 AM 10 Good Moffett and Tustin Ranch 05/16/2024 8 AM 11 Good OC Animal Shelter 05/16/2024 8 AM 12 Good Valencia and Armstrong 05/16/2024 8 AM 10 Good Valencia and Columbus Square 05/16/2024 8 AM 9 Good Valencia and Legacy 05/16/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 05/16/2024 8 AM 12 Good Warner and Armstrong 05/16/2024 8 AM 11 Good Warner Avenue 05/16/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Friday, May, 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/17/2024 8 AM Matter 7 Level of Concern Good Fire Station 37 05/17/2024 8 AM 8 Good Hangar Fenceline - E Side 05/17/2024 8 AM 9 Good Hangar Fenceline - N Center 05/17/2024 8 AM 7 Good Hangar Fenceline - N Corner 05/17/2024 8 AM 9 Good Hangar Fenceline - NE Corner 05/17/2024 8 AM 9 Good Hangar Fenceline - NE Side 05/17/2024 8 AM 9 Good Hangar Fenceline - S Corner 05/17/2024 8 AM 9 Good Hangar Fenceline - S Side 05/17/2024 8 AM 11 Good Hangar Fenceline - SW Corner 05/17/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/17/2024 8 AM Particulate Matter 10 Level of Concern Good Hangar Fenceline - W Side 05/17/2024 8 AM 11 Good Heritage Elementary 05/17/2024 8 AM 8 Good Legacy Academy 05/17/2024 8 AM 11 Good Legacy Road 05/17/2024 8 AM 9 Good Moffett and Tustin Ranch 05/17/2024 8 AM 10 Good OC Animal Shelter 05/17/2024 8 AM 11 Good Valencia and Armstrong 05/17/2024 8 AM 9 Good Valencia and Columbus Square 05/17/2024 8 AM 7 Good Valencia and Legacy 05/17/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 05/17/2024 8 AM 11 Good Warner and Armstrong 05/17/2024 8 AM 10 Good Warner Avenue 05/17/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Saturday, May, 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/18/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 05/18/2024 8 AM 9 Good Hangar Fenceline - E Side 05/18/2024 8 AM 10 Good Hangar Fenceline - N Center 05/18/2024 8 AM 7 Good Hangar Fenceline - N Corner 05/18/2024 8 AM 10 Good Hangar Fenceline - NE Corner 05/18/2024 8 AM 10 Good Hangar Fenceline - NE Side 05/18/2024 8 AM 11 Good Hangar Fenceline - S Corner 05/18/2024 8 AM 10 Good Hangar Fenceline - S Side 05/18/2024 8 AM 13 Good Hangar Fenceline - SW Corner 05/18/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/18/2024 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - W Side 05/18/2024 8 AM 12 Good Heritage Elementary 05/18/2024 8 AM 9 Good Legacy Academy 05/18/2024 8 AM 12 Good Legacy Road 05/18/2024 8 AM 10 Good Moffett and Tustin Ranch 05/18/2024 8 AM 12 Good OC Animal Shelter 05/18/2024 8 AM 12 Good Valencia and Armstrong 05/18/2024 8 AM 10 Good Valencia and Columbus Square 05/18/2024 8 AM 8 Good Valencia and Legacy 05/18/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 05/18/2024 8 AM 13 Good Warner and Armstrong 05/18/2024 8 AM 12 Good Warner Avenue 05/18/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Sunday, May, 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/19/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 05/19/2024 8 AM 9 Good Hangar Fenceline - E Side 05/19/2024 8 AM 10 Good Hangar Fenceline - N Center 05/19/2024 8 AM 9 Good Hangar Fenceline - N Corner 05/19/2024 8 AM 10 Good Hangar Fenceline - NE Corner 05/19/2024 8 AM 10 Good Hangar Fenceline - NE Side 05/19/2024 8 AM 11 Good Hangar Fenceline - S Corner 05/19/2024 8 AM 10 Good Hangar Fenceline - S Side 05/19/2024 8 AM 12 Good Hangar Fenceline - SW Corner 05/19/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/19/2024 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - W Side 05/19/2024 8 AM 12 Good Heritage Elementary 05/19/2024 8 AM 8 Good Legacy Academy 05/19/2024 8 AM 11 Good Legacy Road 05/19/2024 8 AM 10 Good Moffett and Tustin Ranch 05/19/2024 8 AM 11 Good OC Animal Shelter 05/19/2024 8 AM 11 Good Valencia and Armstrong 05/19/2024 8 AM 9 Good Valencia and Columbus Square 05/19/2024 8 AM 8 Good Valencia and Legacy 05/19/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 05/19/2024 8 AM 12 Good Warner and Armstrong 05/19/2024 8 AM 13 Good Warner Avenue 05/19/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Monday, May, 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/20/2024 8 AM Matter 6 Level of Concern Good Fire Station 37 05/20/2024 8 AM 8 Good Hangar Fenceline - E Side 05/20/2024 8 AM 8 Good Hangar Fenceline - N Center 05/20/2024 8 AM 7 Good Hangar Fenceline - N Corner 05/20/2024 8 AM 8 Good Hangar Fenceline - NE Corner 05/20/2024 8 AM 8 Good Hangar Fenceline - NE Side 05/20/2024 8 AM 8 Good Hangar Fenceline - S Corner 05/20/2024 8 AM 8 Good Hangar Fenceline - S Side 05/20/2024 8 AM 10 Good Hangar Fenceline - SW Corner 05/20/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/20/2024 8 AM Particulate Matter 9 Level of Concern Good Hangar Fenceline - W Side 05/20/2024 8 AM 14 Good Heritage Elementary 05/20/2024 8 AM 6 Good Legacy Academy 05/20/2024 8 AM 9 Good Legacy Road 05/20/2024 8 AM 8 Good Moffett and Tustin Ranch 05/20/2024 8 AM 8 Good OC Animal Shelter 05/20/2024 8 AM 9 Good Valencia and Armstrong 05/20/2024 8 AM 7 Good Valencia and Columbus Square 05/20/2024 8 AM 6 Good Valencia and Legacy 05/20/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 05/20/2024 8 AM 14 Good Warner and Armstrong 05/20/2024 8 AM 9 Good Warner Avenue 05/20/2024 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Tuesday, May, 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/21/2024 8 AM Matter 8 Level of Concern Good Fire Station 37 05/21/2024 8 AM 9 Good Hangar Fenceline - E Side 05/21/2024 8 AM 11 Good Hangar Fenceline - N Center 05/21/2024 8 AM 8 Good Hangar Fenceline - N Corner 05/21/2024 8 AM 12 Good Hangar Fenceline - NE Corner 05/21/2024 8 AM 11 Good Hangar Fenceline - NE Side 05/21/2024 8 AM 12 Good Hangar Fenceline - S Corner 05/21/2024 8 AM 11 Good Hangar Fenceline - S Side 05/21/2024 8 AM 15 Good Hangar Fenceline - SW Corner 05/21/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/21/2024 8 AM Particulate Matter 13 Level of Concern Good Hangar Fenceline - W Side 05/21/2024 8 AM 14 Good Heritage Elementary 05/21/2024 8 AM 8 Good Legacy Academy 05/21/2024 8 AM 14 Good Legacy Road 05/21/2024 8 AM 11 Good Moffett and Tustin Ranch 05/21/2024 8 AM 16 Good OC Animal Shelter 05/21/2024 8 AM 14 Good Valencia and Armstrong 05/21/2024 8 AM 11 Good Valencia and Columbus Square 05/21/2024 8 AM 8 Good Valencia and Legacy 05/21/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 05/21/2024 8 AM 16 Good Warner and Armstrong 05/21/2024 8 AM 12 Good Warner Avenue 05/21/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Wednesday, May, 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/22/2024 8 AM Matter 12 Level of Concern Good Fire Station 37 05/22/2024 8 AM 13 Good Hangar Fenceline - E Side 05/22/2024 8 AM 17 Good Hangar Fenceline - N Center 05/22/2024 8 AM 9 Good Hangar Fenceline - N Corner 05/22/2024 8 AM 16 Good Hangar Fenceline - NE Corner 05/22/2024 8 AM 17 Good Hangar Fenceline - NE Side 05/22/2024 8 AM 17 Good Hangar Fenceline - S Corner 05/22/2024 8 AM 16 Good Hangar Fenceline - S Side 05/22/2024 8 AM 20 Good Hangar Fenceline - SW Corner 05/22/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - SW Side Period • • 05/22/2024 8 AM Particulate Matter • 18 Level of Concern Good Hangar Fenceline - W Side 05/22/2024 8 AM 19 Good Heritage Elementary 05/22/2024 8 AM 13 Good Legacy Academy 05/22/2024 8 AM 20 Good Legacy Road 05/22/2024 8 AM 16 Good Moffett and Tustin Ranch 05/22/2024 8 AM 21 Good OC Animal Shelter 05/22/2024 8 AM 19 Good Valencia and Armstrong 05/22/2024 8 AM 16 Good Valencia and Columbus Square 05/22/2024 8 AM 12 Good Valencia and Legacy 05/22/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 05/22/2024 8 AM 22 Good Warner and Armstrong 05/22/2024 8 AM 17 Good Warner Avenue 05/22/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy to 424 Health alert: The risk of health veryone. Hazardous • 504 Health warning of - •- conditions: •ne is more likely JL— to be affected. Thursday, May, 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very UnhealthyHazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/23/2024 8 AM • 13 Good Hangar Fenceline - E Side 05/23/2024 8 AM 16 Good Hangar Fenceline - N Center 05/23/2024 8 AM 10 Good Hangar Fenceline - N Corner 05/23/2024 8 AM 16 Good Hangar Fenceline - NE Corner 05/23/2024 8 AM 16 Good Hangar Fenceline - NE Side 05/23/2024 8 AM 16 Good Hangar Fenceline - S Corner 05/23/2024 8 AM 16 Good Hangar Fenceline - S Side 05/23/2024 8 AM 19 Good Hangar Fenceline - SW Corner 05/23/2024 8 AM 17 Good Hangar Fenceline - SW Side 05/23/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 05/23/2024 8 AM Particulate Matter • 21 Level of Concern Good Legacy Road 05/23/2024 8 AM 16 Good Moffett and Tustin Ranch 05/23/2024 8 AM 19 Good Valencia and Armstrong 05/23/2024 8 AM 15 Good Valencia and Columbus Square 05/23/2024 8 AM 12 Good Valencia and Legacy 05/23/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 05/23/2024 8 AM 21 Good Warner and Armstrong 05/23/2024 8 AM 15 Good Warner Avenue 05/23/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Friday, May, 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/24/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 05/24/2024 8 AM 11 Good Hangar Fenceline - N Center 05/24/2024 8 AM 7 Good Hangar Fenceline - N Corner 05/24/2024 8 AM 11 Good Hangar Fenceline - NE Corner 05/24/2024 8 AM 11 Good Hangar Fenceline - NE Side 05/24/2024 8 AM 12 Good Hangar Fenceline - S Corner 05/24/2024 8 AM 12 Good Hangar Fenceline - S Side 05/24/2024 8 AM 15 Good Hangar Fenceline - SW Corner 05/24/2024 8 AM 12 Good Hangar Fenceline - SW Side 05/24/2024 8 AM 13 Good Location Hangar Fenceline - W Side 24-Hour Period Ending 05/24/2024 8 AM Particulate Matter 12 Level of Concern Good Legacy Road 05/24/2024 8 AM 11 Good Moffett and Tustin Ranch 05/24/2024 8 AM 14 Good Valencia and Armstrong 05/24/2024 8 AM 11 Good Valencia and Columbus Square 05/24/2024 8 AM 9 Good Valencia and Legacy 05/24/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 05/24/2024 8 AM 10 Good Warner and Armstrong 05/24/2024 8 AM 10 Good Warner Avenue -7 05/24/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, May, 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/25/2024 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 05/25/2024 8 AM 12 Good Hangar Fenceline - N Center 05/25/2024 8 AM 6 Good Hangar Fenceline - N Corner 05/25/2024 8 AM 12 Good Hangar Fenceline - NE Corner 05/25/2024 8 AM 11 Good Hangar Fenceline - NE Side 05/25/2024 8 AM 12 Good Hangar Fenceline - S Corner 05/25/2024 8 AM 12 Good Hangar Fenceline - S Side 05/25/2024 8 AM 15 Good Hangar Fenceline - SW Corner 05/25/2024 8 AM 12 Good Hangar Fenceline - SW Side 05/25/2024 8 AM 14 Good Location Hangar Fenceline - W Side 24-Hour Period Ending 05/25/2024 8 AM Particulate Matter 13 Level of Concern Good Legacy Road 05/25/2024 8 AM 12 Good Moffett and Tustin Ranch 05/25/2024 8 AM 14 Good Valencia and Armstrong 05/25/2024 8 AM 11 Good Valencia and Columbus Square 05/25/2024 8 AM 9 Good Valencia and Legacy 05/25/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 05/25/2024 8 AM 9 Good Warner and Armstrong 05/25/2024 8 AM 12 Good Warner Avenue -7 05/25/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, May, 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/26/2024 8 AM Matter 4 Level of Concern Good Hangar Fenceline - E Side 05/26/2024 8 AM 5 Good Hangar Fenceline - N Center 05/26/2024 8 AM 4 Good Hangar Fenceline - N Corner 05/26/2024 8 AM 6 Good Hangar Fenceline - NE Corner 05/26/2024 8 AM 6 Good Hangar Fenceline - NE Side 05/26/2024 8 AM 6 Good Hangar Fenceline - S Corner 05/26/2024 8 AM 6 Good Hangar Fenceline - S Side 05/26/2024 8 AM 8 Good Hangar Fenceline - SW Corner 05/26/2024 8 AM 6 Good Hangar Fenceline - SW Side 05/26/2024 8 AM 7 Good Location Hangar Fenceline - W Side 24-Hour Period Ending 05/26/2024 8 AM Particulate Matter 7 Level of Concern Good Legacy Road 05/26/2024 8 AM 5 Good Moffett and Tustin Ranch 05/26/2024 8 AM 8 Good Valencia and Armstrong 05/26/2024 8 AM 5 Good Valencia and Columbus Square 05/26/2024 8 AM 4 Good Valencia and Legacy 05/26/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 05/26/2024 8 AM 6 Good Warner and Armstrong 05/26/2024 8 AM 7 Good Warner Avenue 05/26/2024 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, May, 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/27/2024 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 05/27/2024 8 AM 11 Good Hangar Fenceline - N Center 05/27/2024 8 AM 7 Good Hangar Fenceline - N Corner 05/27/2024 8 AM 11 Good Hangar Fenceline - NE Corner 05/27/2024 8 AM 10 Good Hangar Fenceline - NE Side 05/27/2024 8 AM 11 Good Hangar Fenceline - S Corner 05/27/2024 8 AM 11 Good Hangar Fenceline - S Side 05/27/2024 8 AM 13 Good Hangar Fenceline - SW Corner 05/27/2024 8 AM 12 Good Hangar Fenceline - SW Side 05/27/2024 8 AM 12 Good Location Hangar Fenceline - W Side 24-Hour Period Ending 05/27/2024 8 AM Particulate Matter 12 Level of Concern Good Legacy Road 05/27/2024 8 AM 10 Good Moffett and Tustin Ranch 05/27/2024 8 AM 15 Good Valencia and Armstrong 05/27/2024 8 AM 11 Good Valencia and Columbus Square 05/27/2024 8 AM 8 Good Valencia and Legacy 05/27/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 05/27/2024 8 AM 9 Good Warner and Armstrong 05/27/2024 8 AM 10 Good Warner Avenue 05/27/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, May, 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/28/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 05/28/2024 8 AM 20 Good Hangar Fenceline - N Center 05/28/2024 8 AM 12 Good Hangar Fenceline - N Corner 05/28/2024 8 AM 19 Good Hangar Fenceline - NE Corner 05/28/2024 8 AM 18 Good Hangar Fenceline - NE Side 05/28/2024 8 AM 20 Good Hangar Fenceline - S Corner 05/28/2024 8 AM 18 Good Hangar Fenceline - S Side 05/28/2024 8 AM 21 Good Hangar Fenceline - SW Corner 05/28/2024 8 AM 19 Good Hangar Fenceline - SW Side 05/28/2024 8 AM 19 Good Location Hangar Fenceline - W Side 24-Hour Period Ending 05/28/2024 8 AM Particulate Matter 20 Level of Concern Good Legacy Road 05/28/2024 8 AM 18 Good Moffett and Tustin Ranch 05/28/2024 8 AM 22 Good Valencia and Armstrong 05/28/2024 8 AM 18 Good Valencia and Columbus Square 05/28/2024 8 AM 15 Good Valencia and Legacy 05/28/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 05/28/2024 8 AM 16 Good Warner and Armstrong 05/28/2024 8 AM 18 Good Warner Avenue -7 05/28/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, May, 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/30/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 05/30/2024 8 AM 16 Good Hangar Fenceline - N Center 05/30/2024 8 AM ** ** Hangar Fenceline - N Corner 05/30/2024 8 AM 12 Good Hangar Fenceline - NE Corner 05/30/2024 8 AM 11 Good Hangar Fenceline - NE Side 05/30/2024 8 AM 12 Good Hangar Fenceline - S Corner 05/30/2024 8 AM 13 Good Hangar Fenceline - S Side 05/30/2024 8 AM 17 Good Hangar Fenceline - SW Corner 05/29/2024 8 AM 19 Good Hangar Fenceline - SW Side 05/30/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 05/30/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 05/30/2024 8 AM 12 Good Moffett and Tustin Ranch 05/30/2024 8 AM 21 Good Valencia and Armstrong 05/30/2024 8 AM 13 Good Valencia and Columbus Square 05/30/2024 8 AM 10 Good Valencia and Legacy 05/30/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 05/30/2024 8 AM 12 Good Warner and Armstrong 05/30/2024 8 AM 23 Good Warner Avenue -7 05/30/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Thursday, May, 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/30/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 05/30/2024 8 AM 15 Good Hangar Fenceline - N Center 05/30/2024 8 AM 10 Good Hangar Fenceline - N Corner 05/30/2024 8 AM 15 Good Hangar Fenceline - NE Corner 05/30/2024 8 AM 14 Good Hangar Fenceline - NE Side 05/30/2024 8 AM 17 Good Hangar Fenceline - S Corner 05/30/2024 8 AM 16 Good Hangar Fenceline - S Side 05/30/2024 8 AM 21 Good Hangar Fenceline - SW Corner 05/30/2024 8 AM 16 Good Hangar Fenceline - SW Side 05/30/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 05/30/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 05/30/2024 8 AM 15 Good Moffett and Tustin Ranch 05/30/2024 8 AM 23 Good Valencia and Armstrong 05/30/2024 8 AM 15 Good Valencia and Columbus Square 05/30/2024 8 AM 13 Good Valencia and Legacy 05/30/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 05/30/2024 8 AM 14 Good Warner and Armstrong 05/30/2024 8 AM 26 Good Warner Avenue -7 05/30/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Friday, May, 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 05/31/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 05/31/2024 8 AM 20 Good Hangar Fenceline - N Center 05/31/2024 8 AM 13 Good Hangar Fenceline - N Corner 05/31/2024 8 AM 21 Good Hangar Fenceline - NE Corner 05/31/2024 8 AM 20 Good Hangar Fenceline - NE Side 05/31/2024 8 AM 23 Good Hangar Fenceline - S Corner 05/31/2024 8 AM 22 Good Hangar Fenceline - S Side 05/31/2024 8 AM 25 Good Hangar Fenceline - SW Corner 05/31/2024 8 AM 21 Good Hangar Fenceline - SW Side 05/31/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 05/31/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 05/31/2024 8 AM 21 Good Moffett and Tustin Ranch 05/31/2024 8 AM 27 Good Valencia and Armstrong 05/31/2024 8 AM 21 Good Valencia and Columbus Square 05/31/2024 8 AM 18 Good Valencia and Legacy 05/31/2024 8 AM 28 Good Victory and Tustin Ranch Rd. 05/31/2024 8 AM 18 Good Warner and Armstrong 05/31/2024 8 AM 30 Good Warner Avenue -7 05/31/2024 8 AM 24 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, June, 01, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/01/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 06/01/2024 8 AM 17 Good Hangar Fenceline - N Center 06/01/2024 8 AM 12 Good Hangar Fenceline - N Corner 06/01/2024 8 AM 18 Good Hangar Fenceline - NE Corner 06/01/2024 8 AM 17 Good Hangar Fenceline - NE Side 06/01/2024 8 AM 20 Good Hangar Fenceline - S Corner 06/01/2024 8 AM 18 Good Hangar Fenceline - S Side 06/01/2024 8 AM 22 Good Hangar Fenceline - SW Corner 06/01/2024 8 AM 18 Good Hangar Fenceline - SW Side 06/01/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/01/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 06/01/2024 8 AM 17 Good Moffett and Tustin Ranch 06/01/2024 8 AM 25 Good Valencia and Armstrong 06/01/2024 8 AM 17 Good Valencia and Columbus Square 06/01/2024 8 AM 14 Good Valencia and Legacy 06/01/2024 8 AM 23 Good Victory and Tustin Ranch Rd. 06/01/2024 8 AM 15 Good Warner and Armstrong 06/01/2024 8 AM 25 Good Warner Avenue -7 06/01/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Sunday, June, 02, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/02/2024 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 06/02/2024 8 AM 9 Good Hangar Fenceline - N Center 06/02/2024 8 AM 6 Good Hangar Fenceline - N Corner 06/02/2024 8 AM 10 Good Hangar Fenceline - NE Corner 06/02/2024 8 AM 9 Good Hangar Fenceline - NE Side 06/02/2024 8 AM 11 Good Hangar Fenceline - S Corner 06/02/2024 8 AM 10 Good Hangar Fenceline - S Side 06/02/2024 8 AM 13 Good Hangar Fenceline - SW Corner 06/02/2024 8 AM 10 Good Hangar Fenceline - SW Side 06/02/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/02/2024 8 AM Particulate Matter • 10 Level of Concern Good Legacy Road 06/02/2024 8 AM 9 Good Moffett and Tustin Ranch 06/02/2024 8 AM 15 Good Valencia and Armstrong 06/02/2024 8 AM 10 Good Valencia and Columbus Square 06/02/2024 8 AM 8 Good Valencia and Legacy 06/02/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 06/02/2024 8 AM 9 Good Warner and Armstrong 06/02/2024 8 AM 15 Good Warner Avenue -7 06/02/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Monday, June, 03, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy (355 to 424) Location Columbus Square Park 24-Hour Period Ending 06/03/2024 8 AM 9 Good Hangar Fenceline - E Side 06/03/2024 8 AM 10 Good Hangar Fenceline - N Center 06/03/2024 8 AM 6 Good Hangar Fenceline - N Corner 06/03/2024 8 AM 11 Good Hangar Fenceline - NE Corner 06/03/2024 8 AM 11 Good Hangar Fenceline - NE Side 06/03/2024 8 AM 12 Good Hangar Fenceline - S Corner 06/03/2024 8 AM 11 Good Hangar Fenceline - S Side 06/03/2024 8 AM 13 Good Hangar Fenceline - SW Corner 06/03/2024 8 AM 11 Good Hangar Fenceline - SW Side 06/03/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period Ending 06/03/2024 8 AM Particulate Matter 12 Level of Concern Good Legacy Road 06/03/2024 8 AM 11 Good Moffett and Tustin Ranch 06/03/2024 8 AM 16 Good Valencia and Armstrong 06/03/2024 8 AM 11 Good Valencia and Columbus Square 06/03/2024 8 AM 9 Good Valencia and Legacy 06/03/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 06/03/2024 8 AM 10 Good Warner and Armstrong 06/03/2024 8 AM 11 Good Warner Avenue 06/03/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous04 Health warning of emergencyconditions: more ever• - is likely • be affected. Tuesday, June, 04, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/04/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 06/04/2024 8 AM 15 Good Hangar Fenceline - N Center 06/04/2024 8 AM 9 Good Hangar Fenceline - N Corner 06/04/2024 8 AM 16 Good Hangar Fenceline - NE Corner 06/04/2024 8 AM 15 Good Hangar Fenceline - NE Side 06/04/2024 8 AM 17 Good Hangar Fenceline - S Corner 06/04/2024 8 AM 16 Good Hangar Fenceline - S Side 06/04/2024 8 AM 18 Good Hangar Fenceline - SW Corner 06/04/2024 8 AM 16 Good Hangar Fenceline - SW Side 06/04/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/04/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 06/04/2024 8 AM 16 Good Moffett and Tustin Ranch 06/04/2024 8 AM 20 Good Valencia and Armstrong 06/04/2024 8 AM 16 Good Valencia and Columbus Square 06/04/2024 8 AM 14 Good Valencia and Legacy 06/04/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 06/04/2024 8 AM 14 Good Warner and Armstrong 06/04/2024 8 AM 16 Good Warner Avenue -7 06/04/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, June, 05, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/05/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 06/05/2024 8 AM 17 Good Hangar Fenceline - N Center 06/05/2024 8 AM 11 Good Hangar Fenceline - N Corner 06/05/2024 8 AM 18 Good Hangar Fenceline - NE Corner 06/05/2024 8 AM 18 Good Hangar Fenceline - NE Side 06/05/2024 8 AM 20 Good Hangar Fenceline - S Corner 06/05/2024 8 AM 18 Good Hangar Fenceline - S Side 06/05/2024 8 AM 21 Good Hangar Fenceline - SW Corner 06/05/2024 8 AM 18 Good Hangar Fenceline - SW Side 06/05/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/05/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 06/05/2024 8 AM 18 Good Moffett and Tustin Ranch 06/05/2024 8 AM 23 Good Valencia and Armstrong 06/05/2024 8 AM 18 Good Valencia and Columbus Square 06/05/2024 8 AM 15 Good Valencia and Legacy 06/05/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 06/05/2024 8 AM 16 Good Warner and Armstrong 06/05/2024 8 AM 21 Good Warner Avenue -7 06/05/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, June, 06, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/06/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 06/06/2024 8 AM 18 Good Hangar Fenceline - N Center 06/06/2024 8 AM 10 Good Hangar Fenceline - N Corner 06/06/2024 8 AM 19 Good Hangar Fenceline - NE Corner 06/06/2024 8 AM 18 Good Hangar Fenceline - NE Side 06/06/2024 8 AM 20 Good Hangar Fenceline - S Corner 06/06/2024 8 AM 19 Good Hangar Fenceline - S Side 06/06/2024 8 AM 20 Good Hangar Fenceline - SW Corner 06/06/2024 8 AM 18 Good Hangar Fenceline - SW Side 06/06/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/06/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 06/06/2024 8 AM 22 Good Moffett and Tustin Ranch 06/06/2024 8 AM 24 Good Valencia and Armstrong 06/06/2024 8 AM 19 Good Valencia and Columbus Square 06/06/2024 8 AM 16 Good Valencia and Legacy 06/06/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 06/06/2024 8 AM 17 Good Warner and Armstrong 06/06/2024 8 AM 19 Good Warner Avenue 06/06/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, June, 07, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/07/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 06/07/2024 8 AM 11 Good Hangar Fenceline - N Center 06/07/2024 8 AM 9 Good Hangar Fenceline - N Corner 06/07/2024 8 AM 12 Good Hangar Fenceline - NE Corner 06/07/2024 8 AM 11 Good Hangar Fenceline - NE Side 06/07/2024 8 AM 12 Good Hangar Fenceline - S Corner 06/07/2024 8 AM 12 Good Hangar Fenceline - S Side 06/07/2024 8 AM 14 Good Hangar Fenceline - SW Corner 06/07/2024 8 AM 12 Good Hangar Fenceline - SW Side 06/07/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/07/2024 8 AM Particulate Matter • 12 Level of Concern Good Legacy Road 06/07/2024 8 AM 13 Good Moffett and Tustin Ranch 06/07/2024 8 AM 16 Good Valencia and Armstrong 06/07/2024 8 AM 12 Good Valencia and Columbus Square 06/07/2024 8 AM 10 Good Valencia and Legacy 06/07/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 06/07/2024 8 AM 11 Good Warner and Armstrong 06/07/2024 8 AM 18 Good Warner Avenue 06/07/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, June, 08, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/08/2024 8 AM Matter 6 Level of Concern Good Hangar Fenceline - E Side 06/08/2024 8 AM 7 Good Hangar Fenceline - N Center 06/08/2024 8 AM 5 Good Hangar Fenceline - N Corner 06/08/2024 8 AM 8 Good Hangar Fenceline - NE Corner 06/08/2024 8 AM 7 Good Hangar Fenceline - NE Side 06/08/2024 8 AM 9 Good Hangar Fenceline - S Corner 06/08/2024 8 AM 8 Good Hangar Fenceline - S Side 06/08/2024 8 AM 10 Good Hangar Fenceline - SW Corner 06/08/2024 8 AM 8 Good Hangar Fenceline - SW Side 06/08/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/08/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 06/08/2024 8 AM 8 Good Moffett and Tustin Ranch 06/08/2024 8 AM 12 Good Valencia and Armstrong 06/08/2024 8 AM 8 Good Valencia and Columbus Square 06/08/2024 8 AM 7 Good Valencia and Legacy 06/08/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 06/08/2024 8 AM 7 Good Warner and Armstrong 06/08/2024 8 AM 10 Good Warner Avenue 06/08/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, June, 09, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/09/2024 8 AM Matter 4 Level of Concern Good Hangar Fenceline - E Side 06/09/2024 8 AM 5 Good Hangar Fenceline - N Center 06/09/2024 8 AM 3 Good Hangar Fenceline - N Corner 06/09/2024 8 AM 5 Good Hangar Fenceline - NE Corner 06/09/2024 8 AM 5 Good Hangar Fenceline - NE Side 06/09/2024 8 AM 6 Good Hangar Fenceline - S Corner 06/09/2024 8 AM 5 Good Hangar Fenceline - S Side 06/09/2024 8 AM 8 Good Hangar Fenceline - SW Corner 06/09/2024 8 AM 5 Good Hangar Fenceline - SW Side 06/09/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/09/2024 8 AM Particulate Matter • 5 Level of Concern Good Legacy Road 06/09/2024 8 AM 5 Good Moffett and Tustin Ranch 06/09/2024 8 AM 9 Good Valencia and Armstrong 06/09/2024 8 AM 5 Good Valencia and Columbus Square 06/09/2024 8 AM 5 Good Valencia and Legacy 06/09/2024 8 AM 7 Good Victory and Tustin Ranch Rd. 06/09/2024 8 AM 5 Good Warner and Armstrong 06/09/2024 8 AM 10 Good Warner Avenue -7 06/09/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, June, 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/10/2024 8 AM Matter 6 Level of Concern Good Hangar Fenceline - E Side 06/10/2024 8 AM 7 Good Hangar Fenceline - N Center 06/10/2024 8 AM 5 Good Hangar Fenceline - N Corner 06/10/2024 8 AM 8 Good Hangar Fenceline - NE Corner 06/10/2024 8 AM 7 Good Hangar Fenceline - NE Side 06/10/2024 8 AM 9 Good Hangar Fenceline - S Corner 06/10/2024 8 AM 8 Good Hangar Fenceline - S Side 06/10/2024 8 AM 10 Good Hangar Fenceline - SW Corner 06/10/2024 8 AM 8 Good Hangar Fenceline - SW Side 06/10/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/10/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 06/10/2024 8 AM 9 Good Moffett and Tustin Ranch 06/10/2024 8 AM 12 Good Valencia and Armstrong 06/10/2024 8 AM 7 Good Valencia and Columbus Square 06/10/2024 8 AM 7 Good Valencia and Legacy 06/10/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 06/10/2024 8 AM 7 Good Warner and Armstrong 06/10/2024 8 AM 10 Good Warner Avenue 06/10/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, June, 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/11/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 06/11/2024 8 AM 18 Good Hangar Fenceline - N Center 06/11/2024 8 AM 11 Good Hangar Fenceline - N Corner 06/11/2024 8 AM 19 Good Hangar Fenceline - NE Corner 06/11/2024 8 AM 18 Good Hangar Fenceline - NE Side 06/11/2024 8 AM 20 Good Hangar Fenceline - S Corner 06/11/2024 8 AM 19 Good Hangar Fenceline - S Side 06/11/2024 8 AM 23 Good Hangar Fenceline - SW Corner 06/11/2024 8 AM 19 Good Hangar Fenceline - SW Side 06/11/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/11/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 06/11/2024 8 AM 21 Good Moffett and Tustin Ranch 06/11/2024 8 AM 24 Good Valencia and Armstrong 06/11/2024 8 AM 19 Good Valencia and Columbus Square 06/11/2024 8 AM 15 Good Valencia and Legacy 06/11/2024 8 AM 24 Good Victory and Tustin Ranch Rd. 06/11/2024 8 AM 16 Good Warner and Armstrong 06/11/2024 8 AM 19 Good Warner Avenue 06/11/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, June, 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/12/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 06/12/2024 8 AM 13 Good Hangar Fenceline - N Center 06/12/2024 8 AM 7 Good Hangar Fenceline - N Corner 06/12/2024 8 AM 14 Good Hangar Fenceline - NE Corner 06/12/2024 8 AM 13 Good Hangar Fenceline - NE Side 06/12/2024 8 AM 15 Good Hangar Fenceline - S Corner 06/12/2024 8 AM 14 Good Hangar Fenceline - S Side 06/12/2024 8 AM 17 Good Hangar Fenceline - SW Corner 06/12/2024 8 AM 14 Good Hangar Fenceline - SW Side 06/12/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/12/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 06/12/2024 8 AM 17 Good Moffett and Tustin Ranch 06/12/2024 8 AM 18 Good Valencia and Armstrong 06/12/2024 8 AM 14 Good Valencia and Columbus Square 06/12/2024 8 AM 12 Good Valencia and Legacy 06/12/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 06/12/2024 8 AM 12 Good Warner and Armstrong 06/12/2024 8 AM 16 Good Warner Avenue -7 06/12/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, June, 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/13/2024 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 06/13/2024 8 AM 12 Good Hangar Fenceline - N Center 06/13/2024 8 AM 7 Good Hangar Fenceline - N Corner 06/13/2024 8 AM 13 Good Hangar Fenceline - NE Corner 06/13/2024 8 AM 15 Good Hangar Fenceline - NE Side 06/13/2024 8 AM 15 Good Hangar Fenceline - S Corner 06/13/2024 8 AM 13 Good Hangar Fenceline - S Side 06/13/2024 8 AM 17 Good Hangar Fenceline - SW Corner 06/13/2024 8 AM 14 Good Hangar Fenceline - SW Side 06/13/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/13/2024 8 AM Particulate Matter • 13 Level of Concern Good Legacy Road 06/13/2024 8 AM 18 Good Moffett and Tustin Ranch 06/13/2024 8 AM 16 Good Valencia and Armstrong 06/13/2024 8 AM 14 Good Valencia and Columbus Square 06/13/2024 8 AM 12 Good Valencia and Legacy 06/13/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 06/13/2024 8 AM 12 Good Warner and Armstrong 06/13/2024 8 AM 15 Good Warner Avenue 06/13/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, June, 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/14/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 06/14/2024 8 AM 17 Good Hangar Fenceline - N Center 06/14/2024 8 AM 9 Good Hangar Fenceline - N Corner 06/14/2024 8 AM 16 Good Hangar Fenceline - NE Corner 06/14/2024 8 AM 15 Good Hangar Fenceline - NE Side 06/14/2024 8 AM 17 Good Hangar Fenceline - S Corner 06/14/2024 8 AM 16 Good Hangar Fenceline - S Side 06/14/2024 8 AM 20 Good Hangar Fenceline - SW Corner 06/14/2024 8 AM 17 Good Hangar Fenceline - SW Side 06/14/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/14/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 06/14/2024 8 AM 26 Good Moffett and Tustin Ranch 06/14/2024 8 AM 19 Good Valencia and Armstrong 06/14/2024 8 AM 16 Good Valencia and Columbus Square 06/14/2024 8 AM 15 Good Valencia and Legacy 06/14/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 06/14/2024 8 AM 14 Good Warner and Armstrong 06/14/2024 8 AM 17 Good Warner Avenue 06/14/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, June, 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/15/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 06/15/2024 8 AM 19 Good Hangar Fenceline - N Center 06/15/2024 8 AM 8 Good Hangar Fenceline - N Corner 06/15/2024 8 AM 18 Good Hangar Fenceline - NE Corner 06/15/2024 8 AM 17 Good Hangar Fenceline - NE Side 06/15/2024 8 AM 17 Good Hangar Fenceline - S Corner 06/15/2024 8 AM 19 Good Hangar Fenceline - S Side 06/15/2024 8 AM 22 Good Hangar Fenceline - SW Corner 06/15/2024 8 AM 18 Good Hangar Fenceline - SW Side 06/15/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/15/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 06/15/2024 8 AM 27 Good Moffett and Tustin Ranch 06/15/2024 8 AM 25 Good Valencia and Armstrong 06/15/2024 8 AM 19 Good Valencia and Columbus Square 06/15/2024 8 AM 15 Good Valencia and Legacy 06/15/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 06/15/2024 8 AM 16 Good Warner and Armstrong 06/15/2024 8 AM 20 Good Warner Avenue -7 06/15/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, June, 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/16/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 06/16/2024 8 AM 22 Good Hangar Fenceline - N Center 06/16/2024 8 AM 8 Good Hangar Fenceline - N Corner 06/16/2024 8 AM 21 Good Hangar Fenceline - NE Corner 06/16/2024 8 AM 22 Good Hangar Fenceline - NE Side 06/16/2024 8 AM 21 Good Hangar Fenceline - S Corner 06/16/2024 8 AM 22 Good Hangar Fenceline - S Side 06/16/2024 8 AM 26 Good Hangar Fenceline - SW Corner 06/16/2024 8 AM 23 Good Hangar Fenceline - SW Side 06/16/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/16/2024 8 AM Particulate Matter • 24 Level of Concern Good Legacy Road 06/16/2024 8 AM 31 Good Moffett and Tustin Ranch 06/16/2024 8 AM 31 Good Valencia and Armstrong 06/16/2024 8 AM 22 Good Valencia and Columbus Square 06/16/2024 8 AM 17 Good Valencia and Legacy 06/16/2024 8 AM 33 Good Victory and Tustin Ranch Rd. 06/16/2024 8 AM 17 Good Warner and Armstrong 06/16/2024 8 AM 20 Good Warner Avenue 06/16/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, June, 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/17/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 06/17/2024 8 AM 22 Good Hangar Fenceline - N Center 06/17/2024 8 AM 4 Good Hangar Fenceline - N Corner 06/17/2024 8 AM 21 Good Hangar Fenceline - NE Corner 06/17/2024 8 AM 22 Good Hangar Fenceline - NE Side 06/17/2024 8 AM 20 Good Hangar Fenceline - S Corner 06/17/2024 8 AM 21 Good Hangar Fenceline - S Side 06/17/2024 8 AM 27 Good Hangar Fenceline - SW Corner 06/17/2024 8 AM 23 Good Hangar Fenceline - SW Side 06/17/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/17/2024 8 AM Particulate Matter • 24 Level of Concern Good Legacy Road 06/17/2024 8 AM 28 Good Moffett and Tustin Ranch 06/17/2024 8 AM 30 Good Valencia and Armstrong 06/17/2024 8 AM 22 Good Valencia and Columbus Square 06/17/2024 8 AM 17 Good Valencia and Legacy 06/17/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 06/17/2024 8 AM 16 Good Warner and Armstrong 06/17/2024 8 AM 18 Good Warner Avenue 06/17/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, June, 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/18/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 06/18/2024 8 AM 21 Good Hangar Fenceline - N Center 06/18/2024 8 AM 21 Good Hangar Fenceline - N Corner 06/18/2024 8 AM 21 Good Hangar Fenceline - NE Corner 06/18/2024 8 AM 21 Good Hangar Fenceline - NE Side 06/18/2024 8 AM 20 Good Hangar Fenceline - S Corner 06/18/2024 8 AM 21 Good Hangar Fenceline - S Side 06/18/2024 8 AM 27 Good Hangar Fenceline - SW Corner 06/18/2024 8 AM 22 Good Hangar Fenceline - SW Side 06/18/2024 8 AM 25 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/18/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 06/18/2024 8 AM 25 Good Moffett and Tustin Ranch 06/18/2024 8 AM 34 Good Valencia and Armstrong 06/18/2024 8 AM 22 Good Valencia and Columbus Square 06/18/2024 8 AM 16 Good Valencia and Legacy 06/18/2024 8 AM 28 Good Victory and Tustin Ranch Rd. 06/18/2024 8 AM 18 Good Warner and Armstrong 06/18/2024 8 AM 18 Good Warner Avenue -7 06/18/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, June, 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/19/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 06/19/2024 8 AM 16 Good Hangar Fenceline - N Center 06/19/2024 8 AM 22 Good Hangar Fenceline - N Corner 06/19/2024 8 AM 17 Good Hangar Fenceline - NE Corner 06/19/2024 8 AM 17 Good Hangar Fenceline - NE Side 06/19/2024 8 AM 18 Good Hangar Fenceline - S Corner 06/19/2024 8 AM 17 Good Hangar Fenceline - S Side 06/19/2024 8 AM 22 Good Hangar Fenceline - SW Corner 06/19/2024 8 AM 19 Good Hangar Fenceline - SW Side 06/19/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/19/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 06/19/2024 8 AM 22 Good Moffett and Tustin Ranch 06/19/2024 8 AM 27 Good Valencia and Armstrong 06/19/2024 8 AM 18 Good Valencia and Columbus Square 06/19/2024 8 AM 13 Good Valencia and Legacy 06/19/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 06/19/2024 8 AM 15 Good Warner and Armstrong 06/19/2024 8 AM 19 Good Warner Avenue -706/19/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, June, 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/20/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 06/20/2024 8 AM 19 Good Hangar Fenceline - N Center 06/20/2024 8 AM 24 Good Hangar Fenceline - N Corner 06/20/2024 8 AM 19 Good Hangar Fenceline - NE Corner 06/20/2024 8 AM 18 Good Hangar Fenceline - NE Side 06/20/2024 8 AM 21 Good Hangar Fenceline - S Corner 06/20/2024 8 AM 19 Good Hangar Fenceline - S Side 06/20/2024 8 AM 23 Good Hangar Fenceline - SW Corner 06/20/2024 8 AM 20 Good Hangar Fenceline - SW Side 06/20/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/20/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 06/20/2024 8 AM 23 Good Moffett and Tustin Ranch 06/20/2024 8 AM 28 Good Valencia and Armstrong 06/20/2024 8 AM 20 Good Valencia and Columbus Square 06/20/2024 8 AM 15 Good Valencia and Legacy 06/20/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 06/20/2024 8 AM 16 Good Warner and Armstrong 06/20/2024 8 AM 26 Good Warner Avenue -7 06/20/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, June, 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/21/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 06/21/2024 8 AM 16 Good Hangar Fenceline - N Center 06/21/2024 8 AM 19 Good Hangar Fenceline - N Corner 06/21/2024 8 AM 16 Good Hangar Fenceline - NE Corner 06/21/2024 8 AM 16 Good Hangar Fenceline - NE Side 06/21/2024 8 AM 16 Good Hangar Fenceline - S Corner 06/21/2024 8 AM 17 Good Hangar Fenceline - S Side 06/21/2024 8 AM 20 Good Hangar Fenceline - SW Corner 06/21/2024 8 AM 17 Good Hangar Fenceline - SW Side 06/21/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/21/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 06/21/2024 8 AM 21 Good Moffett and Tustin Ranch 06/21/2024 8 AM 24 Good Valencia and Armstrong 06/21/2024 8 AM 17 Good Valencia and Columbus Square 06/21/2024 8 AM 13 Good Valencia and Legacy 06/21/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 06/21/2024 8 AM 14 Good Warner and Armstrong 06/21/2024 8 AM 17 Good Warner Avenue 06/21/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, June, 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/22/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 06/22/2024 8 AM 18 Good Hangar Fenceline - N Center 06/22/2024 8 AM 20 Good Hangar Fenceline - N Corner 06/22/2024 8 AM 17 Good Hangar Fenceline - NE Corner 06/22/2024 8 AM 17 Good Hangar Fenceline - NE Side 06/22/2024 8 AM 17 Good Hangar Fenceline - S Corner 06/22/2024 8 AM 18 Good Hangar Fenceline - S Side 06/22/2024 8 AM 21 Good Hangar Fenceline - SW Corner 06/22/2024 8 AM 22 Good Hangar Fenceline - SW Side 06/22/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/22/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 06/22/2024 8 AM 23 Good Moffett and Tustin Ranch 06/22/2024 8 AM 25 Good Valencia and Armstrong 06/22/2024 8 AM 18 Good Valencia and Columbus Square 06/22/2024 8 AM 14 Good Valencia and Legacy 06/22/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 06/22/2024 8 AM 6 Good Warner and Armstrong 06/22/2024 8 AM 17 Good Warner Avenue 06/22/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, June, 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/23/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 06/23/2024 8 AM 19 Good Hangar Fenceline - N Center 06/23/2024 8 AM 24 Good Hangar Fenceline - N Corner 06/23/2024 8 AM 19 Good Hangar Fenceline - NE Corner 06/23/2024 8 AM 19 Good Hangar Fenceline - NE Side 06/23/2024 8 AM 19 Good Hangar Fenceline - S Corner 06/23/2024 8 AM 20 Good Hangar Fenceline - S Side 06/23/2024 8 AM 22 Good Hangar Fenceline - SW Corner 06/23/2024 8 AM 21 Good Hangar Fenceline - SW Side 06/23/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/23/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 06/23/2024 8 AM 25 Good Moffett and Tustin Ranch 06/23/2024 8 AM 26 Good Valencia and Armstrong 06/23/2024 8 AM 20 Good Valencia and Columbus Square 06/23/2024 8 AM 16 Good Valencia and Legacy 06/23/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 06/23/2024 8 AM 18 Good Warner and Armstrong 06/23/2024 8 AM 19 Good Warner Avenue -7 06/23/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, June, 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/24/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 06/24/2024 8 AM 18 Good Hangar Fenceline - N Center 06/24/2024 8 AM 16 Good Hangar Fenceline - N Corner 06/24/2024 8 AM 17 Good Hangar Fenceline - NE Corner 06/24/2024 8 AM 16 Good Hangar Fenceline - NE Side 06/24/2024 8 AM 19 Good Hangar Fenceline - S Corner 06/24/2024 8 AM 16 Good Hangar Fenceline - S Side 06/24/2024 8 AM 14 Good Hangar Fenceline - SW Corner 06/24/2024 8 AM 16 Good Hangar Fenceline - SW Side 06/24/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/24/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 06/24/2024 8 AM 25 Good Moffett and Tustin Ranch 06/24/2024 8 AM 21 Good Valencia and Armstrong 06/24/2024 8 AM 18 Good Valencia and Columbus Square 06/24/2024 8 AM 17 Good Valencia and Legacy 06/24/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 06/24/2024 8 AM 19 Good Warner and Armstrong 06/24/2024 8 AM 22 Good Warner Avenue -7 06/24/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, June, 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/25/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 06/25/2024 8 AM 12 Good Hangar Fenceline - N Center 06/25/2024 8 AM 11 Good Hangar Fenceline - N Corner 06/25/2024 8 AM 11 Good Hangar Fenceline - NE Corner 06/25/2024 8 AM 10 Good Hangar Fenceline - NE Side 06/25/2024 8 AM 14 Good Hangar Fenceline - S Corner 06/25/2024 8 AM 13 Good Hangar Fenceline - S Side 06/25/2024 8 AM 14 Good Hangar Fenceline - SW Corner 06/25/2024 8 AM 13 Good Hangar Fenceline - SW Side 06/25/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/25/2024 8 AM Particulate Matter • 13 Level of Concern Good Legacy Road 06/25/2024 8 AM 19 Good Moffett and Tustin Ranch 06/25/2024 8 AM 21 Good Valencia and Armstrong 06/25/2024 8 AM 12 Good Valencia and Columbus Square 06/25/2024 8 AM 11 Good Valencia and Legacy 06/25/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 06/25/2024 8 AM 12 Good Warner and Armstrong 06/25/2024 8 AM 18 Good Warner Avenue -7 06/25/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, June, 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/26/2024 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 06/26/2024 8 AM 12 Good Hangar Fenceline - N Center 06/26/2024 8 AM 13 Good Hangar Fenceline - N Corner 06/26/2024 8 AM 12 Good Hangar Fenceline - NE Corner 06/26/2024 8 AM 10 Good Hangar Fenceline - NE Side 06/26/2024 8 AM 14 Good Hangar Fenceline - S Corner 06/26/2024 8 AM 12 Good Hangar Fenceline - S Side 06/26/2024 8 AM 14 Good Hangar Fenceline - SW Corner 06/26/2024 8 AM 13 Good Hangar Fenceline - SW Side 06/26/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/26/2024 8 AM Particulate Matter • 13 Level of Concern Good Legacy Road 06/26/2024 8 AM 17 Good Moffett and Tustin Ranch 06/26/2024 8 AM 20 Good Valencia and Armstrong 06/26/2024 8 AM 13 Good Valencia and Columbus Square 06/26/2024 8 AM 11 Good Valencia and Legacy 06/26/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 06/26/2024 8 AM 11 Good Warner and Armstrong 06/26/2024 8 AM 13 Good Warner Avenue -7 06/26/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, June, 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/27/2024 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 06/27/2024 8 AM 13 Good Hangar Fenceline - N Center 06/27/2024 8 AM 13 Good Hangar Fenceline - N Corner 06/27/2024 8 AM 13 Good Hangar Fenceline - NE Corner 06/27/2024 8 AM 13 Good Hangar Fenceline - NE Side 06/27/2024 8 AM 14 Good Hangar Fenceline - S Corner 06/27/2024 8 AM 13 Good Hangar Fenceline - S Side 06/27/2024 8 AM 15 Good Hangar Fenceline - SW Corner 06/27/2024 8 AM 14 Good Hangar Fenceline - SW Side 06/27/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/27/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 06/27/2024 8 AM 17 Good Moffett and Tustin Ranch 06/27/2024 8 AM 20 Good Valencia and Armstrong 06/27/2024 8 AM 13 Good Valencia and Columbus Square 06/27/2024 8 AM 11 Good Valencia and Legacy 06/27/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 06/27/2024 8 AM 12 Good Warner and Armstrong 06/27/2024 8 AM 11 Good Warner Avenue 06/27/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, June, 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/28/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 06/28/2024 8 AM 13 Good Hangar Fenceline - N Center 06/28/2024 8 AM 17 Good Hangar Fenceline - N Corner 06/28/2024 8 AM 15 Good Hangar Fenceline - NE Corner 06/28/2024 8 AM 15 Good Hangar Fenceline - NE Side 06/28/2024 8 AM 14 Good Hangar Fenceline - S Corner 06/28/2024 8 AM 15 Good Hangar Fenceline - S Side 06/28/2024 8 AM 18 Good Hangar Fenceline - SW Corner 06/28/2024 8 AM 17 Good Hangar Fenceline - SW Side 06/28/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/28/2024 8 AM Particulate Matter • 15 Level of Concern Good Legacy Road 06/28/2024 8 AM 19 Good Moffett and Tustin Ranch 06/28/2024 8 AM 21 Good Valencia and Armstrong 06/28/2024 8 AM 15 Good Valencia and Columbus Square 06/28/2024 8 AM 12 Good Valencia and Legacy 06/28/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 06/28/2024 8 AM 13 Good Warner and Armstrong 06/28/2024 8 AM 12 Good Warner Avenue -7 06/28/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, June, 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/29/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 06/29/2024 8 AM 14 Good Hangar Fenceline - N Center 06/29/2024 8 AM 19 Good Hangar Fenceline - N Corner 06/29/2024 8 AM 16 Good Hangar Fenceline - NE Corner 06/29/2024 8 AM 15 Good Hangar Fenceline - NE Side 06/29/2024 8 AM 16 Good Hangar Fenceline - S Corner 06/29/2024 8 AM 16 Good Hangar Fenceline - S Side 06/29/2024 8 AM 19 Good Hangar Fenceline - SW Corner 06/29/2024 8 AM 18 Good Hangar Fenceline - SW Side 06/29/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/29/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 06/29/2024 8 AM 20 Good Moffett and Tustin Ranch 06/29/2024 8 AM 22 Good Valencia and Armstrong 06/29/2024 8 AM 16 Good Valencia and Columbus Square 06/29/2024 8 AM 13 Good Valencia and Legacy 06/29/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 06/29/2024 8 AM 13 Good Warner and Armstrong 06/29/2024 8 AM 18 Good Warner Avenue -7 06/29/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, June, 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 06/30/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 06/30/2024 8 AM 22 Good Hangar Fenceline - N Center 06/30/2024 8 AM 27 Good Hangar Fenceline - N Corner 06/30/2024 8 AM 23 Good Hangar Fenceline - NE Corner 06/30/2024 8 AM 22 Good Hangar Fenceline - NE Side 06/30/2024 8 AM 22 Good Hangar Fenceline - S Corner 06/30/2024 8 AM 23 Good Hangar Fenceline - S Side 06/30/2024 8 AM 26 Good Hangar Fenceline - SW Corner 06/30/2024 8 AM 24 Good Hangar Fenceline - SW Side 06/30/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 06/30/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 06/30/2024 8 AM 29 Good Moffett and Tustin Ranch 06/30/2024 8 AM 32 Good Valencia and Armstrong 06/30/2024 8 AM 24 Good Valencia and Columbus Square 06/30/2024 8 AM 19 Good Valencia and Legacy 06/30/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 06/30/2024 8 AM 21 Good Warner and Armstrong 06/30/2024 8 AM 21 Good Warner Avenue -7 06/30/2024 8 AM 24 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, July, 01, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy (355 to 424) Location Columbus Square Park 24-Hour Period Ending 07/01/2024 8 AM • 15 Good Hangar Fenceline - E Side 07/01/2024 8 AM 21 Good Hangar Fenceline - N Center 07/01/2024 8 AM 21 Good Hangar Fenceline - N Corner 07/01/2024 8 AM 20 Good Hangar Fenceline - NE Corner 07/01/2024 8 AM 19 Good Hangar Fenceline - NE Side 07/01/2024 8 AM 19 Good Hangar Fenceline - S Corner 07/01/2024 8 AM 20 Good Hangar Fenceline - S Side 07/01/2024 8 AM 21 Good Hangar Fenceline - SW Corner 07/01/2024 8 AM 19 Good Hangar Fenceline - SW Side 07/01/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period Ending 07/01/2024 8 AM Particulate Matter 20 Level of Concern Good Legacy Road 07/01/2024 8 AM 24 Good Moffett and Tustin Ranch 07/01/2024 8 AM 24 Good Valencia and Armstrong 07/01/2024 8 AM 19 Good Valencia and Columbus Square 07/01/2024 8 AM 18 Good Valencia and Legacy 07/01/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 07/01/2024 8 AM 19 Good Warner and Armstrong 07/01/2024 8 AM 22 Good Warner Avenue 07/01/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous04 Health warning of emergencyconditions: more ever• - is likely • be affected. Tuesday, July, 02, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/02/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 07/02/2024 8 AM 15 Good Hangar Fenceline - N Center 07/02/2024 8 AM 17 Good Hangar Fenceline - N Corner 07/02/2024 8 AM 15 Good Hangar Fenceline - NE Corner 07/02/2024 8 AM 16 Good Hangar Fenceline - NE Side 07/02/2024 8 AM 15 Good Hangar Fenceline - S Corner 07/02/2024 8 AM 15 Good Hangar Fenceline - S Side 07/02/2024 8 AM 18 Good Hangar Fenceline - SW Corner 07/02/2024 8 AM 17 Good Hangar Fenceline - SW Side 07/02/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/02/2024 8 AM Particulate Matter • 15 Level of Concern Good Legacy Road 07/02/2024 8 AM 13 Good Moffett and Tustin Ranch 07/02/2024 8 AM 19 Good Valencia and Armstrong 07/02/2024 8 AM 16 Good Valencia and Columbus Square 07/02/2024 8 AM 14 Good Valencia and Legacy 07/02/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 07/02/2024 8 AM 15 Good Warner and Armstrong 07/02/2024 8 AM 20 Good Warner Avenue 07/02/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, July, 03, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/03/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 07/03/2024 8 AM 20 Good Hangar Fenceline - N Center 07/03/2024 8 AM 24 Good Hangar Fenceline - N Corner 07/03/2024 8 AM 21 Good Hangar Fenceline - NE Corner 07/03/2024 8 AM 20 Good Hangar Fenceline - NE Side 07/03/2024 8 AM 20 Good Hangar Fenceline - S Corner 07/03/2024 8 AM 20 Good Hangar Fenceline - S Side 07/03/2024 8 AM 23 Good Hangar Fenceline - SW Corner 07/03/2024 8 AM 23 Good Hangar Fenceline - SW Side 07/03/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/03/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 07/03/2024 8 AM 18 Good Moffett and Tustin Ranch 07/03/2024 8 AM 27 Good Valencia and Armstrong 07/03/2024 8 AM 21 Good Valencia and Columbus Square 07/03/2024 8 AM 17 Good Valencia and Legacy 07/03/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 07/03/2024 8 AM 19 Good Warner and Armstrong 07/03/2024 8 AM 23 Good Warner Avenue 07/03/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, July, 04, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/04/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 07/04/2024 8 AM 22 Good Hangar Fenceline - N Center 07/04/2024 8 AM 21 Good Hangar Fenceline - N Corner 07/04/2024 8 AM 21 Good Hangar Fenceline - NE Corner 07/04/2024 8 AM 20 Good Hangar Fenceline - NE Side 07/04/2024 8 AM 21 Good Hangar Fenceline - S Corner 07/04/2024 8 AM 21 Good Hangar Fenceline - S Side 07/04/2024 8 AM 24 Good Hangar Fenceline - SW Corner 07/04/2024 8 AM 22 Good Hangar Fenceline - SW Side 07/04/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/04/2024 8 AM Particulate Matter • 21 Level of Concern Good Legacy Road 07/04/2024 8 AM 19 Good Moffett and Tustin Ranch 07/04/2024 8 AM 25 Good Valencia and Armstrong 07/04/2024 8 AM 21 Good Valencia and Columbus Square 07/04/2024 8 AM 19 Good Valencia and Legacy 07/04/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 07/04/2024 8 AM 20 Good Warner and Armstrong 07/04/2024 8 AM 22 Good Warner Avenue 07/04/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, July, 05, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/05/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 07/05/2024 8 AM 21 Good Hangar Fenceline - N Center 07/05/2024 8 AM 24 Good Hangar Fenceline - N Corner 07/05/2024 8 AM 22 Good Hangar Fenceline - NE Corner 07/05/2024 8 AM 21 Good Hangar Fenceline - NE Side 07/05/2024 8 AM 21 Good Hangar Fenceline - S Corner 07/05/2024 8 AM 21 Good Hangar Fenceline - S Side 07/05/2024 8 AM 25 Good Hangar Fenceline - SW Corner 07/05/2024 8 AM 23 Good Hangar Fenceline - SW Side 07/05/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/05/2024 8 AM Particulate Matter • 21 Level of Concern Good Legacy Road 07/05/2024 8 AM 19 Good Moffett and Tustin Ranch 07/05/2024 8 AM 30 Good Valencia and Armstrong 07/05/2024 8 AM 22 Good Valencia and Columbus Square 07/05/2024 8 AM 19 Good Valencia and Legacy 07/05/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 07/05/2024 8 AM 24 Good Warner and Armstrong 07/05/2024 8 AM 30 Good Warner Avenue 07/05/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, July, 06, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/06/2024 8 AM Matter 21 Level of Concern Good Hangar Fenceline - E Side 07/06/2024 8 AM 26 Good Hangar Fenceline - N Center 07/06/2024 8 AM 28 Good Hangar Fenceline - N Corner 07/06/2024 8 AM 26 Good Hangar Fenceline - NE Corner 07/06/2024 8 AM 27 Good Hangar Fenceline - NE Side 07/06/2024 8 AM 27 Good Hangar Fenceline - S Corner 07/06/2024 8 AM 2S Good Hangar Fenceline - S Side 07/06/2024 8 AM 29 Good Hangar Fenceline - SW Corner 07/06/2024 8 AM 26 Good Hangar Fenceline - SW Side 07/06/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/06/2024 8 AM Particulate Matter • 26 Level of Concern Good Legacy Road 07/06/2024 8 AM 22 Good Moffett and Tustin Ranch 07/06/2024 8 AM 30 Good Valencia and Armstrong 07/06/2024 8 AM 26 Good Valencia and Columbus Square 07/06/2024 8 AM 23 Good Valencia and Legacy 07/06/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 07/06/2024 8 AM 25 Good Warner and Armstrong 07/06/2024 8 AM 30 Good Warner Avenue 07/06/2024 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, July, 07, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/07/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 07/07/2024 8 AM 18 Good Hangar Fenceline - N Center 07/07/2024 8 AM 22 Good Hangar Fenceline - N Corner 07/07/2024 8 AM 19 Good Hangar Fenceline - NE Corner 07/07/2024 8 AM 19 Good Hangar Fenceline - NE Side 07/07/2024 8 AM 19 Good Hangar Fenceline - S Corner 07/07/2024 8 AM 19 Good Hangar Fenceline - S Side 07/07/2024 8 AM 22 Good Hangar Fenceline - SW Corner 07/07/2024 8 AM 20 Good Hangar Fenceline - SW Side 07/07/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/07/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 07/07/2024 8 AM 18 Good Moffett and Tustin Ranch 07/07/2024 8 AM 23 Good Valencia and Armstrong 07/07/2024 8 AM 19 Good Valencia and Columbus Square 07/07/2024 8 AM 17 Good Valencia and Legacy 07/07/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 07/07/2024 8 AM 19 Good Warner and Armstrong 07/07/2024 8 AM 24 Good Warner Avenue 07/07/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, July, 08, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/08/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 07/08/2024 8 AM 17 Good Hangar Fenceline - N Center 07/08/2024 8 AM 18 Good Hangar Fenceline - N Corner 07/08/2024 8 AM 17 Good Hangar Fenceline - NE Corner 07/08/2024 8 AM 17 Good Hangar Fenceline - NE Side 07/08/2024 8 AM 18 Good Hangar Fenceline - S Corner 07/08/2024 8 AM 17 Good Hangar Fenceline - S Side 07/08/2024 8 AM 19 Good Hangar Fenceline - SW Corner 07/08/2024 8 AM 18 Good Hangar Fenceline - SW Side 07/08/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/08/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 07/08/2024 8 AM 16 Good Moffett and Tustin Ranch 07/08/2024 8 AM 22 Good Valencia and Armstrong 07/08/2024 8 AM 17 Good Valencia and Columbus Square 07/08/2024 8 AM 15 Good Valencia and Legacy 07/08/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 07/08/2024 8 AM 17 Good Warner and Armstrong 07/08/2024 8 AM 19 Good Warner Avenue 07/08/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, July, 09, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/09/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 07/09/2024 8 AM 22 Good Hangar Fenceline - N Center 07/09/2024 8 AM 21 Good Hangar Fenceline - N Corner 07/09/2024 8 AM 21 Good Hangar Fenceline - NE Corner 07/09/2024 8 AM 20 Good Hangar Fenceline - NE Side 07/09/2024 8 AM 22 Good Hangar Fenceline - S Corner 07/09/2024 8 AM 21 Good Hangar Fenceline - S Side 07/09/2024 8 AM 22 Good Hangar Fenceline - SW Corner 07/09/2024 8 AM 21 Good Hangar Fenceline - SW Side 07/09/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/09/2024 8 AM Particulate Matter • 21 Level of Concern Good Legacy Road 07/09/2024 8 AM 20 Good Moffett and Tustin Ranch 07/09/2024 8 AM 29 Good Valencia and Armstrong 07/09/2024 8 AM 22 Good Valencia and Columbus Square 07/09/2024 8 AM 18 Good Valencia and Legacy 07/09/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 07/09/2024 8 AM 21 Good Warner and Armstrong 07/09/2024 8 AM 23 Good Warner Avenue 07/09/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, July, 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/10/2024 8 AM Matter 23 Level of Concern Good Hangar Fenceline - E Side 07/10/2024 8 AM 29 Good Hangar Fenceline - N Center 07/10/2024 8 AM 31 Good Hangar Fenceline - N Corner 07/10/2024 8 AM 29 Good Hangar Fenceline - NE Corner 07/10/2024 8 AM 29 Good Hangar Fenceline - NE Side 07/10/2024 8 AM 31 Good Hangar Fenceline - S Corner 07/10/2024 8 AM 29 Good Hangar Fenceline - S Side 07/10/2024 8 AM 31 Good Hangar Fenceline - SW Corner 07/10/2024 8 AM 28 Good Hangar Fenceline - SW Side 07/10/2024 8 AM 29 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/10/2024 8 AM Particulate Matter • 29 Level of Concern Good Legacy Road 07/10/2024 8 AM 29 Good Moffett and Tustin Ranch 07/10/2024 8 AM 35 Good Valencia and Armstrong 07/10/2024 8 AM 30 Good Valencia and Columbus Square 07/10/2024 8 AM 26 Good Valencia and Legacy 07/10/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 07/10/2024 8 AM 28 Good Warner and Armstrong 07/10/2024 8 AM 32 Good Warner Avenue 07/10/2024 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, July, 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/11/2024 8 AM Matter 23 Level of Concern Good Hangar Fenceline - E Side 07/11/2024 8 AM 28 Good Hangar Fenceline - N Center 07/11/2024 8 AM 30 Good Hangar Fenceline - N Corner 07/11/2024 8 AM 29 Good Hangar Fenceline - NE Corner 07/11/2024 8 AM 29 Good Hangar Fenceline - NE Side 07/11/2024 8 AM 30 Good Hangar Fenceline - S Corner 07/11/2024 8 AM 29 Good Hangar Fenceline - S Side 07/11/2024 8 AM 32 Good Hangar Fenceline - SW Corner 07/11/2024 8 AM 29 Good Hangar Fenceline - SW Side 07/11/2024 8 AM 29 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/11/2024 8 AM Particulate Matter • 29 Level of Concern Good Legacy Road 07/11/2024 8 AM 29 Good Moffett and Tustin Ranch 07/11/2024 8 AM 34 Good Valencia and Armstrong 07/11/2024 8 AM 29 Good Valencia and Columbus Square 07/11/2024 8 AM 26 Good Valencia and Legacy 07/11/2024 8 AM 30 Good Victory and Tustin Ranch Rd. 07/11/2024 8 AM 27 Good Warner and Armstrong 07/11/2024 8 AM 32 Good Warner Avenue 07/11/2024 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, July, 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/12/2024 8 AM Matter 18 Level of Concern Good Hangar Fenceline - E Side 07/12/2024 8 AM 20 Good Hangar Fenceline - N Center 07/12/2024 8 AM 23 Good Hangar Fenceline - N Corner 07/12/2024 8 AM 21 Good Hangar Fenceline - NE Corner 07/12/2024 8 AM 21 Good Hangar Fenceline - NE Side 07/12/2024 8 AM 20 Good Hangar Fenceline - S Corner 07/12/2024 8 AM 21 Good Hangar Fenceline - S Side 07/12/2024 8 AM 23 Good Hangar Fenceline - SW Corner 07/12/2024 8 AM 21 Good Hangar Fenceline - SW Side 07/12/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/12/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 07/12/2024 8 AM 21 Good Moffett and Tustin Ranch 07/12/2024 8 AM 24 Good Valencia and Armstrong 07/12/2024 8 AM 21 Good Valencia and Columbus Square 07/12/2024 8 AM 18 Good Valencia and Legacy 07/12/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 07/12/2024 8 AM 20 Good Warner and Armstrong 07/12/2024 8 AM 24 Good Warner Avenue 07/12/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, July, 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/13/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 07/13/2024 8 AM 19 Good Hangar Fenceline - N Center 07/13/2024 8 AM 21 Good Hangar Fenceline - N Corner 07/13/2024 8 AM 24 Good Hangar Fenceline - NE Corner 07/13/2024 8 AM 20 Good Hangar Fenceline - NE Side 07/13/2024 8 AM 21 Good Hangar Fenceline - S Corner 07/13/2024 8 AM 20 Good Hangar Fenceline - S Side 07/13/2024 8 AM 22 Good Hangar Fenceline - SW Corner 07/13/2024 8 AM 20 Good Hangar Fenceline - SW Side 07/13/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/13/2024 8 AM Particulate Matter • 24 Level of Concern Good Legacy Road 07/13/2024 8 AM 19 Good Moffett and Tustin Ranch 07/13/2024 8 AM 22 Good Valencia and Armstrong 07/13/2024 8 AM 20 Good Valencia and Columbus Square 07/13/2024 8 AM 17 Good Valencia and Legacy 07/13/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 07/13/2024 8 AM 19 Good Warner and Armstrong 07/13/2024 8 AM 21 Good Warner Avenue 07/13/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, July, 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/14/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 07/14/2024 8 AM 14 Good Hangar Fenceline - N Center 07/14/2024 8 AM 17 Good Hangar Fenceline - N Corner 07/14/2024 8 AM 14 Good Hangar Fenceline - NE Corner 07/14/2024 8 AM 15 Good Hangar Fenceline - NE Side 07/14/2024 8 AM 14 Good Hangar Fenceline - S Corner 07/14/2024 8 AM 15 Good Hangar Fenceline - S Side 07/14/2024 8 AM 17 Good Hangar Fenceline - SW Corner 07/14/2024 8 AM 16 Good Hangar Fenceline - SW Side 07/14/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/14/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 07/14/2024 8 AM 15 Good Moffett and Tustin Ranch 07/14/2024 8 AM 19 Good Valencia and Armstrong 07/14/2024 8 AM 15 Good Valencia and Columbus Square 07/14/2024 8 AM 13 Good Valencia and Legacy 07/14/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 07/14/2024 8 AM 19 Good Warner and Armstrong 07/14/2024 8 AM 18 Good Warner Avenue 07/14/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, July, 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/15/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 07/15/2024 8 AM 14 Good Hangar Fenceline - N Center 07/15/2024 8 AM 17 Good Hangar Fenceline - N Corner 07/15/2024 8 AM 15 Good Hangar Fenceline - NE Corner 07/15/2024 8 AM 15 Good Hangar Fenceline - NE Side 07/15/2024 8 AM 14 Good Hangar Fenceline - S Corner 07/15/2024 8 AM 16 Good Hangar Fenceline - S Side 07/15/2024 8 AM 18 Good Hangar Fenceline - SW Corner 07/15/2024 8 AM 17 Good Hangar Fenceline - SW Side 07/15/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/15/2024 8 AM Particulate Matter • 15 Level of Concern Good Legacy Road 07/15/2024 8 AM 15 Good Moffett and Tustin Ranch 07/15/2024 8 AM 21 Good Valencia and Armstrong 07/15/2024 8 AM 15 Good Valencia and Columbus Square 07/15/2024 8 AM 14 Good Valencia and Legacy 07/15/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 07/15/2024 8 AM 10 Good Warner and Armstrong 07/15/2024 8 AM 19 Good Warner Avenue 07/15/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, July, 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/16/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 07/16/2024 8 AM 12 Good Hangar Fenceline - N Center 07/16/2024 8 AM 17 Good Hangar Fenceline - N Corner 07/16/2024 8 AM 14 Good Hangar Fenceline - NE Corner 07/16/2024 8 AM 14 Good Hangar Fenceline - NE Side 07/16/2024 8 AM 13 Good Hangar Fenceline - S Corner 07/16/2024 8 AM 14 Good Hangar Fenceline - S Side 07/16/2024 8 AM 16 Good Hangar Fenceline - SW Corner 07/16/2024 8 AM 16 Good Hangar Fenceline - SW Side 07/16/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/16/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 07/16/2024 8 AM 14 Good Moffett and Tustin Ranch 07/16/2024 8 AM 21 Good Valencia and Armstrong 07/16/2024 8 AM 14 Good Valencia and Columbus Square 07/16/2024 8 AM 13 Good Valencia and Legacy 07/16/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 07/16/2024 8 AM 11 Good Warner and Armstrong 07/16/2024 8 AM 18 Good Warner Avenue 07/16/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, July, 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/17/2024 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 07/17/2024 8 AM 8 Good Hangar Fenceline - N Center 07/17/2024 8 AM 16 Good Hangar Fenceline - N Corner 07/17/2024 8 AM 11 Good Hangar Fenceline - NE Corner 07/17/2024 8 AM 11 Good Hangar Fenceline - NE Side 07/17/2024 8 AM 16 Good Hangar Fenceline - S Corner 07/17/2024 8 AM 11 Good Hangar Fenceline - S Side 07/17/2024 8 AM 13 Good Hangar Fenceline - SW Corner 07/17/2024 8 AM 11 Good Hangar Fenceline - SW Side 07/17/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/17/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 07/17/2024 8 AM 11 Good Moffett and Tustin Ranch 07/17/2024 8 AM 17 Good Valencia and Armstrong 07/17/2024 8 AM 11 Good Valencia and Columbus Square 07/17/2024 8 AM 10 Good Valencia and Legacy 07/17/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 07/17/2024 8 AM 10 Good Warner and Armstrong 07/17/2024 8 AM 14 Good Warner Avenue 07/17/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, July, 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/18/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 07/18/2024 8 AM 7 Good Hangar Fenceline - N Center 07/18/2024 8 AM 13 Good Hangar Fenceline - N Corner 07/18/2024 8 AM 11 Good Hangar Fenceline - NE Corner 07/18/2024 8 AM 11 Good Hangar Fenceline - NE Side 07/18/2024 8 AM 11 Good Hangar Fenceline - S Corner 07/18/2024 8 AM 12 Good Hangar Fenceline - S Side 07/18/2024 8 AM 13 Good Hangar Fenceline - SW Corner 07/18/2024 8 AM 13 Good Hangar Fenceline - SW Side 07/18/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/18/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 07/18/2024 8 AM 10 Good Moffett and Tustin Ranch 07/18/2024 8 AM 20 Good Valencia and Armstrong 07/18/2024 8 AM 10 Good Valencia and Columbus Square 07/18/2024 8 AM 9 Good Valencia and Legacy 07/18/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 07/18/2024 8 AM 10 Good Warner and Armstrong 07/18/2024 8 AM 11 Good Warner Avenue 07/18/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, July, 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/19/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 07/19/2024 8 AM 11 Good Hangar Fenceline - N Center 07/19/2024 8 AM 15 Good Hangar Fenceline - N Corner 07/19/2024 8 AM 14 Good Hangar Fenceline - NE Corner 07/19/2024 8 AM 14 Good Hangar Fenceline - NE Side 07/19/2024 8 AM 15 Good Hangar Fenceline - S Corner 07/19/2024 8 AM 14 Good Hangar Fenceline - S Side 07/19/2024 8 AM 15 Good Hangar Fenceline - SW Corner 07/19/2024 8 AM 15 Good Hangar Fenceline - SW Side 07/19/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/19/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 07/19/2024 8 AM 19 Good Moffett and Tustin Ranch 07/19/2024 8 AM 20 Good Valencia and Armstrong 07/19/2024 8 AM 13 Good Valencia and Columbus Square 07/19/2024 8 AM 13 Good Valencia and Legacy 07/19/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 07/19/2024 8 AM 12 Good Warner and Armstrong 07/19/2024 8 AM ** ** Warner Avenue 07/19/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, July, 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/20/2024 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 07/20/2024 8 AM 17 Good Hangar Fenceline - N Center 07/20/2024 8 AM 2S Good Hangar Fenceline - N Corner 07/20/2024 8 AM 23 Good Hangar Fenceline - NE Corner 07/20/2024 8 AM 23 Good Hangar Fenceline - NE Side 07/20/2024 8 AM 24 Good Hangar Fenceline - S Corner 07/20/2024 8 AM 23 Good Hangar Fenceline - S Side 07/20/2024 8 AM 24 Good Hangar Fenceline - SW Corner 07/20/2024 8 AM 23 Good Hangar Fenceline - SW Side 07/20/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/20/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 07/20/2024 8 AM 22 Good Moffett and Tustin Ranch 07/20/2024 8 AM 29 Good Valencia and Armstrong 07/20/2024 8 AM 22 Good Valencia and Columbus Square 07/20/2024 8 AM 20 Good Valencia and Legacy 07/20/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 07/20/2024 8 AM 22 Good Warner and Armstrong 07/20/2024 8 AM 23 Good Warner Avenue 07/20/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, July, 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/21/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 07/21/2024 8 AM 13 Good Hangar Fenceline - N Center 07/21/2024 8 AM 19 Good Hangar Fenceline - N Corner 07/21/2024 8 AM 19 Good Hangar Fenceline - NE Corner 07/21/2024 8 AM 18 Good Hangar Fenceline - NE Side 07/21/2024 8 AM 20 Good Hangar Fenceline - S Corner 07/21/2024 8 AM 19 Good Hangar Fenceline - S Side 07/21/2024 8 AM 21 Good Hangar Fenceline - SW Corner 07/21/2024 8 AM 21 Good Hangar Fenceline - SW Side 07/21/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/21/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 07/21/2024 8 AM 21 Good Moffett and Tustin Ranch 07/21/2024 8 AM 27 Good Valencia and Armstrong 07/21/2024 8 AM 17 Good Valencia and Columbus Square 07/21/2024 8 AM 16 Good Valencia and Legacy 07/21/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 07/21/2024 8 AM 18 Good Warner and Armstrong 07/21/2024 8 AM 27 Good Warner Avenue 07/21/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, July, 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/22/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 07/22/2024 8 AM 10 Good Hangar Fenceline - N Center 07/22/2024 8 AM 16 Good Hangar Fenceline - N Corner 07/22/2024 8 AM 17 Good Hangar Fenceline - NE Corner 07/22/2024 8 AM 15 Good Hangar Fenceline - NE Side 07/22/2024 8 AM 19 Good Hangar Fenceline - S Corner 07/22/2024 8 AM 17 Good Hangar Fenceline - S Side 07/22/2024 8 AM 19 Good Hangar Fenceline - SW Corner 07/22/2024 8 AM 18 Good Hangar Fenceline - SW Side 07/22/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/22/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 07/22/2024 8 AM 19 Good Moffett and Tustin Ranch 07/22/2024 8 AM 28 Good Valencia and Armstrong 07/22/2024 8 AM 15 Good Valencia and Columbus Square 07/22/2024 8 AM 14 Good Valencia and Legacy 07/22/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 07/22/2024 8 AM 16 Good Warner and Armstrong 07/22/2024 8 AM 12 Good Warner Avenue 07/22/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, July, 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/23/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 07/23/2024 8 AM 9 Good Hangar Fenceline - N Center 07/23/2024 8 AM 14 Good Hangar Fenceline - N Corner 07/23/2024 8 AM 14 Good Hangar Fenceline - NE Corner 07/23/2024 8 AM 13 Good Hangar Fenceline - NE Side 07/23/2024 8 AM 17 Good Hangar Fenceline - S Corner 07/23/2024 8 AM 15 Good Hangar Fenceline - S Side 07/23/2024 8 AM 15 Good Hangar Fenceline - SW Corner 07/23/2024 8 AM 16 Good Hangar Fenceline - SW Side 07/23/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/23/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 07/23/2024 8 AM 15 Good Moffett and Tustin Ranch 07/23/2024 8 AM 22 Good Valencia and Armstrong 07/23/2024 8 AM 14 Good Valencia and Columbus Square 07/23/2024 8 AM 13 Good Valencia and Legacy 07/23/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 07/23/2024 8 AM 13 Good Warner and Armstrong 07/23/2024 8 AM 13 Good Warner Avenue 07/23/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, July, 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/24/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 07/24/2024 8 AM 15 Good Hangar Fenceline - N Center 07/24/2024 8 AM 11 Good Hangar Fenceline - N Corner 07/24/2024 8 AM 12 Good Hangar Fenceline - NE Corner 07/24/2024 8 AM 14 Good Hangar Fenceline - NE Side 07/24/2024 8 AM 15 Good Hangar Fenceline - S Corner 07/24/2024 8 AM 13 Good Hangar Fenceline - S Side 07/24/2024 8 AM 14 Good Hangar Fenceline - SW Corner 07/24/2024 8 AM 13 Good Hangar Fenceline - SW Side 07/24/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/24/2024 8 AM Particulate Matter • 13 Level of Concern Good Legacy Road 07/24/2024 8 AM 12 Good Moffett and Tustin Ranch 07/24/2024 8 AM 19 Good Valencia and Armstrong 07/24/2024 8 AM 12 Good Valencia and Columbus Square 07/24/2024 8 AM 11 Good Valencia and Legacy 07/24/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 07/24/2024 8 AM 12 Good Warner and Armstrong 07/24/2024 8 AM 18 Good Warner Avenue 07/24/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, July, 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/25/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 07/25/2024 8 AM 10 Good Hangar Fenceline - N Center 07/25/2024 8 AM 19 Good Hangar Fenceline - N Corner 07/25/2024 8 AM 19 Good Hangar Fenceline - NE Corner 07/25/2024 8 AM 20 Good Hangar Fenceline - NE Side 07/25/2024 8 AM 23 Good Hangar Fenceline - S Corner 07/25/2024 8 AM 19 Good Hangar Fenceline - S Side 07/25/2024 8 AM 18 Good Hangar Fenceline - SW Corner 07/25/2024 8 AM 21 Good Hangar Fenceline - SW Side 07/25/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/25/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 07/25/2024 8 AM 18 Good Moffett and Tustin Ranch 07/25/2024 8 AM 29 Good Valencia and Armstrong 07/25/2024 8 AM 16 Good Valencia and Columbus Square 07/25/2024 8 AM 15 Good Valencia and Legacy 07/25/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 07/25/2024 8 AM 18 Good Warner and Armstrong 07/25/2024 8 AM 24 Good Warner Avenue 07/25/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, July, 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/26/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 07/26/2024 8 AM 10 Good Hangar Fenceline - N Center 07/26/2024 8 AM 17 Good Hangar Fenceline - N Corner 07/26/2024 8 AM 18 Good Hangar Fenceline - NE Corner 07/26/2024 8 AM 17 Good Hangar Fenceline - NE Side 07/26/2024 8 AM 20 Good Hangar Fenceline - S Corner 07/26/2024 8 AM 17 Good Hangar Fenceline - S Side 07/26/2024 8 AM 18 Good Hangar Fenceline - SW Corner 07/26/2024 8 AM 20 Good Hangar Fenceline - SW Side 07/26/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/26/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 07/26/2024 8 AM 18 Good Moffett and Tustin Ranch 07/26/2024 8 AM 26 Good Valencia and Armstrong 07/26/2024 8 AM 15 Good Valencia and Columbus Square 07/26/2024 8 AM 15 Good Valencia and Legacy 07/26/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 07/26/2024 8 AM 8 Good Warner and Armstrong 07/26/2024 8 AM 20 Good Warner Avenue 07/26/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, July, 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/27/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 07/27/2024 8 AM 13 Good Hangar Fenceline - N Center 07/27/2024 8 AM 16 Good Hangar Fenceline - N Corner 07/27/2024 8 AM 18 Good Hangar Fenceline - NE Corner 07/27/2024 8 AM 19 Good Hangar Fenceline - NE Side 07/27/2024 8 AM 20 Good Hangar Fenceline - S Corner 07/27/2024 8 AM 17 Good Hangar Fenceline - S Side 07/27/2024 8 AM 18 Good Hangar Fenceline - SW Corner 07/27/2024 8 AM 20 Good Hangar Fenceline - SW Side 07/27/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/27/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 07/27/2024 8 AM 20 Good Moffett and Tustin Ranch 07/27/2024 8 AM 26 Good Valencia and Armstrong 07/27/2024 8 AM 17 Good Valencia and Columbus Square 07/27/2024 8 AM 16 Good Valencia and Legacy 07/27/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 07/27/2024 8 AM 17 Good Warner and Armstrong 07/27/2024 8 AM 17 Good Warner Avenue 07/27/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, July, 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/28/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 07/28/2024 8 AM 11 Good Hangar Fenceline - N Center 07/28/2024 8 AM 21 Good Hangar Fenceline - N Corner 07/28/2024 8 AM 20 Good Hangar Fenceline - NE Corner 07/28/2024 8 AM 21 Good Hangar Fenceline - NE Side 07/28/2024 8 AM 21 Good Hangar Fenceline - S Corner 07/28/2024 8 AM 20 Good Hangar Fenceline - S Side 07/28/2024 8 AM 21 Good Hangar Fenceline - SW Corner 07/28/2024 8 AM 22 Good Hangar Fenceline - SW Side 07/28/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/28/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 07/28/2024 8 AM 19 Good Moffett and Tustin Ranch 07/28/2024 8 AM 29 Good Valencia and Armstrong 07/28/2024 8 AM 19 Good Valencia and Columbus Square 07/28/2024 8 AM 16 Good Valencia and Legacy 07/28/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 07/28/2024 8 AM 18 Good Warner and Armstrong 07/28/2024 8 AM 16 Good Warner Avenue 07/28/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, July, 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/29/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 07/29/2024 8 AM 13 Good Hangar Fenceline - N Center 07/29/2024 8 AM 13 Good Hangar Fenceline - N Corner 07/29/2024 8 AM 13 Good Hangar Fenceline - NE Corner 07/29/2024 8 AM 13 Good Hangar Fenceline - NE Side 07/29/2024 8 AM 15 Good Hangar Fenceline - S Corner 07/29/2024 8 AM 13 Good Hangar Fenceline - S Side 07/29/2024 8 AM 14 Good Hangar Fenceline - SW Corner 07/29/2024 8 AM 15 Good Hangar Fenceline - SW Side 07/29/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/29/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 07/29/2024 8 AM 12 Good Moffett and Tustin Ranch 07/29/2024 8 AM 23 Good Valencia and Armstrong 07/29/2024 8 AM 12 Good Valencia and Columbus Square 07/29/2024 8 AM 13 Good Valencia and Legacy 07/29/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 07/29/2024 8 AM 13 Good Warner and Armstrong 07/29/2024 8 AM 11 Good Warner Avenue 07/29/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, July, 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/30/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 07/30/2024 8 AM 12 Good Hangar Fenceline - N Center 07/30/2024 8 AM 16 Good Hangar Fenceline - N Corner 07/30/2024 8 AM 16 Good Hangar Fenceline - NE Corner 07/30/2024 8 AM 15 Good Hangar Fenceline - NE Side 07/30/2024 8 AM 16 Good Hangar Fenceline - S Corner 07/30/2024 8 AM 17 Good Hangar Fenceline - S Side 07/30/2024 8 AM 17 Good Hangar Fenceline - SW Corner 07/30/2024 8 AM 18 Good Hangar Fenceline - SW Side 07/30/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/30/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 07/30/2024 8 AM 15 Good Moffett and Tustin Ranch 07/30/2024 8 AM 21 Good Valencia and Armstrong 07/30/2024 8 AM 14 Good Valencia and Columbus Square 07/30/2024 8 AM 14 Good Valencia and Legacy 07/30/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 07/30/2024 8 AM 15 Good Warner and Armstrong 07/30/2024 8 AM 13 Good Warner Avenue 07/30/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, July, 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 07/31/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 07/31/2024 8 AM 8 Good Hangar Fenceline - N Center 07/31/2024 8 AM 17 Good Hangar Fenceline - N Corner 07/31/2024 8 AM 17 Good Hangar Fenceline - NE Corner 07/31/2024 8 AM 18 Good Hangar Fenceline - NE Side 07/31/2024 8 AM 17 Good Hangar Fenceline - S Corner 07/31/2024 8 AM 17 Good Hangar Fenceline - S Side 07/31/2024 8 AM 18 Good Hangar Fenceline - SW Corner 07/31/2024 8 AM 19 Good Hangar Fenceline - SW Side 07/31/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 07/31/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 07/31/2024 8 AM 15 Good Moffett and Tustin Ranch 07/31/2024 8 AM 23 Good Valencia and Armstrong 07/31/2024 8 AM 16 Good Valencia and Columbus Square 07/31/2024 8 AM 14 Good Valencia and Legacy 07/31/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 07/31/2024 8 AM 18 Good Warner and Armstrong 07/31/2024 8 AM 16 Good Warner Avenue 07/31/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, August, 01, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/01/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 08/01/2024 8 AM 8 Good Hangar Fenceline - N Center 08/01/2024 8 AM 19 Good Hangar Fenceline - N Corner 08/01/2024 8 AM 17 Good Hangar Fenceline - NE Corner 08/01/2024 8 AM 17 Good Hangar Fenceline - NE Side 08/01/2024 8 AM 17 Good Hangar Fenceline - S Corner 08/01/2024 8 AM 17 Good Hangar Fenceline - S Side 08/01/2024 8 AM 19 Good Hangar Fenceline - SW Corner 08/01/2024 8 AM 18 Good Hangar Fenceline - SW Side 08/01/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/01/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 08/01/2024 8 AM 16 Good Moffett and Tustin Ranch 08/01/2024 8 AM 23 Good Valencia and Armstrong 08/01/2024 8 AM 16 Good Valencia and Columbus Square 08/01/2024 8 AM 15 Good Valencia and Legacy 08/01/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 08/01/2024 8 AM 18 Good Warner and Armstrong 08/01/2024 8 AM 32 Good Warner Avenue -7 08/01/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, August, 02, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/02/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 08/02/2024 8 AM 9 Good Hangar Fenceline - N Center 08/02/2024 8 AM 19 Good Hangar Fenceline - N Corner 08/02/2024 8 AM 17 Good Hangar Fenceline - NE Corner 08/02/2024 8 AM 17 Good Hangar Fenceline - NE Side 08/02/2024 8 AM 18 Good Hangar Fenceline - S Corner 08/02/2024 8 AM 17 Good Hangar Fenceline - S Side 08/02/2024 8 AM 19 Good Hangar Fenceline - SW Corner 08/02/2024 8 AM 19 Good Hangar Fenceline - SW Side 08/02/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/02/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 08/02/2024 8 AM 16 Good Moffett and Tustin Ranch 08/02/2024 8 AM 22 Good Valencia and Armstrong 08/02/2024 8 AM 17 Good Valencia and Columbus Square 08/02/2024 8 AM 15 Good Valencia and Legacy 08/02/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 08/02/2024 8 AM 17 Good Warner and Armstrong 08/02/2024 8 AM 18 Good Warner Avenue 08/02/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, August, 03, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/03/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 08/03/2024 8 AM 8 Good Hangar Fenceline - N Center 08/03/2024 8 AM 16 Good Hangar Fenceline - N Corner 08/03/2024 8 AM 16 Good Hangar Fenceline - NE Corner 08/03/2024 8 AM 15 Good Hangar Fenceline - NE Side 08/03/2024 8 AM 16 Good Hangar Fenceline - S Corner 08/03/2024 8 AM 16 Good Hangar Fenceline - S Side 08/03/2024 8 AM 16 Good Hangar Fenceline - SW Corner 08/03/2024 8 AM 18 Good Hangar Fenceline - SW Side 08/03/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/03/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 08/03/2024 8 AM 14 Good Moffett and Tustin Ranch 08/03/2024 8 AM 23 Good Valencia and Armstrong 08/03/2024 8 AM 14 Good Valencia and Columbus Square 08/03/2024 8 AM 13 Good Valencia and Legacy 08/03/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 08/03/2024 8 AM 14 Good Warner and Armstrong 08/03/2024 8 AM 19 Good Warner Avenue -7 08/03/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, August, 04, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/04/2024 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 08/04/2024 8 AM 7 Good Hangar Fenceline - N Center 08/04/2024 8 AM 13 Good Hangar Fenceline - N Corner 08/04/2024 8 AM 13 Good Hangar Fenceline - NE Corner 08/04/2024 8 AM 11 Good Hangar Fenceline - NE Side 08/04/2024 8 AM 15 Good Hangar Fenceline - S Corner 08/04/2024 8 AM 13 Good Hangar Fenceline - S Side 08/04/2024 8 AM 14 Good Hangar Fenceline - SW Corner 08/04/2024 8 AM 14 Good Hangar Fenceline - SW Side 08/04/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/04/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 08/04/2024 8 AM 14 Good Moffett and Tustin Ranch 08/04/2024 8 AM 20 Good Valencia and Armstrong 08/04/2024 8 AM 11 Good Valencia and Columbus Square 08/04/2024 8 AM 11 Good Valencia and Legacy 08/04/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 08/04/2024 8 AM 12 Good Warner and Armstrong 08/04/2024 8 AM 12 Good Warner Avenue -7 08/04/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, August, 05, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/05/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 08/05/2024 8 AM 7 Good Hangar Fenceline - N Center 08/05/2024 8 AM 14 Good Hangar Fenceline - N Corner 08/05/2024 8 AM 14 Good Hangar Fenceline - NE Corner 08/05/2024 8 AM 14 Good Hangar Fenceline - NE Side 08/05/2024 8 AM 16 Good Hangar Fenceline - S Corner 08/05/2024 8 AM 13 Good Hangar Fenceline - S Side 08/05/2024 8 AM 15 Good Hangar Fenceline - SW Corner 08/05/2024 8 AM 15 Good Hangar Fenceline - SW Side 08/05/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/05/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 08/05/2024 8 AM 13 Good Moffett and Tustin Ranch 08/05/2024 8 AM 20 Good Valencia and Armstrong 08/05/2024 8 AM 12 Good Valencia and Columbus Square 08/05/2024 8 AM 12 Good Valencia and Legacy 08/05/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 08/05/2024 8 AM 14 Good Warner and Armstrong 08/05/2024 8 AM 14 Good Warner Avenue -7 08/05/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, August, 06, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/06/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 08/06/2024 8 AM 17 Good Hangar Fenceline - N Center 08/06/2024 8 AM 16 Good Hangar Fenceline - N Corner 08/06/2024 8 AM 17 Good Hangar Fenceline - NE Corner 08/06/2024 8 AM 17 Good Hangar Fenceline - NE Side 08/06/2024 8 AM 20 Good Hangar Fenceline - S Corner 08/06/2024 8 AM 17 Good Hangar Fenceline - S Side 08/06/2024 8 AM 19 Good Hangar Fenceline - SW Corner 08/06/2024 8 AM 18 Good Hangar Fenceline - SW Side 08/06/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/06/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 08/06/2024 8 AM 15 Good Moffett and Tustin Ranch 08/06/2024 8 AM 24 Good Valencia and Armstrong 08/06/2024 8 AM 15 Good Valencia and Columbus Square 08/06/2024 8 AM 16 Good Valencia and Legacy 08/06/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 08/06/2024 8 AM 16 Good Warner and Armstrong 08/06/2024 8 AM 18 Good Warner Avenue -7 08/06/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, August, 07, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/07/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 08/07/2024 8 AM 8 Good Hangar Fenceline - N Center 08/07/2024 8 AM 19 Good Hangar Fenceline - N Corner 08/07/2024 8 AM 20 Good Hangar Fenceline - NE Corner 08/07/2024 8 AM 20 Good Hangar Fenceline - NE Side 08/07/2024 8 AM 23 Good Hangar Fenceline - S Corner 08/07/2024 8 AM 19 Good Hangar Fenceline - S Side 08/07/2024 8 AM 20 Good Hangar Fenceline - SW Corner 08/07/2024 8 AM 21 Good Hangar Fenceline - SW Side 08/07/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/07/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 08/07/2024 8 AM 19 Good Moffett and Tustin Ranch 08/07/2024 8 AM 28 Good Valencia and Armstrong 08/07/2024 8 AM 18 Good Valencia and Columbus Square 08/07/2024 8 AM 17 Good Valencia and Legacy 08/07/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 08/07/2024 8 AM 20 Good Warner and Armstrong 08/07/2024 8 AM 19 Good Warner Avenue 08/07/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, August, 08, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/08/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 08/08/2024 8 AM 8 Good Hangar Fenceline - N Center 08/08/2024 8 AM 20 Good Hangar Fenceline - N Corner 08/08/2024 8 AM 20 Good Hangar Fenceline - NE Corner 08/08/2024 8 AM 21 Good Hangar Fenceline - NE Side 08/08/2024 8 AM 23 Good Hangar Fenceline - S Corner 08/08/2024 8 AM 20 Good Hangar Fenceline - S Side 08/08/2024 8 AM 20 Good Hangar Fenceline - SW Corner 08/08/2024 8 AM 21 Good Hangar Fenceline - SW Side 08/08/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/08/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 08/08/2024 8 AM 28 Good Moffett and Tustin Ranch 08/08/2024 8 AM 26 Good Valencia and Armstrong 08/08/2024 8 AM 19 Good Valencia and Columbus Square 08/08/2024 8 AM 18 Good Valencia and Legacy 08/08/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 08/08/2024 8 AM 23 Good Warner and Armstrong 08/08/2024 8 AM 8 Good Warner Avenue -7 08/08/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, August, 09, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy (355 to 424) Location Columbus Square Park Period Ending 08/09/2024 8 AM • 13 Good Hangar Fenceline - E Side 08/09/2024 8 AM 19 Good Hangar Fenceline - N Center 08/09/2024 8 AM 15 Good Hangar Fenceline - N Corner 08/09/2024 8 AM 15 Good Hangar Fenceline - NE Corner 08/09/2024 8 AM 16 Good Hangar Fenceline - NE Side 08/09/2024 8 AM 18 Good Hangar Fenceline - S Corner 08/09/2024 8 AM 16 Good Hangar Fenceline - S Side 08/09/2024 8 AM 17 Good Hangar Fenceline - SW Corner 08/09/2024 8 AM 17 Good Hangar Fenceline - SW Side 08/09/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period Ending 08/09/2024 8 AM Particulate Matter 16 Level of Concern Good Legacy Road 08/09/2024 8 AM 20 Good Moffett and Tustin Ranch 08/09/2024 8 AM 23 Good Valencia and Armstrong 08/09/2024 8 AM 15 Good Valencia and Columbus Square 08/09/2024 8 AM 14 Good Valencia and Legacy 08/09/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 08/09/2024 8 AM 17 Good Warner and Armstrong 08/09/2024 8 AM 10 Good Warner Avenue 08/09/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous04 Health warning of emergencyconditions: more ever• - is likely • be affected. Saturday, August, 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/10/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 08/10/2024 8 AM 19 Good Hangar Fenceline - N Center 08/10/2024 8 AM 19 Good Hangar Fenceline - N Corner 08/10/2024 8 AM 18 Good Hangar Fenceline - NE Corner 08/10/2024 8 AM 16 Good Hangar Fenceline - NE Side 08/10/2024 8 AM 20 Good Hangar Fenceline - S Corner 08/10/2024 8 AM 17 Good Hangar Fenceline - S Side 08/10/2024 8 AM 19 Good Hangar Fenceline - SW Corner 08/10/2024 8 AM 19 Good Hangar Fenceline - SW Side 08/10/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/10/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 08/10/2024 8 AM 21 Good Moffett and Tustin Ranch 08/10/2024 8 AM 24 Good Valencia and Armstrong 08/10/2024 8 AM 18 Good Valencia and Columbus Square 08/10/2024 8 AM 17 Good Valencia and Legacy 08/10/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 08/10/2024 8 AM 18 Good Warner and Armstrong 08/10/2024 8 AM 6 Good Warner Avenue -7 08/10/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, August, 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/11/2024 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 08/11/2024 8 AM 25 Good Hangar Fenceline - N Center 08/11/2024 8 AM 24 Good Hangar Fenceline - N Corner 08/11/2024 8 AM 23 Good Hangar Fenceline - NE Corner 08/11/2024 8 AM 22 Good Hangar Fenceline - NE Side 08/11/2024 8 AM 25 Good Hangar Fenceline - S Corner 08/11/2024 8 AM 23 Good Hangar Fenceline - S Side 08/11/2024 8 AM 23 Good Hangar Fenceline - SW Corner 08/11/2024 8 AM 23 Good Hangar Fenceline - SW Side 08/11/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/11/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 08/11/2024 8 AM 25 Good Moffett and Tustin Ranch 08/11/2024 8 AM 30 Good Valencia and Armstrong 08/11/2024 8 AM 22 Good Valencia and Columbus Square 08/11/2024 8 AM 20 Good Valencia and Legacy 08/11/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 08/11/2024 8 AM 13 Good Warner and Armstrong 08/11/2024 8 AM 9 Good Warner Avenue 08/11/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, August, 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/12/2024 8 AM Matter 22 Level of Concern Good Hangar Fenceline - E Side 08/12/2024 8 AM 29 Good Hangar Fenceline - N Center 08/12/2024 8 AM 2S Good Hangar Fenceline - N Corner 08/12/2024 8 AM 26 Good Hangar Fenceline - NE Corner 08/12/2024 8 AM 27 Good Hangar Fenceline - NE Side 08/12/2024 8 AM 28 Good Hangar Fenceline - S Corner 08/12/2024 8 AM 26 Good Hangar Fenceline - S Side 08/12/2024 8 AM 2S Good Hangar Fenceline - SW Corner 08/12/2024 8 AM 26 Good Hangar Fenceline - SW Side 08/12/2024 8 AM 29 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/12/2024 8 AM Particulate Matter • 24 Level of Concern Good Legacy Road 08/12/2024 8 AM 29 Good Moffett and Tustin Ranch 08/12/2024 8 AM 34 Good Valencia and Armstrong 08/12/2024 8 AM 25 Good Valencia and Columbus Square 08/12/2024 8 AM 23 Good Valencia and Legacy 08/12/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 08/12/2024 8 AM 25 Good Warner and Armstrong 08/12/2024 8 AM 15 Good Warner Avenue -7 08/12/2024 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, August, 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/13/2024 8 AM Matter 18 Level of Concern Good Hangar Fenceline - E Side 08/13/2024 8 AM 21 Good Hangar Fenceline - N Center 08/13/2024 8 AM 21 Good Hangar Fenceline - N Corner 08/13/2024 8 AM 21 Good Hangar Fenceline - NE Corner 08/13/2024 8 AM 21 Good Hangar Fenceline - NE Side 08/13/2024 8 AM 23 Good Hangar Fenceline - S Corner 08/13/2024 8 AM 21 Good Hangar Fenceline - S Side 08/13/2024 8 AM 21 Good Hangar Fenceline - SW Corner 08/13/2024 8 AM 22 Good Hangar Fenceline - SW Side 08/13/2024 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/13/2024 8 AM Particulate Matter • 21 Level of Concern Good Legacy Road 08/13/2024 8 AM 24 Good Moffett and Tustin Ranch 08/13/2024 8 AM 27 Good Valencia and Armstrong 08/13/2024 8 AM 21 Good Valencia and Columbus Square 08/13/2024 8 AM 20 Good Valencia and Legacy 08/13/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 08/13/2024 8 AM 22 Good Warner and Armstrong 08/13/2024 8 AM 10 Good Warner Avenue -7 08/13/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, August, 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/14/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 08/14/2024 8 AM 23 Good Hangar Fenceline - N Center 08/14/2024 8 AM 21 Good Hangar Fenceline - N Corner 08/14/2024 8 AM 22 Good Hangar Fenceline - NE Corner 08/14/2024 8 AM 21 Good Hangar Fenceline - NE Side 08/14/2024 8 AM 23 Good Hangar Fenceline - S Corner 08/14/2024 8 AM 21 Good Hangar Fenceline - S Side 08/14/2024 8 AM 21 Good Hangar Fenceline - SW Corner 08/14/2024 8 AM 23 Good Hangar Fenceline - SW Side 08/14/2024 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/14/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 08/14/2024 8 AM 24 Good Moffett and Tustin Ranch 08/14/2024 8 AM 30 Good Valencia and Armstrong 08/14/2024 8 AM 19 Good Valencia and Columbus Square 08/14/2024 8 AM 18 Good Valencia and Legacy 08/14/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 08/14/2024 8 AM 22 Good Warner and Armstrong 08/14/2024 8 AM 7 Good Warner Avenue 08/14/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, August, 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/15/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 08/15/2024 8 AM 22 Good Hangar Fenceline - N Center 08/15/2024 8 AM 20 Good Hangar Fenceline - N Corner 08/15/2024 8 AM 19 Good Hangar Fenceline - NE Corner 08/15/2024 8 AM 20 Good Hangar Fenceline - NE Side 08/15/2024 8 AM 22 Good Hangar Fenceline - S Corner 08/15/2024 8 AM 20 Good Hangar Fenceline - S Side 08/15/2024 8 AM 20 Good Hangar Fenceline - SW Corner 08/15/2024 8 AM 22 Good Hangar Fenceline - SW Side 08/15/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/15/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 08/15/2024 8 AM 22 Good Moffett and Tustin Ranch 08/15/2024 8 AM 25 Good Valencia and Armstrong 08/15/2024 8 AM 19 Good Valencia and Columbus Square 08/15/2024 8 AM 18 Good Valencia and Legacy 08/15/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 08/15/2024 8 AM 26 Good Warner and Armstrong 08/15/2024 8 AM 8 Good Warner Avenue -7 08/15/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, August, 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/16/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 08/16/2024 8 AM 17 Good Hangar Fenceline - N Center 08/16/2024 8 AM 17 Good Hangar Fenceline - N Corner 08/16/2024 8 AM 17 Good Hangar Fenceline - NE Corner 08/16/2024 8 AM 17 Good Hangar Fenceline - NE Side 08/16/2024 8 AM 18 Good Hangar Fenceline - S Corner 08/16/2024 8 AM 16 Good Hangar Fenceline - S Side 08/16/2024 8 AM 18 Good Hangar Fenceline - SW Corner 08/16/2024 8 AM 18 Good Hangar Fenceline - SW Side 08/16/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/16/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 08/16/2024 8 AM 18 Good Moffett and Tustin Ranch 08/16/2024 8 AM 19 Good Valencia and Armstrong 08/16/2024 8 AM 15 Good Valencia and Columbus Square 08/16/2024 8 AM 14 Good Valencia and Legacy 08/16/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 08/16/2024 8 AM 16 Good Warner and Armstrong 08/16/2024 8 AM 6 Good Warner Avenue -7 08/16/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, August, 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/17/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 08/17/2024 8 AM 17 Good Hangar Fenceline - N Center 08/17/2024 8 AM 18 Good Hangar Fenceline - N Corner 08/17/2024 8 AM 16 Good Hangar Fenceline - NE Corner 08/17/2024 8 AM 17 Good Hangar Fenceline - NE Side 08/17/2024 8 AM 19 Good Hangar Fenceline - S Corner 08/17/2024 8 AM 16 Good Hangar Fenceline - S Side 08/17/2024 8 AM 17 Good Hangar Fenceline - SW Corner 08/17/2024 8 AM 18 Good Hangar Fenceline - SW Side 08/17/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/17/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 08/17/2024 8 AM 20 Good Moffett and Tustin Ranch 08/17/2024 8 AM 22 Good Valencia and Armstrong 08/17/2024 8 AM 16 Good Valencia and Columbus Square 08/17/2024 8 AM 16 Good Valencia and Legacy 08/17/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 08/17/2024 8 AM 17 Good Warner and Armstrong 08/17/2024 8 AM 14 Good Warner Avenue 08/17/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, August, 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/18/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 08/18/2024 8 AM 16 Good Hangar Fenceline - N Center 08/18/2024 8 AM 16 Good Hangar Fenceline - N Corner 08/18/2024 8 AM 15 Good Hangar Fenceline - NE Corner 08/18/2024 8 AM 16 Good Hangar Fenceline - NE Side 08/18/2024 8 AM 19 Good Hangar Fenceline - S Corner 08/18/2024 8 AM 14 Good Hangar Fenceline - S Side 08/18/2024 8 AM 16 Good Hangar Fenceline - SW Corner 08/18/2024 8 AM 16 Good Hangar Fenceline - SW Side 08/18/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/18/2024 8 AM Particulate Matter • 15 Level of Concern Good Legacy Road 08/18/2024 8 AM 17 Good Moffett and Tustin Ranch 08/18/2024 8 AM 19 Good Valencia and Armstrong 08/18/2024 8 AM 15 Good Valencia and Columbus Square 08/18/2024 8 AM 14 Good Valencia and Legacy 08/18/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 08/18/2024 8 AM 14 Good Warner and Armstrong 08/18/2024 8 AM 16 Good Warner Avenue -7 08/18/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, August, 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/19/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 08/19/2024 8 AM 16 Good Hangar Fenceline - N Center 08/19/2024 8 AM 14 Good Hangar Fenceline - N Corner 08/19/2024 8 AM 15 Good Hangar Fenceline - NE Corner 08/19/2024 8 AM 15 Good Hangar Fenceline - NE Side 08/19/2024 8 AM 17 Good Hangar Fenceline - S Corner 08/19/2024 8 AM 14 Good Hangar Fenceline - S Side 08/19/2024 8 AM 15 Good Hangar Fenceline - SW Corner 08/19/2024 8 AM 16 Good Hangar Fenceline - SW Side 08/19/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/19/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 08/19/2024 8 AM 17 Good Moffett and Tustin Ranch 08/19/2024 8 AM 18 Good Valencia and Armstrong 08/19/2024 8 AM 13 Good Valencia and Columbus Square 08/19/2024 8 AM 12 Good Valencia and Legacy 08/19/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 08/19/2024 8 AM 13 Good Warner and Armstrong 08/19/2024 8 AM 23 Good Warner Avenue -7 08/19/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, August, 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/20/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 08/20/2024 8 AM 15 Good Hangar Fenceline - N Center 08/20/2024 8 AM 13 Good Hangar Fenceline - N Corner 08/20/2024 8 AM 13 Good Hangar Fenceline - NE Corner 08/20/2024 8 AM 12 Good Hangar Fenceline - NE Side 08/20/2024 8 AM 14 Good Hangar Fenceline - S Corner 08/20/2024 8 AM 11 Good Hangar Fenceline - S Side 08/20/2024 8 AM 13 Good Hangar Fenceline - SW Corner 08/20/2024 8 AM 15 Good Hangar Fenceline - SW Side 08/20/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/20/2024 8 AM Particulate Matter • 13 Level of Concern Good Legacy Road 08/20/2024 8 AM 14 Good Moffett and Tustin Ranch 08/20/2024 8 AM 18 Good Valencia and Armstrong 08/20/2024 8 AM 10 Good Valencia and Columbus Square 08/20/2024 8 AM 11 Good Valencia and Legacy 08/20/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 08/20/2024 8 AM 13 Good Warner and Armstrong 08/20/2024 8 AM 23 Good Warner Avenue -7 08/20/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, August 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/21/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 08/21/2024 8 AM 17 Good Hangar Fenceline - N Center 08/21/2024 8 AM 19 Good Hangar Fenceline - N Corner 08/21/2024 8 AM 14 Good Hangar Fenceline - NE Corner 08/21/2024 8 AM 18 Good Hangar Fenceline - NE Side 08/21/2024 8 AM 16 Good Hangar Fenceline - S Corner 08/21/2024 8 AM 18 Good Hangar Fenceline - S Side 08/21/2024 8 AM 18 Good Hangar Fenceline - SW Corner 08/21/2024 8 AM 22 Good Hangar Fenceline - SW Side 08/21/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/21/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 08/21/2024 8 AM 16 Good Moffett and Tustin Ranch 08/21/2024 8 AM 17 Good Valencia and Armstrong 08/21/2024 8 AM 16 Good Valencia and Columbus Square 08/21/2024 8 AM 22 Good Valencia and Legacy 08/21/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 08/21/2024 8 AM 17 Good Warner and Armstrong 08/21/2024 8 AM 34 Good Warner Avenue 08/21/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, August 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/22/2024 8 AM Matter 18 Level of Concern Good Hangar Fenceline - E Side 08/22/2024 8 AM 19 Good Hangar Fenceline - N Center 08/22/2024 8 AM 21 Good Hangar Fenceline - N Corner 08/22/2024 8 AM 11 Good Hangar Fenceline - NE Corner 08/22/2024 8 AM 22 Good Hangar Fenceline - NE Side 08/22/2024 8 AM 14 Good Hangar Fenceline - S Corner 08/22/2024 8 AM 19 Good Hangar Fenceline - S Side 08/22/2024 8 AM 20 Good Hangar Fenceline - SW Corner 08/22/2024 8 AM 23 Good Hangar Fenceline - SW Side 08/22/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/22/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 08/22/2024 8 AM 18 Good Moffett and Tustin Ranch 08/22/2024 8 AM 18 Good Valencia and Armstrong 08/22/2024 8 AM 19 Good Valencia and Columbus Square 08/22/2024 8 AM 20 Good Valencia and Legacy 08/22/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 08/22/2024 8 AM 19 Good Warner and Armstrong 08/22/2024 8 AM 15 Good Warner Avenue -7 08/22/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, August 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 08/23/2024 8 AM Particulate Matter 13 Level of Concern Good Hangar Fenceline - E Side 08/23/2024 8 AM 18 Good Hangar Fenceline - N Center 08/23/2024 8 AM 19 Good Hangar Fenceline - N Corner 08/23/2024 8 AM 11 Good Hangar Fenceline - NE Corner 08/23/2024 8 AM 19 Good Hangar Fenceline - NE Side 08/23/2024 8 AM 16 Good Hangar Fenceline - S Corner 08/23/2024 8 AM 18 Good Hangar Fenceline - S Side 08/23/2024 8 AM 18 Good Hangar Fenceline - SW Corner 08/23/2024 8 AM 20 Good Hangar Fenceline - SW Side 08/23/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/23/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 08/23/2024 8 AM 16 Good Moffett and Tustin Ranch 08/23/2024 8 AM 17 Good Valencia and Armstrong 08/23/2024 8 AM 16 Good Valencia and Columbus Square 08/23/2024 8 AM 21 Good Valencia and Legacy 08/23/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 08/23/2024 8 AM 16 Good Warner Avenue 08/23/2024 8 AM 15 Good Warner and Armstrong 08/23/2024 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, August 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 08/24/2024 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - E Side 08/24/2024 8 AM 15 Good Hangar Fenceline - N Center 08/24/2024 8 AM 16 Good Hangar Fenceline - N Corner 08/24/2024 8 AM 9 Good Hangar Fenceline - NE Corner 08/24/2024 8 AM 16 Good Hangar Fenceline - NE Side 08/24/2024 8 AM 11 Good Hangar Fenceline - S Corner 08/24/2024 8 AM 8 Good Hangar Fenceline - S Side 08/24/2024 8 AM 16 Good Hangar Fenceline - SW Corner 08/24/2024 8 AM 17 Good Hangar Fenceline - SW Side 08/24/2024 8 AM 12 Good Location Hangar Fenceline - W Side 24-Hour Period Ending 08/24/2024 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 08/24/2024 8 AM 15 Good Moffett and Tustin Ranch 08/24/2024 8 AM 15 Good Valencia and Armstrong 08/24/2024 8 AM 13 Good Valencia and Columbus Square 08/24/2024 8 AM 18 Good Valencia and Legacy 08/24/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 08/24/2024 8 AM 11 Good Warner Avenue 08/24/2024 8 AM 14 Good Warner and Armstrong 08/24/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely ..- affected. Sunday, August 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/25/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 08/25/2024 8 AM 19 Good Hangar Fenceline - N Center 08/25/2024 8 AM 20 Good Hangar Fenceline - N Corner 08/25/2024 8 AM 14 Good Hangar Fenceline - NE Corner 08/25/2024 8 AM 20 Good Hangar Fenceline - NE Side 08/25/2024 8 AM 15 Good Hangar Fenceline - S Corner 08/25/2024 8 AM 17 Good Hangar Fenceline - S Side 08/25/2024 8 AM 19 Good Hangar Fenceline - SW Corner 08/25/2024 8 AM 21 Good Hangar Fenceline - SW Side 08/25/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/25/2024 8 AM Particulate Matter • 9 Level of Concern Good Legacy Road 08/25/2024 8 AM 17 Good Moffett and Tustin Ranch 08/25/2024 8 AM 19 Good Valencia and Armstrong 08/25/2024 8 AM 18 Good Valencia and Columbus Square 08/25/2024 8 AM 22 Good Valencia and Legacy 08/25/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 08/25/2024 8 AM 15 Good Warner Avenue 08/25/2024 8 AM 17 Good Warner and Armstrong 08/25/2024 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, August 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/26/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 08/26/2024 8 AM 19 Good Hangar Fenceline - N Center 08/26/2024 8 AM 20 Good Hangar Fenceline - N Corner 08/26/2024 8 AM 12 Good Hangar Fenceline - NE Corner 08/26/2024 8 AM 21 Good Hangar Fenceline - NE Side 08/26/2024 8 AM 15 Good Hangar Fenceline - S Corner 08/26/2024 8 AM 20 Good Hangar Fenceline - S Side 08/26/2024 8 AM 20 Good Hangar Fenceline - SW Corner 08/26/2024 8 AM 22 Good Hangar Fenceline - SW Side 08/26/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/26/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 08/26/2024 8 AM 17 Good Moffett and Tustin Ranch 08/26/2024 8 AM 19 Good Valencia and Armstrong 08/26/2024 8 AM 17 Good Valencia and Columbus Square 08/26/2024 8 AM 24 Good Valencia and Legacy 08/26/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 08/26/2024 8 AM 15 Good Warner Avenue 08/26/2024 8 AM 18 Good Warner and Armstrong 08/26/2024 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, August 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/27/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 08/27/2024 8 AM 19 Good Hangar Fenceline - N Center 08/27/2024 8 AM 20 Good Hangar Fenceline - N Corner 08/27/2024 8 AM 13 Good Hangar Fenceline - NE Corner 08/27/2024 8 AM 22 Good Hangar Fenceline - NE Side 08/27/2024 8 AM 15 Good Hangar Fenceline - S Corner 08/27/2024 8 AM 18 Good Hangar Fenceline - S Side 08/27/2024 8 AM 19 Good Hangar Fenceline - SW Corner 08/27/2024 8 AM 23 Good Hangar Fenceline - SW Side 08/27/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/27/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 08/27/2024 8 AM 18 Good Moffett and Tustin Ranch 08/27/2024 8 AM 19 Good Valencia and Armstrong 08/27/2024 8 AM 17 Good Valencia and Columbus Square 08/27/2024 8 AM 25 Good Valencia and Legacy 08/27/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 08/27/2024 8 AM 15 Good Warner Avenue 08/27/2024 8 AM 18 Good Warner and Armstrong 08/27/2024 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, August 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/28/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 08/28/2024 8 AM 28 Good Hangar Fenceline - N Center 08/28/2024 8 AM 30 Good Hangar Fenceline - N Corner 08/28/2024 8 AM 21 Good Hangar Fenceline - NE Corner 08/28/2024 8 AM 33 Good Hangar Fenceline - NE Side 08/28/2024 8 AM 22 Good Hangar Fenceline - S Corner 08/28/2024 8 AM 30 Good Hangar Fenceline - S Side 08/28/2024 8 AM 27 Good Hangar Fenceline - SW Corner 08/28/2024 8 AM 33 Good Hangar Fenceline - SW Side 08/28/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/28/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 08/28/2024 8 AM 28 Good Moffett and Tustin Ranch 08/28/2024 8 AM 28 Good Valencia and Armstrong 08/28/2024 8 AM 24 Good Valencia and Columbus Square 08/28/2024 8 AM 32 Good Valencia and Legacy 08/28/2024 8 AM 28 Good Victory and Tustin Ranch Rd. 08/28/2024 8 AM 23 Good Warner Avenue 08/28/2024 8 AM ** ** Warner and Armstrong 08/28/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, August 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 08/29/2024 8 AM Particulate Matter 38 Level of Concern Good Hangar Fenceline - E Side 08/29/2024 8 AM 26 Good Hangar Fenceline - N Center 08/29/2024 8 AM 27 Good Hangar Fenceline - N Corner 08/29/2024 8 AM 20 Good Hangar Fenceline - NE Corner 08/29/2024 8 AM 31 Good Hangar Fenceline - NE Side 08/29/2024 8 AM 19 Good Hangar Fenceline - S Corner 08/29/2024 8 AM 27 Good Hangar Fenceline - S Side 08/29/2024 8 AM 2S Good Hangar Fenceline - SW Corner 08/29/2024 8 AM 29 Good Hangar Fenceline - SW Side 08/29/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/29/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 08/29/2024 8 AM 24 Good Moffett and Tustin Ranch 08/29/2024 8 AM 26 Good Valencia and Armstrong 08/29/2024 8 AM 23 Good Valencia and Columbus Square 08/29/2024 8 AM 29 Good Valencia and Legacy 08/29/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 08/29/2024 8 AM 21 Good Warner Avenue 08/29/2024 8 AM 22 Good Warner and Armstrong 08/29/2024 8 AM 32 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, August 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/30/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 08/30/2024 8 AM 32 Good Hangar Fenceline - N Center 08/30/2024 8 AM 33 Good Hangar Fenceline - N Corner 08/30/2024 8 AM 26 Good Hangar Fenceline - NE Corner 08/30/2024 8 AM 37 Good Hangar Fenceline - NE Side 08/30/2024 8 AM 26 Good Hangar Fenceline - S Corner 08/30/2024 8 AM ** ** Hangar Fenceline - S Side 08/30/2024 8 AM 32 Good Hangar Fenceline - SW Corner 08/30/2024 8 AM 3S Good Hangar Fenceline - SW Side 08/30/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/30/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 08/30/2024 8 AM 31 Good Moffett and Tustin Ranch 08/30/2024 8 AM 31 Good Valencia and Armstrong 08/30/2024 8 AM 27 Good Valencia and Columbus Square 08/30/2024 8 AM 34 Good Valencia and Legacy 08/30/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 08/30/2024 8 AM 26 Good Warner Avenue 08/30/2024 8 AM 27 Good Warner and Armstrong 08/30/2024 8 AM 34 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, August 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 08/31/2024 8 AM Matter 27 Level of Concern Good Hangar Fenceline - E Side 08/31/2024 8 AM ** ** Hangar Fenceline - N Center 08/31/2024 8 AM 34 Good Hangar Fenceline - N Corner 08/31/2024 8 AM 27 Good Hangar Fenceline - NE Corner 08/31/2024 8 AM 39 Good Hangar Fenceline - NE Side 08/31/2024 8 AM 25 Good Hangar Fenceline - S Corner 08/31/2024 8 AM 33 Good Hangar Fenceline - S Side 08/31/2024 8 AM 31 Good Hangar Fenceline - SW Corner 08/31/2024 8 AM 36 Good Hangar Fenceline - SW Side 08/31/2024 8 AM 28 Good • •24-Hour Hangar Fenceline - W Side Period • • 08/31/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 08/31/2024 8 AM 32 Good Moffett and Tustin Ranch 08/31/2024 8 AM 33 Good Valencia and Armstrong 08/31/2024 8 AM 28 Good Valencia and Columbus Square 08/31/2024 8 AM 36 Good Valencia and Legacy 08/31/2024 8 AM 32 Good Victory and Tustin Ranch Rd. 08/31/2024 8 AM 27 Good Warner Avenue 08/31/2024 8 AM 28 Good Warner and Armstrong 08/31/2024 8 AM 34 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, September 1, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/1/2024 8 AM Matter 21 Level of Concern Good Hangar Fenceline - E Side 09/1/2024 8 AM 30 Good Hangar Fenceline - N Center 09/1/2024 8 AM 31 Good Hangar Fenceline - N Corner 09/1/2024 8 AM 22 Good Hangar Fenceline - NE Corner 09/1/2024 8 AM 36 Good Hangar Fenceline - NE Side 09/1/2024 8 AM 24 Good Hangar Fenceline - S Corner 09/1/2024 8 AM ** ** Hangar Fenceline - S Side 09/1/2024 8 AM 29 Good Hangar Fenceline - SW Corner 09/1/2024 8 AM 34 Good Hangar Fenceline - SW Side 09/1/2024 8 AM 25 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/1/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 09/1/2024 8 AM 30 Good Moffett and Tustin Ranch 09/1/2024 8 AM 30 Good Valencia and Armstrong 09/1/2024 8 AM 25 Good Valencia and Columbus Square 09/1/2024 8 AM 35 Good Valencia and Legacy 09/1/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 09/1/2024 8 AM 24 Good Warner Avenue 09/1/2024 8 AM 27 Good Warner and Armstrong 09/1/2024 8 AM 32 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, September 2, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/2/2024 8 AM Particulate Matter 21 Level of Concern Good Hangar Fenceline - E Side 09/2/2024 8 AM 32 Good Hangar Fenceline - N Center 09/2/2024 8 AM 33 Good Hangar Fenceline - N Corner 09/2/2024 8 AM 24 Good Hangar Fenceline - NE Corner 09/2/2024 8 AM 37 Good Hangar Fenceline - NE Side 09/2/2024 8 AM 24 Good Hangar Fenceline - S Corner 09/2/2024 8 AM 27 Good Hangar Fenceline - S Side 09/2/2024 8 AM 30 Good Hangar Fenceline - SW Corner 09/2/2024 8 AM 36 Good Hangar Fenceline - SW Side 09/2/2024 8 AM 26 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/2/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 09/2/2024 8 AM 31 Good Moffett and Tustin Ranch 09/2/2024 8 AM 32 Good Valencia and Armstrong 09/2/2024 8 AM 27 Good Valencia and Columbus Square 09/2/2024 8 AM 37 Good Valencia and Legacy 09/2/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 09/2/2024 8 AM 25 Good Warner Avenue 09/2/2024 8 AM 28 Good Warner and Armstrong 09/2/2024 8 AM 36 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, September 3, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/3/2024 8 AM Particulate Matter 23 Level of Concern Good Hangar Fenceline - E Side 09/3/2024 8 AM 34 Good Hangar Fenceline - N Center 09/3/2024 8 AM 34 Good Hangar Fenceline - N Corner 09/3/2024 8 AM 24 Good Hangar Fenceline - NE Corner 09/3/2024 8 AM 36 Good Hangar Fenceline - NE Side 09/3/2024 8 AM 26 Good Hangar Fenceline - S Corner 09/3/2024 8 AM 29 Good Hangar Fenceline - S Side 09/3/2024 8 AM 31 Good Hangar Fenceline - SW Corner 09/3/2024 8 AM 37 Good Hangar Fenceline - SW Side 09/3/2024 8 AM 29 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/3/2024 8 AM Particulate Matter • 19 Level of Concern Good Legacy Road 09/3/2024 8 AM 30 Good Moffett and Tustin Ranch 09/3/2024 8 AM 33 Good Valencia and Armstrong 09/3/2024 8 AM 28 Good Valencia and Columbus Square 09/3/2024 8 AM 38 Good Valencia and Legacy 09/3/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 09/3/2024 8 AM 27 Good Warner Avenue 09/3/2024 8 AM 30 Good Warner and Armstrong 09/3/2024 8 AM 36 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, September 4, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/4/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 09/4/2024 8 AM 32 Good Hangar Fenceline - N Center 09/4/2024 8 AM 34 Good Hangar Fenceline - N Corner 09/4/2024 8 AM 23 Good Hangar Fenceline - NE Corner 09/4/2024 8 AM 35 Good Hangar Fenceline - NE Side 09/4/2024 8 AM 25 Good Hangar Fenceline - S Corner 09/4/2024 8 AM 29 Good Hangar Fenceline - S Side 09/4/2024 8 AM 31 Good Hangar Fenceline - SW Corner 09/4/2024 8 AM 35 Good Hangar Fenceline - SW Side 09/4/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/4/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 09/4/2024 8 AM 31 Good Moffett and Tustin Ranch 09/4/2024 8 AM 32 Good Valencia and Armstrong 09/4/2024 8 AM 27 Good Valencia and Columbus Square 09/4/2024 8 AM 37 Good Valencia and Legacy 09/4/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 09/4/2024 8 AM 25 Good Warner Avenue 09/4/2024 8 AM 29 Good Warner and Armstrong 09/4/2024 8 AM 36 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, September 5, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/5/2024 8 AM Matter 14 Level of Concern Good Hangar Fenceline - E Side 09/5/2024 8 AM 20 Good Hangar Fenceline - N Center 09/5/2024 8 AM 20 Good Hangar Fenceline - N Corner 09/5/2024 8 AM 12 Good Hangar Fenceline - NE Corner 09/5/2024 8 AM 22 Good Hangar Fenceline - NE Side 09/5/2024 8 AM 15 Good Hangar Fenceline - S Corner 09/5/2024 8 AM ** ** Hangar Fenceline - S Side 09/5/2024 8 AM 21 Good Hangar Fenceline - SW Corner 09/5/2024 8 AM 22 Good Hangar Fenceline - SW Side 09/5/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/5/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 09/5/2024 8 AM 18 Good Moffett and Tustin Ranch 09/5/2024 8 AM ** ** Valencia and Armstrong 09/5/2024 8 AM 19 Good Valencia and Columbus Square 09/5/2024 8 AM ** ** Valencia and Legacy 09/5/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 09/5/2024 8 AM 16 Good Warner Avenue 09/5/2024 8 AM 18 Good Warner and Armstrong 09/5/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, September 6, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/6/2024 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 09/6/2024 8 AM 19 Good Hangar Fenceline - N Center 09/6/2024 8 AM 19 Good Hangar Fenceline - N Corner 09/6/2024 8 AM 11 Good Hangar Fenceline - NE Corner 09/6/2024 8 AM 21 Good Hangar Fenceline - NE Side 09/6/2024 8 AM 15 Good Hangar Fenceline - S Corner 09/6/2024 8 AM 21 Good Hangar Fenceline - S Side 09/6/2024 8 AM 20 Good Hangar Fenceline - SW Corner 09/6/2024 8 AM 21 Good Hangar Fenceline - SW Side 09/6/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/6/2024 8 AM Particulate Matter • 10 Level of Concern Good Legacy Road 09/6/2024 8 AM 19 Good Moffett and Tustin Ranch 09/6/2024 8 AM 18 Good Valencia and Armstrong 09/6/2024 8 AM 17 Good Valencia and Columbus Square 09/6/2024 8 AM 27 Good Valencia and Legacy 09/6/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 09/6/2024 8 AM 14 Good Warner Avenue 09/6/2024 8 AM ** Good Warner and Armstrong 09/6/2024 8 AM ** Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, September 7, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/7/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 09/7/2024 8 AM 2S Good Hangar Fenceline - N Center 09/7/2024 8 AM 26 Good Hangar Fenceline - N Corner 09/7/2024 8 AM 18 Good Hangar Fenceline - NE Corner 09/7/2024 8 AM 29 Good Hangar Fenceline - NE Side 09/7/2024 8 AM 21 Good Hangar Fenceline - S Corner 09/7/2024 8 AM ** ** Hangar Fenceline - S Side 09/7/2024 8 AM 28 Good Hangar Fenceline - SW Corner 09/7/2024 8 AM 28 Good Hangar Fenceline - SW Side 09/7/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/7/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 09/7/2024 8 AM 28 Good Moffett and Tustin Ranch 09/7/2024 8 AM 25 Good Valencia and Armstrong 09/7/2024 8 AM 22 Good Valencia and Columbus Square 09/7/2024 8 AM 32 Good Valencia and Legacy 09/7/2024 8 AM 27 Good Victory and Tustin Ranch Rd. 09/7/2024 8 AM 20 Good Warner Avenue 09/7/2024 8 AM 25 Good Warner and Armstrong 09/7/2024 8 AM 32 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, September 8, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/8/2024 8 AM Particulate Matter 27 Level of Concern Good Hangar Fenceline - E Side 09/8/2024 8 AM 38 Good Hangar Fenceline - N Center 09/8/2024 8 AM 37 Good Hangar Fenceline - N Corner 09/8/2024 8 AM 29 Good Hangar Fenceline - NE Corner 09/8/2024 8 AM 41 Good Hangar Fenceline - NE Side 09/8/2024 8 AM 31 Good Hangar Fenceline - S Corner 09/8/2024 8 AM 34 Good Hangar Fenceline - S Side 09/8/2024 8 AM 39 Good Hangar Fenceline - SW Corner 09/8/2024 8 AM 40 Good Hangar Fenceline - SW Side 09/8/2024 8 AM 32 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/8/2024 8 AM Particulate Matter • 24 Level of Concern Good Legacy Road 09/8/2024 8 AM 42 Good Moffett and Tustin Ranch 09/8/2024 8 AM 37 Good Valencia and Armstrong 09/8/2024 8 AM 33 Good Valencia and Columbus Square 09/8/2024 8 AM 43 Good Valencia and Legacy 09/8/2024 8 AM 38 Good Victory and Tustin Ranch Rd. 09/8/2024 8 AM 33 Good Warner Avenue 09/8/2024 8 AM 35 Good Warner and Armstrong 09/8/2024 8 AM 47 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, September 9, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/9/2024 8 AM Particulate Matter 19 Level of Concern Good Hangar Fenceline - E Side 09/9/2024 8 AM 25 Good Hangar Fenceline - N Center 09/9/2024 8 AM 25 Good Hangar Fenceline - N Corner 09/9/2024 8 AM 18 Good Hangar Fenceline - NE Corner 09/9/2024 8 AM 27 Good Hangar Fenceline - NE Side 09/9/2024 8 AM 19 Good Hangar Fenceline - S Corner 09/9/2024 8 AM 23 Good Hangar Fenceline - S Side 09/9/2024 8 AM 29 Good Hangar Fenceline - SW Corner 09/9/2024 8 AM 27 Good Hangar Fenceline - SW Side 09/9/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/9/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 09/9/2024 8 AM 27 Good Moffett and Tustin Ranch 09/9/2024 8 AM 25 Good Valencia and Armstrong 09/9/2024 8 AM 23 Good Valencia and Columbus Square 09/9/2024 8 AM 32 Good Valencia and Legacy 09/9/2024 8 AM 27 Good Victory and Tustin Ranch Rd. 09/9/2024 8 AM 22 Good Warner Avenue 09/9/2024 8 AM 25 Good Warner and Armstrong 09/9/2024 8 AM 30 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, September 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/10/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 09/10/2024 8 AM 25 Good Hangar Fenceline - N Center 09/10/2024 8 AM 24 Good Hangar Fenceline - N Corner 09/10/2024 8 AM 20 Good Hangar Fenceline - NE Corner 09/10/2024 8 AM 28 Good Hangar Fenceline - NE Side 09/10/2024 8 AM 18 Good Hangar Fenceline - S Corner 09/10/2024 8 AM ** ** Hangar Fenceline - S Side 09/10/2024 8 AM 27 Good Hangar Fenceline - SW Corner 09/10/2024 8 AM 26 Good Hangar Fenceline - SW Side 09/10/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/10/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 09/10/2024 8 AM 23 Good Moffett and Tustin Ranch 09/10/2024 8 AM 23 Good Valencia and Armstrong 09/10/2024 8 AM 23 Good Valencia and Columbus Square 09/10/2024 8 AM 32 Good Valencia and Legacy 09/10/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 09/10/2024 8 AM 20 Good Warner Avenue 09/10/2024 8 AM 22 Good Warner and Armstrong 09/10/2024 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, September 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/11/2024 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 09/11/2024 8 AM 18 Good Hangar Fenceline - N Center 09/11/2024 8 AM 17 Good Hangar Fenceline - N Corner 09/11/2024 8 AM 15 Good Hangar Fenceline - NE Corner 09/11/2024 8 AM 17 Good Hangar Fenceline - NE Side 09/11/2024 8 AM 13 Good Hangar Fenceline - S Corner 09/11/2024 8 AM 17 Good Hangar Fenceline - S Side 09/11/2024 8 AM 16 Good Hangar Fenceline - SW Corner 09/11/2024 8 AM 17 Good Hangar Fenceline - SW Side 09/11/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/11/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 09/11/2024 8 AM 15 Good Moffett and Tustin Ranch 09/11/2024 8 AM 16 Good Valencia and Armstrong 09/11/2024 8 AM 17 Good Valencia and Columbus Square 09/11/2024 8 AM 22 Good Valencia and Legacy 09/11/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 09/11/2024 8 AM 13 Good Warner Avenue 09/11/2024 8 AM 15 Good Warner and Armstrong 09/11/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, September 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/12/2024 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 09/12/2024 8 AM 15 Good Hangar Fenceline - N Center 09/12/2024 8 AM 15 Good Hangar Fenceline - N Corner 09/12/2024 8 AM 13 Good Hangar Fenceline - NE Corner 09/12/2024 8 AM 18 Good Hangar Fenceline - NE Side 09/12/2024 8 AM 12 Good Hangar Fenceline - S Corner 09/12/2024 8 AM 15 Good Hangar Fenceline - S Side 09/12/2024 8 AM 14 Good Hangar Fenceline - SW Corner 09/12/2024 8 AM 16 Good Hangar Fenceline - SW Side 09/12/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/12/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 09/12/2024 8 AM 15 Good Moffett and Tustin Ranch 09/12/2024 8 AM 15 Good Valencia and Armstrong 09/12/2024 8 AM 13 Good Valencia and Columbus Square 09/12/2024 8 AM 18 Good Valencia and Legacy 09/12/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 09/12/2024 8 AM 12 Good Warner Avenue 09/12/2024 8 AM 14 Good Warner and Armstrong 09/12/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, September 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/13/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 09/13/2024 8 AM 18 Good Hangar Fenceline - N Center 09/13/2024 8 AM 18 Good Hangar Fenceline - N Corner 09/13/2024 8 AM 16 Good Hangar Fenceline - NE Corner 09/13/2024 8 AM 21 Good Hangar Fenceline - NE Side 09/13/2024 8 AM 14 Good Hangar Fenceline - S Corner 09/13/2024 8 AM ** ** Hangar Fenceline - S Side 09/13/2024 8 AM 18 Good Hangar Fenceline - SW Corner 09/13/2024 8 AM 19 Good Hangar Fenceline - SW Side 09/13/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/13/2024 8 AM Particulate Matter • 10 Level of Concern Good Legacy Road 09/13/2024 8 AM 18 Good Moffett and Tustin Ranch 09/13/2024 8 AM 18 Good Valencia and Armstrong 09/13/2024 8 AM 15 Good Valencia and Columbus Square 09/13/2024 8 AM 21 Good Valencia and Legacy 09/13/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 09/13/2024 8 AM 14 Good Warner Avenue 09/13/2024 8 AM 15 Good Warner and Armstrong 09/13/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, September 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/14/2024 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 09/14/2024 8 AM 19 Good Hangar Fenceline - N Center 09/14/2024 8 AM 19 Good Hangar Fenceline - N Corner 09/14/2024 8 AM 17 Good Hangar Fenceline - NE Corner 09/14/2024 8 AM 21 Good Hangar Fenceline - NE Side 09/14/2024 8 AM 15 Good Hangar Fenceline - S Corner 09/14/2024 8 AM ** ** Hangar Fenceline - S Side 09/14/2024 8 AM 19 Good Hangar Fenceline - SW Corner 09/14/2024 8 AM 21 Good Hangar Fenceline - SW Side 09/14/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/14/2024 8 AM Particulate Matter • 12 Level of Concern Good Legacy Road 09/14/2024 8 AM 19 Good Moffett and Tustin Ranch 09/14/2024 8 AM 18 Good Valencia and Armstrong 09/14/2024 8 AM 16 Good Valencia and Columbus Square 09/14/2024 8 AM 21 Good Valencia and Legacy 09/14/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 09/14/2024 8 AM 15 Good Warner Avenue 09/14/2024 8 AM 16 Good Warner and Armstrong 09/14/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, September 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/15/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 09/15/2024 8 AM 21 Good Hangar Fenceline - N Center 09/15/2024 8 AM 21 Good Hangar Fenceline - N Corner 09/15/2024 8 AM 18 Good Hangar Fenceline - NE Corner 09/15/2024 8 AM 24 Good Hangar Fenceline - NE Side 09/15/2024 8 AM 17 Good Hangar Fenceline - S Corner 09/15/2024 8 AM 22 Good Hangar Fenceline - S Side 09/15/2024 8 AM 21 Good Hangar Fenceline - SW Corner 09/15/2024 8 AM 23 Good Hangar Fenceline - SW Side 09/15/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/15/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 09/15/2024 8 AM 22 Good Moffett and Tustin Ranch 09/15/2024 8 AM 21 Good Valencia and Armstrong 09/15/2024 8 AM 18 Good Valencia and Columbus Square 09/15/2024 8 AM 23 Good Valencia and Legacy 09/15/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 09/15/2024 8 AM 18 Good Warner Avenue 09/15/2024 8 AM 19 Good Warner and Armstrong 09/15/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, September 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/16/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 09/16/2024 8 AM ** ** Hangar Fenceline - N Center 09/16/2024 8 AM 15 Good Hangar Fenceline - N Corner 09/16/2024 8 AM 13 Good Hangar Fenceline - NE Corner 09/16/2024 8 AM 18 Good Hangar Fenceline - NE Side 09/16/2024 8 AM 12 Good Hangar Fenceline - S Corner 09/16/2024 8 AM 15 Good Hangar Fenceline - S Side 09/16/2024 8 AM 15 Good Hangar Fenceline - SW Corner 09/16/2024 8 AM 16 Good Hangar Fenceline - SW Side 09/16/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/16/2024 8 AM Particulate Matter • 10 Level of Concern Good Legacy Road 09/16/2024 8 AM 15 Good Moffett and Tustin Ranch 09/16/2024 8 AM 15 Good Valencia and Armstrong 09/16/2024 8 AM 14 Good Valencia and Columbus Square 09/16/2024 8 AM 17 Good Valencia and Legacy 09/16/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 09/16/2024 8 AM 13 Good Warner Avenue 09/16/2024 8 AM 14 Good Warner and Armstrong 09/16/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, September 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for �nhealthy Sensitive Groups (255 to Unhealthy (155 to 254)354) * See below for further category descriptions. Very Unhealthy (355 to 424) Columbus Square Park PeriodLocation 24-Hour Ending 09/17/2024 8 AM Particulate Matter 5 Level of Concern Good Hangar Fenceline - E Side 09/17/2024 8 AM 10 Good Hangar Fenceline - N Center 09/17/2024 8 AM 10 Good Hangar Fenceline - N Corner 09/17/2024 8 AM 9 Good Hangar Fenceline - NE Corner 09/17/2024 8 AM 11 Good Hangar Fenceline - NE Side 09/17/2024 8 AM 6 Good Hangar Fenceline - S Corner 09/17/2024 8 AM 10 Good Hangar Fenceline - S Side 09/17/2024 8 AM 10 Good Hangar Fenceline - SW Corner 09/17/2024 8 AM 10 Good Hangar Fenceline - SW Side 09/17/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/17/2024 8 AM Particulate Matter • 4 Level of Concern Good Legacy Road 09/17/2024 8 AM 9 Good Moffett and Tustin Ranch 09/17/2024 8 AM 9 Good Valencia and Armstrong 09/17/2024 8 AM 8 Good Valencia and Columbus Square 09/17/2024 8 AM 11 Good Valencia and Legacy 09/17/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 09/17/2024 8 AM 7 Good Warner Avenue 09/17/2024 8 AM 8 Good Warner and Armstrong 09/17/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous04 Health warning of emergency more conditions: ever• - is likely • be affected. Wednesday, September 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/18/2024 8 AM Particulate Matter 7 Level of Concern Good Hangar Fenceline - E Side 09/18/2024 8 AM 12 Good Hangar Fenceline - N Center 09/18/2024 8 AM 12 Good Hangar Fenceline - N Corner 09/18/2024 8 AM 10 Good Hangar Fenceline - NE Corner 09/18/2024 8 AM 12 Good Hangar Fenceline - NE Side 09/18/2024 8 AM 9 Good Hangar Fenceline - S Corner 09/18/2024 8 AM 10 Good Hangar Fenceline - S Side 09/18/2024 8 AM 10 Good Hangar Fenceline - SW Corner 09/18/2024 8 AM 12 Good Hangar Fenceline - SW Side 09/18/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/18/2024 8 AM Particulate Matter • 4 Level of Concern Good Legacy Road 09/18/2024 8 AM 11 Good Moffett and Tustin Ranch 09/18/2024 8 AM 11 Good Valencia and Armstrong 09/18/2024 8 AM 10 Good Valencia and Columbus Square 09/18/2024 8 AM 14 Good Valencia and Legacy 09/18/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 09/18/2024 8 AM 9 Good Warner Avenue 09/18/2024 8 AM 9 Good Warner and Armstrong 09/18/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, September 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/19/2024 8 AM Particulate Matter 9 Level of Concern Good Hangar Fenceline - E Side 09/19/2024 8 AM 12 Good Hangar Fenceline - N Center 09/19/2024 8 AM 12 Good Hangar Fenceline - N Corner 09/19/2024 8 AM 10 Good Hangar Fenceline - NE Corner 09/19/2024 8 AM 15 Good Hangar Fenceline - NE Side 09/19/2024 8 AM 9 Good Hangar Fenceline - S Corner 09/19/2024 8 AM 11 Good Hangar Fenceline - S Side 09/19/2024 8 AM 11 Good Hangar Fenceline - SW Corner 09/19/2024 8 AM 13 Good Hangar Fenceline - SW Side 09/19/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/19/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 09/19/2024 8 AM 12 Good Moffett and Tustin Ranch 09/19/2024 8 AM 11 Good Valencia and Armstrong 09/19/2024 8 AM 10 Good Valencia and Columbus Square 09/19/2024 8 AM 15 Good Valencia and Legacy 09/19/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 09/19/2024 8 AM 9 Good Warner Avenue 09/19/2024 8 AM 11 Good Warner and Armstrong 09/19/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, September 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/20/2024 8 AM Particulate Matter 10 Level of Concern Good Hangar Fenceline - E Side 09/20/2024 8 AM 13 Good Hangar Fenceline - N Center 09/20/2024 8 AM 13 Good Hangar Fenceline - N Corner 09/20/2024 8 AM 11 Good Hangar Fenceline - NE Corner 09/20/2024 8 AM 15 Good Hangar Fenceline - NE Side 09/20/2024 8 AM 9 Good Hangar Fenceline - S Corner 09/20/2024 8 AM 13 Good Hangar Fenceline - S Side 09/20/2024 8 AM 12 Good Hangar Fenceline - SW Corner 09/20/2024 8 AM 14 Good Hangar Fenceline - SW Side 09/20/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/20/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 09/20/2024 8 AM 13 Good Moffett and Tustin Ranch 09/20/2024 8 AM 12 Good Valencia and Armstrong 09/20/2024 8 AM 10 Good Valencia and Columbus Square 09/20/2024 8 AM 14 Good Valencia and Legacy 09/20/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 09/20/2024 8 AM 10 Good Warner Avenue 09/20/2024 8 AM 11 Good Warner and Armstrong 09/20/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, September21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 09/21/2024 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - E Side 09/21/2024 8 AM 13 Good Hangar Fenceline - N Center 09/21/2024 8 AM 13 Good Hangar Fenceline - N Corner 09/21/2024 8 AM 11 Good Hangar Fenceline - NE Corner 09/21/2024 8 AM 15 Good Hangar Fenceline - NE Side 09/21/2024 8 AM 10 Good Hangar Fenceline - S Corner 09/21/2024 8 AM 12 Good Hangar Fenceline - S Side 09/21/2024 8 AM 13 Good Hangar Fenceline - SW Corner 09/21/2024 8 AM 14 Good Hangar Fenceline - SW Side 09/21/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/21/2024 8 AM Particulate Matter • 9 Level of Concern Good Legacy Road 09/21/2024 8 AM 13 Good Moffett and Tustin Ranch 09/21/2024 8 AM 13 Good Valencia and Armstrong 09/21/2024 8 AM 11 Good Valencia and Columbus Square 09/21/2024 8 AM 16 Good Valencia and Legacy 09/21/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 09/21/2024 8 AM 11 Good Warner Avenue 09/21/2024 8 AM 12 Good Warner and Armstrong 09/21/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, September 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/22/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 09/22/2024 8 AM 22 Good Hangar Fenceline - N Center 09/22/2024 8 AM 21 Good Hangar Fenceline - N Corner 09/22/2024 8 AM 18 Good Hangar Fenceline - NE Corner 09/22/2024 8 AM 24 Good Hangar Fenceline - NE Side 09/22/2024 8 AM 17 Good Hangar Fenceline - S Corner 09/22/2024 8 AM ** ** Hangar Fenceline - S Side 09/22/2024 8 AM 20 Good Hangar Fenceline - SW Corner 09/22/2024 8 AM 23 Good Hangar Fenceline - SW Side 09/22/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/22/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 09/22/2024 8 AM 22 Good Moffett and Tustin Ranch 09/22/2024 8 AM 21 Good Valencia and Armstrong 09/22/2024 8 AM 17 Good Valencia and Columbus Square 09/22/2024 8 AM 23 Good Valencia and Legacy 09/22/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 09/22/2024 8 AM 17 Good Warner Avenue 09/22/2024 8 AM ** ** Warner and Armstrong 09/22/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, September 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/23/2024 8 AM Matter 43 Level of Concern Good Hangar Fenceline - E Side 09/23/2024 8 AM 54 Good Hangar Fenceline - N Center 09/23/2024 8 AM 55 Moderate Hangar Fenceline - N Corner 09/23/2024 8 AM 43 Good Hangar Fenceline - NE Corner 09/23/2024 8 AM 61 Moderate Hangar Fenceline - NE Side 09/23/2024 8 AM 41 Good Hangar Fenceline - S Corner 09/23/2024 8 AM ** ** Hangar Fenceline - S Side 09/23/2024 8 AM 50 Good Hangar Fenceline - SW Corner 09/23/2024 8 AM 59 Moderate Hangar Fenceline - SW Side 09/23/2024 8 AM 46 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/23/2024 8 AM Particulate Matter • 33 Level of Concern Good Legacy Road 09/23/2024 8 AM 53 Good Moffett and Tustin Ranch 09/23/2024 8 AM 54 Good Valencia and Armstrong 09/23/2024 8 AM 44 Good Valencia and Columbus Square 09/23/2024 8 AM 58 Moderate Valencia and Legacy 09/23/2024 8 AM 49 Good Victory and Tustin Ranch Rd. 09/23/2024 8 AM 46 Good Warner Avenue 09/23/2024 8 AM 45 Good Warner and Armstrong 09/23/2024 8 AM 52 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, September 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/23/2024 8 AM Matter 38 Level of Concern Good Hangar Fenceline - E Side 09/23/2024 8 AM 46 Good Hangar Fenceline - N Center 09/23/2024 8 AM 42 Good Hangar Fenceline - N Corner 09/23/2024 8 AM 37 Good Hangar Fenceline - NE Corner 09/23/2024 8 AM 51 Good Hangar Fenceline - NE Side 09/23/2024 8 AM 35 Good Hangar Fenceline - S Corner 09/23/2024 8 AM ** ** Hangar Fenceline - S Side 09/23/2024 8 AM 42 Good Hangar Fenceline - SW Corner 09/23/2024 8 AM 49 Good Hangar Fenceline - SW Side 09/23/2024 8 AM 39 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/23/2024 8 AM Particulate Matter • 31 Level of Concern Good Legacy Road 09/23/2024 8 AM 47 Good Moffett and Tustin Ranch 09/23/2024 8 AM 45 Good Valencia and Armstrong 09/23/2024 8 AM 38 Good Valencia and Columbus Square 09/23/2024 8 AM 49 Good Valencia and Legacy 09/23/2024 8 AM 43 Good Victory and Tustin Ranch Rd. 09/23/2024 8 AM ** ** Warner Avenue 09/23/2024 8 AM 39 Good Warner and Armstrong 09/23/2024 8 AM 43 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, September 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/25/2024 8 AM Matter 32 Level of Concern Good Hangar Fenceline - E Side 09/25/2024 8 AM 36 Good Hangar Fenceline - N Center 09/25/2024 8 AM 38 Good Hangar Fenceline - N Corner 09/25/2024 8 AM 29 Good Hangar Fenceline - NE Corner 09/25/2024 8 AM 41 Good Hangar Fenceline - NE Side 09/25/2024 8 AM 28 Good Hangar Fenceline - S Corner 09/25/2024 8 AM ** ** Hangar Fenceline - S Side 09/25/2024 8 AM 32 Good Hangar Fenceline - SW Corner 09/25/2024 8 AM 40 Good Hangar Fenceline - SW Side 09/25/2024 8 AM 31 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/25/2024 8 AM Particulate Matter • 27 Level of Concern Good Legacy Road 09/25/2024 8 AM 38 Good Moffett and Tustin Ranch 09/25/2024 8 AM 37 Good Valencia and Armstrong 09/25/2024 8 AM 30 Good Valencia and Columbus Square 09/25/2024 8 AM 39 Good Valencia and Legacy 09/25/2024 8 AM 35 Good Victory and Tustin Ranch Rd. 09/25/2024 8 AM 32 Good Warner Avenue 09/25/2024 8 AM 31 Good Warner and Armstrong 09/25/2024 8 AM 35 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, September 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/26/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 09/26/2024 8 AM 28 Good Hangar Fenceline - N Center 09/26/2024 8 AM 31 Good Hangar Fenceline - N Corner 09/26/2024 8 AM 24 Good Hangar Fenceline - NE Corner 09/26/2024 8 AM 31 Good Hangar Fenceline - NE Side 09/26/2024 8 AM 24 Good Hangar Fenceline - S Corner 09/26/2024 8 AM ** ** Hangar Fenceline - S Side 09/26/2024 8 AM 27 Good Hangar Fenceline - SW Corner 09/26/2024 8 AM 34 Good Hangar Fenceline - SW Side 09/26/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/26/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 09/26/2024 8 AM 31 Good Moffett and Tustin Ranch 09/26/2024 8 AM 30 Good Valencia and Armstrong 09/26/2024 8 AM 26 Good Valencia and Columbus Square 09/26/2024 8 AM 32 Good Valencia and Legacy 09/26/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 09/26/2024 8 AM 25 Good Warner Avenue 09/26/2024 8 AM 25 Good Warner and Armstrong 09/26/2024 8 AM 30 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, September 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/27/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 09/27/2024 8 AM ** ** Hangar Fenceline - N Center 09/27/2024 8 AM 36 Good Hangar Fenceline - N Corner 09/27/2024 8 AM 27 Good Hangar Fenceline - NE Corner 09/27/2024 8 AM 36 Good Hangar Fenceline - NE Side 09/27/2024 8 AM 26 Good Hangar Fenceline - S Corner 09/27/2024 8 AM 30 Good Hangar Fenceline - S Side 09/27/2024 8 AM 30 Good Hangar Fenceline - SW Corner 09/27/2024 8 AM 39 Good Hangar Fenceline - SW Side 09/27/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 09/27/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 09/27/2024 8 AM 30 Good Moffett and Tustin Ranch 09/27/2024 8 AM 34 Good Valencia and Armstrong 09/27/2024 8 AM 28 Good Valencia and Columbus Square 09/27/2024 8 AM 39 Good Valencia and Legacy 09/27/2024 8 AM 33 Good Victory and Tustin Ranch Rd. 09/27/2024 8 AM 27 Good Warner Avenue 09/27/2024 8 AM 30 Good Warner and Armstrong 09/27/2024 8 AM 35 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, September 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/28/2024 8 AM Matter 25 Level of Concern Good Hangar Fenceline - E Side 09/28/2024 8 AM 30 Good Hangar Fenceline - N Center 09/28/2024 8 AM 32 Good Hangar Fenceline - N Corner 09/28/2024 8 AM 24 Good Hangar Fenceline - NE Corner 09/28/2024 8 AM 34 Good Hangar Fenceline - NE Side 09/28/2024 8 AM 23 Good Hangar Fenceline - S Corner 09/28/2024 8 AM 23 Good Hangar Fenceline - S Side 09/28/2024 8 AM 28 Good Hangar Fenceline - SW Corner 09/28/2024 8 AM 34 Good Hangar Fenceline - SW Side 09/28/2024 8 AM 26 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/28/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 09/28/2024 8 AM 26 Good Moffett and Tustin Ranch 09/28/2024 8 AM 30 Good Valencia and Armstrong 09/28/2024 8 AM 26 Good Valencia and Columbus Square 09/28/2024 8 AM 32 Good Valencia and Legacy 09/28/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 09/28/2024 8 AM 25 Good Warner Avenue 09/28/2024 8 AM 27 Good Warner and Armstrong 09/28/2024 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, September 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/29/2024 8 AM Matter 33 Level of Concern Good Hangar Fenceline - E Side 09/29/2024 8 AM ** ** Hangar Fenceline - N Center 09/29/2024 8 AM 43 Good Hangar Fenceline - N Corner 09/29/2024 8 AM 33 Good Hangar Fenceline - NE Corner 09/29/2024 8 AM 45 Good Hangar Fenceline - NE Side 09/29/2024 8 AM 31 Good Hangar Fenceline - S Corner 09/29/2024 8 AM 31 Good Hangar Fenceline - S Side 09/29/2024 8 AM 38 Good Hangar Fenceline - SW Corner 09/29/2024 8 AM 47 Good Hangar Fenceline - SW Side 09/29/2024 8 AM 34 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/29/2024 8 AM Particulate Matter • 29 Level of Concern Good Legacy Road 09/29/2024 8 AM 36 Good Moffett and Tustin Ranch 09/29/2024 8 AM 41 Good Valencia and Armstrong 09/29/2024 8 AM 35 Good Valencia and Columbus Square 09/29/2024 8 AM 44 Good Valencia and Legacy 09/29/2024 8 AM 39 Good Victory and Tustin Ranch Rd. 09/29/2024 8 AM 33 Good Warner Avenue 09/29/2024 8 AM 37 Good Warner and Armstrong 09/29/2024 8 AM 42 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, September 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 09/30/2024 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 09/30/2024 8 AM 34 Good Hangar Fenceline - N Center 09/30/2024 8 AM 40 Good Hangar Fenceline - N Corner 09/30/2024 8 AM 30 Good Hangar Fenceline - NE Corner 09/30/2024 8 AM 41 Good Hangar Fenceline - NE Side 09/30/2024 8 AM 28 Good Hangar Fenceline - S Corner 09/30/2024 8 AM 29 Good Hangar Fenceline - S Side 09/30/2024 8 AM 34 Good Hangar Fenceline - SW Corner 09/30/2024 8 AM 44 Good Hangar Fenceline - SW Side 09/30/2024 8 AM 32 Good • •24-Hour Hangar Fenceline - W Side Period • • 09/30/2024 8 AM Particulate Matter • 27 Level of Concern Good Legacy Road 09/30/2024 8 AM ** ** Moffett and Tustin Ranch 09/30/2024 8 AM 39 Good Valencia and Armstrong 09/30/2024 8 AM 31 Good Valencia and Columbus Square 09/30/2024 8 AM 41 Good Valencia and Legacy 09/30/2024 8 AM 36 Good Victory and Tustin Ranch Rd. 09/30/2024 8 AM 31 Good Warner Avenue 09/30/2024 8 AM 34 Good Warner and Armstrong 09/30/2024 8 AM 40 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, October 1, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/01/2024 8 AM Matter 39 Level of Concern Good Hangar Fenceline - E Side 10/01/2024 8 AM 44 Good Hangar Fenceline - N Center 10/01/2024 8 AM ** ** Hangar Fenceline - N Corner 10/01/2024 8 AM 33 Good Hangar Fenceline - NE Corner 10/01/2024 8 AM 46 Good Hangar Fenceline - NE Side 10/01/2024 8 AM 33 Good Hangar Fenceline - S Corner 10/01/2024 8 AM 34 Good Hangar Fenceline - S Side 10/01/2024 8 AM 40 Good Hangar Fenceline - SW Corner 10/01/2024 8 AM 54 Good Hangar Fenceline - SW Side 10/01/2024 8 AM 39 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/01/2024 8 AM Particulate Matter • 32 Level of Concern Good Legacy Road 10/01/2024 8 AM ** ** Moffett and Tustin Ranch 10/01/2024 8 AM 47 Good Valencia and Armstrong 10/01/2024 8 AM 37 Good Valencia and Columbus Square 10/01/2024 8 AM 50 Good Valencia and Legacy 10/01/2024 8 AM 42 Good Victory and Tustin Ranch Rd. 10/01/2024 8 AM 37 Good Warner Avenue 10/01/2024 8 AM 41 Good Warner and Armstrong 10/01/2024 8 AM 50 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, October 2, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/02/2024 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 10/02/2024 8 AM 34 Good Hangar Fenceline - N Center 10/02/2024 8 AM 36 Good Hangar Fenceline - N Corner 10/02/2024 8 AM 28 Good Hangar Fenceline - NE Corner 10/02/2024 8 AM 39 Good Hangar Fenceline - NE Side 10/02/2024 8 AM 26 Good Hangar Fenceline - S Corner 10/02/2024 8 AM 27 Good Hangar Fenceline - S Side 10/02/2024 8 AM 33 Good Hangar Fenceline - SW Corner 10/02/2024 8 AM 42 Good Hangar Fenceline - SW Side 10/02/2024 8 AM 29 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/02/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 10/02/2024 8 AM 31 Good Moffett and Tustin Ranch 10/02/2024 8 AM 37 Good Valencia and Armstrong 10/02/2024 8 AM 28 Good Valencia and Columbus Square 10/02/2024 8 AM 40 Good Valencia and Legacy 10/02/2024 8 AM 34 Good Victory and Tustin Ranch Rd. 10/02/2024 8 AM 29 Good Warner Avenue 10/02/2024 8 AM 31 Good Warner and Armstrong 10/02/2024 8 AM 38 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, October 3, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/03/2024 8 AM Matter 29 Level of Concern Good Hangar Fenceline - E Side 10/03/2024 8 AM 30 Good Hangar Fenceline - N Center 10/03/2024 8 AM 32 Good Hangar Fenceline - N Corner 10/03/2024 8 AM 23 Good Hangar Fenceline - NE Corner 10/03/2024 8 AM 34 Good Hangar Fenceline - NE Side 10/03/2024 8 AM 23 Good Hangar Fenceline - S Corner 10/03/2024 8 AM 25 Good Hangar Fenceline - S Side 10/03/2024 8 AM 27 Good Hangar Fenceline - SW Corner 10/03/2024 8 AM 37 Good Hangar Fenceline - SW Side 10/03/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/03/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 10/03/2024 8 AM ** ** Moffett and Tustin Ranch 10/03/2024 8 AM 36 Good Valencia and Armstrong 10/03/2024 8 AM 23 Good Valencia and Columbus Square 10/03/2024 8 AM 35 Good Valencia and Legacy 10/03/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 10/03/2024 8 AM 26 Good Warner Avenue 10/03/2024 8 AM 28 Good Warner and Armstrong 10/03/2024 8 AM 34 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, October 4, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/04/2024 8 AM Matter 33 Level of Concern Good Hangar Fenceline - E Side 10/04/2024 8 AM 37 Good Hangar Fenceline - N Center 10/04/2024 8 AM 39 Good Hangar Fenceline - N Corner 10/04/2024 8 AM 30 Good Hangar Fenceline - NE Corner 10/04/2024 8 AM 41 Good Hangar Fenceline - NE Side 10/04/2024 8 AM 28 Good Hangar Fenceline - S Corner 10/04/2024 8 AM 28 Good Hangar Fenceline - S Side 10/04/2024 8 AM 34 Good Hangar Fenceline - SW Corner 10/04/2024 8 AM 44 Good Hangar Fenceline - SW Side 10/04/2024 8 AM 31 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/04/2024 8 AM Particulate Matter • 28 Level of Concern Good Legacy Road 10/04/2024 8 AM 33 Good Moffett and Tustin Ranch 10/04/2024 8 AM 37 Good Valencia and Armstrong 10/04/2024 8 AM 31 Good Valencia and Columbus Square 10/04/2024 8 AM 43 Good Valencia and Legacy 10/04/2024 8 AM ** ** Victory and Tustin Ranch Rd. 10/04/2024 8 AM 31 Good Warner Avenue 10/04/2024 8 AM 33 Good Warner and Armstrong 10/04/2024 8 AM 38 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, October 5, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/05/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 10/05/2024 8 AM 47 Good Hangar Fenceline - N Center 10/05/2024 8 AM 50 Good Hangar Fenceline - N Corner 10/05/2024 8 AM 43 Good Hangar Fenceline - NE Corner 10/05/2024 8 AM ** ** Hangar Fenceline - NE Side 10/05/2024 8 AM 36 Good Hangar Fenceline - S Corner 10/05/2024 8 AM 36 Good Hangar Fenceline - S Side 10/05/2024 8 AM 44 Good Hangar Fenceline - SW Corner 10/05/2024 8 AM 56 Moderate Hangar Fenceline - SW Side 10/05/2024 8 AM 39 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/05/2024 8 AM Particulate Matter • 33 Level of Concern Good Legacy Road 10/05/2024 8 AM 44 Good Moffett and Tustin Ranch 10/05/2024 8 AM 47 Good Valencia and Armstrong 10/05/2024 8 AM 40 Good Valencia and Columbus Square 10/05/2024 8 AM 54 Good Valencia and Legacy 10/05/2024 8 AM 47 Good Victory and Tustin Ranch Rd. 10/05/2024 8 AM 41 Good Warner Avenue 10/05/2024 8 AM 43 Good Warner and Armstrong 10/05/2024 8 AM 48 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, October 6, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/06/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 10/06/2024 8 AM 54 Good Hangar Fenceline - N Center 10/06/2024 8 AM 58 Moderate Hangar Fenceline - N Corner 10/06/2024 8 AM 47 Good Hangar Fenceline - NE Corner 10/06/2024 8 AM 61 Moderate Hangar Fenceline - NE Side 10/06/2024 8 AM 42 Good Hangar Fenceline - S Corner 10/06/2024 8 AM 41 Good Hangar Fenceline - S Side 10/06/2024 8 AM 52 Good Hangar Fenceline - SW Corner 10/06/2024 8 AM 65 Moderate Hangar Fenceline - SW Side 10/06/2024 8 AM 47 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/06/2024 8 AM Particulate Matter • 40 Level of Concern Good Legacy Road 10/06/2024 8 AM ** ** Moffett and Tustin Ranch 10/06/2024 8 AM 56 Moderate Valencia and Armstrong 10/06/2024 8 AM 48 Good Valencia and Columbus Square 10/06/2024 8 AM 62 Moderate Valencia and Legacy 10/06/2024 8 AM 55 Moderate Victory and Tustin Ranch Rd. 10/06/2024 8 AM 50 Good Warner Avenue 10/06/2024 8 AM 49 Good Warner and Armstrong 10/06/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, October 7, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/07/2024 8 AM Particulate Matter 46 Level of Concern Good Hangar Fenceline - E Side 10/07/2024 8 AM 43 Good Hangar Fenceline - N Center 10/07/2024 8 AM 48 Good Hangar Fenceline - N Corner 10/07/2024 8 AM 37 Good Hangar Fenceline - NE Corner 10/07/2024 8 AM 49 Good Hangar Fenceline - NE Side 10/07/2024 8 AM 33 Good Hangar Fenceline - S Corner 10/07/2024 8 AM 30 Good Hangar Fenceline - S Side 10/07/2024 8 AM 43 Good Hangar Fenceline - SW Corner 10/07/2024 8 AM 51 Good Hangar Fenceline - SW Side 10/07/2024 8 AM 39 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/07/2024 8 AM Particulate Matter • 34 Level of Concern Good Legacy Road 10/07/2024 8 AM 41 Good Moffett and Tustin Ranch 10/07/2024 8 AM 45 Good Valencia and Armstrong 10/07/2024 8 AM 37 Good Valencia and Columbus Square 10/07/2024 8 AM 51 Good Valencia and Legacy 10/07/2024 8 AM 43 Good Victory and Tustin Ranch Rd. 10/07/2024 8 AM 39 Good Warner Avenue 10/07/2024 8 AM 39 Good Warner and Armstrong 10/07/2024 8 AM 43 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, October 8, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/08/2024 8 AM Particulate Matter 45 Level of Concern Good Hangar Fenceline - E Side 10/08/2024 8 AM 44 Good Hangar Fenceline - N Center 10/08/2024 8 AM 48 Good Hangar Fenceline - N Corner 10/08/2024 8 AM 36 Good Hangar Fenceline - NE Corner 10/08/2024 8 AM 48 Good Hangar Fenceline - NE Side 10/08/2024 8 AM 32 Good Hangar Fenceline - S Corner 10/08/2024 8 AM 34 Good Hangar Fenceline - S Side 10/08/2024 8 AM 44 Good Hangar Fenceline - SW Corner 10/08/2024 8 AM 54 Good Hangar Fenceline - SW Side 10/08/2024 8 AM 40 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/08/2024 8 AM Particulate Matter • 34 Level of Concern Good Legacy Road 10/08/2024 8 AM 43 Good Moffett and Tustin Ranch 10/08/2024 8 AM 46 Good Valencia and Armstrong 10/08/2024 8 AM 36 Good Valencia and Columbus Square 10/08/2024 8 AM 52 Good Valencia and Legacy 10/08/2024 8 AM 42 Good Victory and Tustin Ranch Rd. 10/08/2024 8 AM 39 Good Warner Avenue 10/08/2024 8 AM 40 Good Warner and Armstrong 10/08/2024 8 AM 46 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, October 9, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/09/2024 8 AM Matter 44 Level of Concern Good Hangar Fenceline - E Side 10/09/2024 8 AM 42 Good Hangar Fenceline - N Center 10/09/2024 8 AM 44 Good Hangar Fenceline - N Corner 10/09/2024 8 AM 36 Good Hangar Fenceline - NE Corner 10/09/2024 8 AM 45 Good Hangar Fenceline - NE Side 10/09/2024 8 AM 32 Good Hangar Fenceline - S Corner 10/09/2024 8 AM 33 Good Hangar Fenceline - S Side 10/09/2024 8 AM 42 Good Hangar Fenceline - SW Corner 10/09/2024 8 AM 48 Good Hangar Fenceline - SW Side 10/09/2024 8 AM 36 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/09/2024 8 AM Particulate Matter • 32 Level of Concern Good Legacy Road 10/09/2024 8 AM 40 Good Moffett and Tustin Ranch 10/09/2024 8 AM 42 Good Valencia and Armstrong 10/09/2024 8 AM 35 Good Valencia and Columbus Square 10/09/2024 8 AM ** ** Valencia and Legacy 10/09/2024 8 AM 41 Good Victory and Tustin Ranch Rd. 10/09/2024 8 AM 37 Good Warner Avenue 10/09/2024 8 AM 38 Good Warner and Armstrong 10/09/2024 8 AM 42 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, October 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/10/2024 8 AM Matter 56 Level of Concern Moderate Hangar Fenceline - E Side 10/10/2024 8 AM 55 Moderate Hangar Fenceline - N Center 10/10/2024 8 AM 59 Moderate Hangar Fenceline - N Corner 10/10/2024 8 AM 48 Good Hangar Fenceline - NE Corner 10/10/2024 8 AM 61 Moderate Hangar Fenceline - NE Side 10/10/2024 8 AM 43 Good Hangar Fenceline - S Corner 10/10/2024 8 AM 44 Good Hangar Fenceline - S Side 10/10/2024 8 AM 55 Moderate Hangar Fenceline - SW Corner 10/10/2024 8 AM 65 Moderate Hangar Fenceline - SW Side 10/10/2024 8 AM 48 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/10/2024 8 AM Particulate Matter • 42 Level of Concern Good Legacy Road 10/10/2024 8 AM 53 Good Moffett and Tustin Ranch 10/10/2024 8 AM 54 Good Valencia and Armstrong 10/10/2024 8 AM 47 Good Valencia and Columbus Square 10/10/2024 8 AM ** ** Valencia and Legacy 10/10/2024 8 AM 53 Good Victory and Tustin Ranch Rd. 10/10/2024 8 AM 48 Good Warner Avenue 10/10/2024 8 AM 49 Good Warner and Armstrong 10/10/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, October 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/10/2024 8 AM Matter 52 Level of Concern Good Hangar Fenceline - E Side 10/10/2024 8 AM 55 Moderate Hangar Fenceline - N Center 10/10/2024 8 AM 62 Moderate Hangar Fenceline - N Corner 10/10/2024 8 AM 47 Good Hangar Fenceline - NE Corner 10/10/2024 8 AM 58 Moderate Hangar Fenceline - NE Side 10/10/2024 8 AM 42 Good Hangar Fenceline - S Corner 10/10/2024 8 AM ** ** Hangar Fenceline - S Side 10/10/2024 8 AM 55 Moderate Hangar Fenceline - SW Corner 10/10/2024 8 AM 66 Moderate Hangar Fenceline - SW Side 10/10/2024 8 AM 48 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/10/2024 8 AM Particulate Matter • 43 Level of Concern Good Legacy Road 10/10/2024 8 AM 54 Good Moffett and Tustin Ranch 10/10/2024 8 AM 59 Moderate Valencia and Armstrong 10/10/2024 8 AM 45 Good Valencia and Columbus Square 10/10/2024 8 AM ** ** Valencia and Legacy 10/10/2024 8 AM 51 Good Victory and Tustin Ranch Rd. 10/10/2024 8 AM 48 Good Warner Avenue 10/10/2024 8 AM 52 Good Warner and Armstrong 10/10/2024 8 AM 67 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, October 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/12/2024 8 AM Particulate Matter 59 Level of Concern Moderate Hangar Fenceline - E Side 10/12/2024 8 AM 61 Moderate Hangar Fenceline - N Center 10/12/2024 8 AM 67 Moderate Hangar Fenceline - N Corner 10/12/2024 8 AM 52 Good Hangar Fenceline - NE Corner 10/12/2024 8 AM 64 Moderate Hangar Fenceline - NE Side 10/12/2024 8 AM 45 Good Hangar Fenceline - S Corner 10/12/2024 8 AM 46 Good Hangar Fenceline - S Side 10/12/2024 8 AM 59 Moderate Hangar Fenceline - SW Corner 10/12/2024 8 AM 72 Moderate Hangar Fenceline - SW Side 10/12/2024 8 AM 53 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/12/2024 8 AM Particulate Matter • 46 Level of Concern Good Legacy Road 10/12/2024 8 AM 57 Moderate Moffett and Tustin Ranch 10/12/2024 8 AM 63 Moderate Valencia and Armstrong 10/12/2024 8 AM 52 Good Valencia and Columbus Square 10/12/2024 8 AM 61 Moderate Valencia and Legacy 10/12/2024 8 AM 58 Moderate Victory and Tustin Ranch Rd. 10/12/2024 8 AM 55 Moderate Warner Avenue 10/12/2024 8 AM 55 Moderate Warner and Armstrong 10/12/2024 8 AM 69 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, October 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/13/2024 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 10/13/2024 8 AM 27 Good Hangar Fenceline - N Center 10/13/2024 8 AM ** ** Hangar Fenceline - N Corner 10/13/2024 8 AM 23 Good Hangar Fenceline - NE Corner 10/13/2024 8 AM 30 Good Hangar Fenceline - NE Side 10/13/2024 8 AM 19 Good Hangar Fenceline - S Corner 10/13/2024 8 AM 20 Good Hangar Fenceline - S Side 10/13/2024 8 AM 25 Good Hangar Fenceline - SW Corner 10/13/2024 8 AM 33 Good Hangar Fenceline - SW Side 10/13/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 10/13/2024 8 AM Particulate Matter • 20 Level of Concern Good Legacy Road 10/13/2024 8 AM 25 Good Moffett and Tustin Ranch 10/13/2024 8 AM 26 Good Valencia and Armstrong 10/13/2024 8 AM 23 Good Valencia and Columbus Square 10/13/2024 8 AM 29 Good Valencia and Legacy 10/13/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 10/13/2024 8 AM 26 Good Warner Avenue 10/13/2024 8 AM 24 Good Warner and Armstrong 10/13/2024 8 AM 24 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, October 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/14/2024 8 AM Matter 17 Level of Concern Good Hangar Fenceline - E Side 10/14/2024 8 AM 15 Good Hangar Fenceline - N Center 10/14/2024 8 AM 15 Good Hangar Fenceline - N Corner 10/14/2024 8 AM 13 Good Hangar Fenceline - NE Corner 10/14/2024 8 AM ** ** Hangar Fenceline - NE Side 10/14/2024 8 AM 11 Good Hangar Fenceline - S Corner 10/14/2024 8 AM 12 Good Hangar Fenceline - S Side 10/14/2024 8 AM 16 Good Hangar Fenceline - SW Corner 10/14/2024 8 AM 18 Good Hangar Fenceline - SW Side 10/14/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/14/2024 8 AM Particulate Matter • 12 Level of Concern Good Legacy Road 10/14/2024 8 AM 15 Good Moffett and Tustin Ranch 10/14/2024 8 AM 15 Good Valencia and Armstrong 10/14/2024 8 AM 23 Good Valencia and Columbus Square 10/14/2024 8 AM 16 Good Valencia and Legacy 10/14/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 10/14/2024 8 AM 14 Good Warner Avenue 10/14/2024 8 AM 14 Good Warner and Armstrong 10/14/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, October 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/15/2024 8 AM Particulate Matter 10 Level of Concern Good Hangar Fenceline - E Side 10/15/2024 8 AM 11 Good Hangar Fenceline - N Center 10/15/2024 8 AM 12 Good Hangar Fenceline - N Corner 10/15/2024 8 AM 9 Good Hangar Fenceline - NE Corner 10/15/2024 8 AM 14 Good Hangar Fenceline - NE Side 10/15/2024 8 AM 8 Good Hangar Fenceline - S Corner 10/15/2024 8 AM 9 Good Hangar Fenceline - S Side 10/15/2024 8 AM 12 Good Hangar Fenceline - SW Corner 10/15/2024 8 AM 13 Good Hangar Fenceline - SW Side 10/15/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/15/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 10/15/2024 8 AM 10 Good Moffett and Tustin Ranch 10/15/2024 8 AM 11 Good Valencia and Armstrong 10/15/2024 8 AM 20 Good Valencia and Columbus Square 10/15/2024 8 AM 13 Good Valencia and Legacy 10/15/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 10/15/2024 8 AM 10 Good Warner Avenue 10/15/2024 8 AM 11 Good Warner and Armstrong 10/15/2024 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, October 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/16/2024 8 AM Particulate Matter 21 Level of Concern Good Hangar Fenceline - E Side 10/16/2024 8 AM 19 Good Hangar Fenceline - N Center 10/16/2024 8 AM 21 Good Hangar Fenceline - N Corner 10/16/2024 8 AM 18 Good Hangar Fenceline - NE Corner 10/16/2024 8 AM 22 Good Hangar Fenceline - NE Side 10/16/2024 8 AM 16 Good Hangar Fenceline - S Corner 10/16/2024 8 AM 16 Good Hangar Fenceline - S Side 10/16/2024 8 AM 20 Good Hangar Fenceline - SW Corner 10/16/2024 8 AM 23 Good Hangar Fenceline - SW Side 10/16/2024 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/16/2024 8 AM Particulate Matter • 16 Level of Concern Good Legacy Road 10/16/2024 8 AM 20 Good Moffett and Tustin Ranch 10/16/2024 8 AM 20 Good Valencia and Armstrong 10/16/2024 8 AM 36 Good Valencia and Columbus Square 10/16/2024 8 AM 22 Good Valencia and Legacy 10/16/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 10/16/2024 8 AM 19 Good Warner Avenue 10/16/2024 8 AM 19 Good Warner and Armstrong 10/16/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, October 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/17/2024 8 AM Particulate Matter 22 Level of Concern Good Hangar Fenceline - E Side 10/17/2024 8 AM 21 Good Hangar Fenceline - N Center 10/17/2024 8 AM 23 Good Hangar Fenceline - N Corner 10/17/2024 8 AM 21 Good Hangar Fenceline - NE Corner 10/17/2024 8 AM 23 Good Hangar Fenceline - NE Side 10/17/2024 8 AM 17 Good Hangar Fenceline - S Corner 10/17/2024 8 AM 17 Good Hangar Fenceline - S Side 10/17/2024 8 AM 22 Good Hangar Fenceline - SW Corner 10/17/2024 8 AM 25 Good Hangar Fenceline - SW Side 10/17/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/17/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 10/17/2024 8 AM 22 Good Moffett and Tustin Ranch 10/17/2024 8 AM 23 Good Valencia and Armstrong 10/17/2024 8 AM 36 Good Valencia and Columbus Square 10/17/2024 8 AM 23 Good Valencia and Legacy 10/17/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 10/17/2024 8 AM 22 Good Warner Avenue 10/17/2024 8 AM 19 Good Warner and Armstrong 10/17/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, October 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/18/2024 8 AM Particulate Matter 15 Level of Concern Good Hangar Fenceline - E Side 10/18/2024 8 AM 14 Good Hangar Fenceline - N Center 10/18/2024 8 AM 17 Good Hangar Fenceline - N Corner 10/18/2024 8 AM 14 Good Hangar Fenceline - NE Corner 10/18/2024 8 AM 17 Good Hangar Fenceline - NE Side 10/18/2024 8 AM 12 Good Hangar Fenceline - S Corner 10/18/2024 8 AM 12 Good Hangar Fenceline - S Side 10/18/2024 8 AM 15 Good Hangar Fenceline - SW Corner 10/18/2024 8 AM 18 Good Hangar Fenceline - SW Side 10/18/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/18/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 10/18/2024 8 AM 15 Good Moffett and Tustin Ranch 10/18/2024 8 AM 16 Good Valencia and Armstrong 10/18/2024 8 AM 26 Good Valencia and Columbus Square 10/18/2024 8 AM 17 Good Valencia and Legacy 10/18/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 10/18/2024 8 AM 15 Good Warner Avenue 10/18/2024 8 AM 14 Good Warner and Armstrong 10/18/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, October 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy ML(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfuntion Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/19/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 10/19/2024 8 AM 13 Good Hangar Fenceline - N Center 10/19/2024 8 AM 15 Good Hangar Fenceline - N Corner 10/19/2024 8 AM 14 Good Hangar Fenceline - NE Corner 10/19/2024 8 AM 16 Good Hangar Fenceline - NE Side 10/19/2024 8 AM 12 Good Hangar Fenceline - S Corner 10/19/2024 8 AM 11 Good Hangar Fenceline - S Side 10/19/2024 8 AM 15 Good Hangar Fenceline - SW Corner 10/19/2024 8 AM 17 Good Hangar Fenceline - SW Side 10/19/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/19/2024 8 AM Particulate Matter • 9 Level of Concern Good Legacy Road 10/19/2024 8 AM 12 Good Moffett and Tustin Ranch 10/19/2024 8 AM 14 Good Valencia and Armstrong 10/19/2024 8 AM 30 Good Valencia and Columbus Square 10/19/2024 8 AM ** ** Valencia and Legacy 10/19/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 10/19/2024 8 AM 13 Good Warner Avenue 10/19/2024 8 AM 13 Good Warner and Armstrong 10/19/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Sunday, October 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/20/2024 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 10/20/2024 8 AM 12 Good Hangar Fenceline - N Center 10/20/2024 8 AM 14 Good Hangar Fenceline - N Corner 10/20/2024 8 AM 17 Good Hangar Fenceline - NE Corner 10/20/2024 8 AM ** ** Hangar Fenceline - NE Side 10/20/2024 8 AM 11 Good Hangar Fenceline - S Corner 10/20/2024 8 AM 10 Good Hangar Fenceline - S Side 10/20/2024 8 AM 16 Good Hangar Fenceline - SW Corner 10/20/2024 8 AM 16 Good Hangar Fenceline - SW Side 10/20/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/20/2024 8 AM Particulate Matter • 9 Level of Concern Good Legacy Road 10/20/2024 8 AM 10 Good Moffett and Tustin Ranch 10/20/2024 8 AM 13 Good Valencia and Armstrong 10/20/2024 8 AM 31 Good Valencia and Columbus Square 10/20/2024 8 AM 13 Good Valencia and Legacy 10/20/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 10/20/2024 8 AM 14 Good Warner Avenue 10/20/2024 8 AM 13 Good Warner and Armstrong 10/20/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Monday, October 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/21/2024 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 10/21/2024 8 AM 11 Good Hangar Fenceline - N Center 10/21/2024 8 AM 14 Good Hangar Fenceline - N Corner 10/21/2024 8 AM 15 Good Hangar Fenceline - NE Corner 10/21/2024 8 AM 19 Good Hangar Fenceline - NE Side 10/21/2024 8 AM 11 Good Hangar Fenceline - S Corner 10/21/2024 8 AM 11 Good Hangar Fenceline - S Side 10/21/2024 8 AM 15 Good Hangar Fenceline - SW Corner 10/21/2024 8 AM 15 Good Hangar Fenceline - SW Side 10/21/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/21/2024 8 AM Particulate Matter • 7 Level of Concern Good Legacy Road 10/21/2024 8 AM ** ** Moffett and Tustin Ranch 10/21/2024 8 AM 14 Good Valencia and Armstrong 10/21/2024 8 AM 31 Good Valencia and Columbus Square 10/21/2024 8 AM ** ** Valencia and Legacy 10/21/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 10/21/2024 8 AM ** ** Warner Avenue 10/21/2024 8 AM 13 Good Warner and Armstrong 10/21/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Tuesday, October 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/22/2024 8 AM Particulate Matter 13 Level of Concern Good Hangar Fenceline - E Side 10/22/2024 8 AM 15 Good Hangar Fenceline - N Center 10/22/2024 8 AM 17 Good Hangar Fenceline - N Corner 10/22/2024 8 AM 12 Good Hangar Fenceline - NE Corner 10/22/2024 8 AM 18 Good Hangar Fenceline - NE Side 10/22/2024 8 AM 13 Good Hangar Fenceline - S Corner 10/22/2024 8 AM 12 Good Hangar Fenceline - S Side 10/22/2024 8 AM 16 Good Hangar Fenceline - SW Corner 10/22/2024 8 AM 19 Good Hangar Fenceline - SW Side 10/22/2024 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/22/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 10/22/2024 8 AM 14 Good Moffett and Tustin Ranch 10/22/2024 8 AM 15 Good Valencia and Armstrong 10/22/2024 8 AM 32 Good Valencia and Columbus Square 10/22/2024 8 AM 14 Good Valencia and Legacy 10/22/2024 8 AM 18 Good Victory and Tustin Ranch Rd. 10/22/2024 8 AM 16 Good Warner Avenue 10/22/2024 8 AM 15 Good Warner and Armstrong 10/22/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Wednesday, October 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 10/23/2024 8 AM Particulate Matter 18 Level of Concern Good Hangar Fenceline - E Side 10/23/2024 8 AM 20 Good Hangar Fenceline - N Center 10/23/2024 8 AM 21 Good Hangar Fenceline - N Corner 10/23/2024 8 AM 9 Good Hangar Fenceline - NE Corner 10/23/2024 8 AM 23 Good Hangar Fenceline - NE Side 10/23/2024 8 AM 17 Good Hangar Fenceline - S Corner 10/23/2024 8 AM 16 Good Hangar Fenceline - S Side 10/23/2024 8 AM 23 Good Hangar Fenceline - SW Corner 10/23/2024 8 AM 25 Good Hangar Fenceline - SW Side 10/23/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/23/2024 8 AM Particulate Matter • 13 Level of Concern Good Legacy Road 10/23/2024 8 AM 19 Good Moffett and Tustin Ranch 10/23/2024 8 AM 18 Good Valencia and Armstrong 10/23/2024 8 AM 42 Good Valencia and Columbus Square 10/23/2024 8 AM 21 Good Valencia and Legacy 10/23/2024 8 AM 24 Good Victory and Tustin Ranch Rd. 10/23/2024 8 AM 20 Good Warner Avenue 10/23/2024 8 AM 19 Good Warner and Armstrong 10/23/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Thursday, October 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/24/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 10/24/2024 8 AM ** ** Hangar Fenceline - N Center 10/24/2024 8 AM 19 Good Hangar Fenceline - N Corner 10/24/2024 8 AM 9 Good Hangar Fenceline - NE Corner 10/24/2024 8 AM 19 Good Hangar Fenceline - NE Side 10/24/2024 8 AM 14 Good Hangar Fenceline - S Corner 10/24/2024 8 AM 14 Good Hangar Fenceline - S Side 10/24/2024 8 AM 21 Good Hangar Fenceline - SW Corner 10/24/2024 8 AM 22 Good Hangar Fenceline - SW Side 10/24/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/24/2024 8 AM Particulate Matter • 12 Level of Concern Good Legacy Road 10/24/2024 8 AM ** ** Moffett and Tustin Ranch 10/24/2024 8 AM 17 Good Valencia and Armstrong 10/24/2024 8 AM 35 Good Valencia and Columbus Square 10/24/2024 8 AM 18 Good Valencia and Legacy 10/24/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 10/24/2024 8 AM 19 Good Warner Avenue 10/24/2024 8 AM 18 Good Warner and Armstrong 10/24/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Friday, October 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/25/2024 8 AM Matter 23 Level of Concern Good Hangar Fenceline - E Side 10/25/2024 8 AM 23 Good Hangar Fenceline - N Center 10/25/2024 8 AM 28 Good Hangar Fenceline - N Corner 10/25/2024 8 AM 10 Good Hangar Fenceline - NE Corner 10/25/2024 8 AM 26 Good Hangar Fenceline - NE Side 10/25/2024 8 AM 18 Good Hangar Fenceline - S Corner 10/25/2024 8 AM 17 Good Hangar Fenceline - S Side 10/25/2024 8 AM 24 Good Hangar Fenceline - SW Corner 10/25/2024 8 AM 33 Good Hangar Fenceline - SW Side 10/25/2024 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/25/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 10/25/2024 8 AM ** ** Moffett and Tustin Ranch 10/25/2024 8 AM 22 Good Valencia and Armstrong 10/25/2024 8 AM 40 Good Valencia and Columbus Square 10/25/2024 8 AM 25 Good Valencia and Legacy 10/25/2024 8 AM 23 Good Victory and Tustin Ranch Rd. 10/25/2024 8 AM 22 Good Warner Avenue 10/25/2024 8 AM 24 Good Warner and Armstrong 10/25/2024 8 AM 26 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. oon Hazardous 425 to 504 Health warning of emergency conditions: ever. . - likely • be affected. Saturday, October 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/26/2024 8 AM Matter • ** Level of Concern ** Hangar Fenceline - E Side 10/26/2024 8 AM 33 Good Hangar Fenceline - N Center 10/26/2024 8 AM 42 Good Hangar Fenceline - N Corner 10/26/2024 8 AM 19 Good Hangar Fenceline - NE Corner 10/26/2024 8 AM 38 Good Hangar Fenceline - NE Side 10/26/2024 8 AM 25 Good Hangar Fenceline - S Corner 10/26/2024 8 AM 24 Good Hangar Fenceline - S Side 10/26/2024 8 AM 32 Good Hangar Fenceline - SW Corner 10/26/2024 8 AM 44 Good Hangar Fenceline - SW Side 10/26/2024 8 AM 30 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/26/2024 8 AM Particulate Matter • 30 Level of Concern Good Legacy Road 10/26/2024 8 AM ** ** Moffett and Tustin Ranch 10/26/2024 8 AM 32 Good Valencia and Armstrong 10/26/2024 8 AM 54 Good Valencia and Columbus Square 10/26/2024 8 AM 36 Good Valencia and Legacy 10/26/2024 8 AM 34 Good Victory and Tustin Ranch Rd. 10/26/2024 8 AM ** ** Warner Avenue 10/26/2024 8 AM 32 Good Warner and Armstrong 10/26/2024 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e cts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Sunday, October 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/27/2024 8 AM Matter • 54 Level of Concern Good Hangar Fenceline - E Side 10/27/2024 8 AM 53 Good Hangar Fenceline - N Center 10/27/2024 8 AM 60 Moderate Hangar Fenceline - N Corner 10/27/2024 8 AM 36 Good Hangar Fenceline - NE Corner 10/27/2024 8 AM 59 Moderate Hangar Fenceline - NE Side 10/27/2024 8 AM 39 Good Hangar Fenceline - S Corner 10/27/2024 8 AM 38 Good Hangar Fenceline - S Side 10/27/2024 8 AM 51 Good Hangar Fenceline - SW Corner 10/27/2024 8 AM 66 Moderate Hangar Fenceline - SW Side 10/27/2024 8 AM 48 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/27/2024 8 AM Particulate Matter • 46 Level of Concern Good Legacy Road 10/27/2024 8 AM 57 Moderate Moffett and Tustin Ranch 10/27/2024 8 AM 48 Good Valencia and Armstrong 10/27/2024 8 AM 91 Moderate Valencia and Columbus Square 10/27/2024 8 AM 56 Moderate Valencia and Legacy 10/27/2024 8 AM 52 Good Victory and Tustin Ranch Rd. 10/27/2024 8 AM — ** Warner Avenue 10/27/2024 8 AM 53 Good Warner and Armstrong 10/27/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Monday, October 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/28/2024 8 AM Matter • 24 Level of Concern Good Hangar Fenceline - E Side 10/28/2024 8 AM 24 Good Hangar Fenceline - N Center 10/28/2024 8 AM 26 Good Hangar Fenceline - N Corner 10/28/2024 8 AM 17 Good Hangar Fenceline - NE Corner 10/28/2024 8 AM 30 Good Hangar Fenceline - NE Side 10/28/2024 8 AM 18 Good Hangar Fenceline - S Corner 10/28/2024 8 AM 19 Good Hangar Fenceline - S Side 10/28/2024 8 AM 25 Good Hangar Fenceline - SW Corner 10/28/2024 8 AM 31 Good Hangar Fenceline - SW Side 10/28/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/28/2024 8 AM Particulate Matter • 18 Level of Concern Good Legacy Road 10/28/2024 8 AM 27 Good Moffett and Tustin Ranch 10/28/2024 8 AM 24 Good Valencia and Armstrong 10/28/2024 8 AM 42 Good Valencia and Columbus Square 10/28/2024 8 AM 26 Good Valencia and Legacy 10/28/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 10/28/2024 8 AM 28 ** Warner Avenue 10/28/2024 8 AM 24 Good Warner and Armstrong 10/28/2024 8 AM — ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Tuesday, October 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/29/2024 8 AM Matter • 13 Level of Concern Good Hangar Fenceline - E Side 10/29/2024 8 AM 13 Good Hangar Fenceline - N Center 10/29/2024 8 AM 16 Good Hangar Fenceline - N Corner 10/29/2024 8 AM ** ** Hangar Fenceline - NE Corner 10/29/2024 8 AM 14 Good Hangar Fenceline - NE Side 10/29/2024 8 AM 10 Good Hangar Fenceline - S Corner 10/29/2024 8 AM 7 Good Hangar Fenceline - S Side 10/29/2024 8 AM 13 Good Hangar Fenceline - SW Corner 10/29/2024 8 AM 17 Good Hangar Fenceline - SW Side 10/29/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/29/2024 8 AM Particulate Matter • 7 Level of Concern Good Legacy Road 10/29/2024 8 AM 14 Good Moffett and Tustin Ranch 10/29/2024 8 AM 10 Good Valencia and Armstrong 10/29/2024 8 AM 19 Good Valencia and Columbus Square 10/29/2024 8 AM 14 Good Valencia and Legacy 10/29/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 10/29/2024 8 AM — ** Warner Avenue 10/29/2024 8 AM 12 Good Warner and Armstrong 10/29/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Wednesday, October 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/30/2024 8 AM Matter • 9 Level of Concern Good Hangar Fenceline - E Side 10/30/2024 8 AM 10 Good Hangar Fenceline - N Center 10/30/2024 8 AM 11 Good Hangar Fenceline - N Corner 10/30/2024 8 AM ** ** Hangar Fenceline - NE Corner 10/30/2024 8 AM 13 Good Hangar Fenceline - NE Side 10/30/2024 8 AM 8 Good Hangar Fenceline - S Corner 10/30/2024 8 AM 7 Good Hangar Fenceline - S Side 10/30/2024 8 AM 10 Good Hangar Fenceline - SW Corner 10/30/2024 8 AM 12 Good Hangar Fenceline - SW Side 10/30/2024 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/30/2024 8 AM Particulate Matter • 5 Level of Concern Good Legacy Road 10/30/2024 8 AM Moffett and Tustin Ranch 10/30/2024 8 AM 8 Good Valencia and Armstrong 10/30/2024 8 AM 22 Good Valencia and Columbus Square 10/30/2024 8 AM 11 Good Valencia and Legacy 10/30/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 10/30/2024 8 AM 11 Good Warner Avenue 10/30/2024 8 AM 9 Good Warner and Armstrong 10/30/2024 8 AM` Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Mq Hazardous 425 to 504 Health warning of emergency conditions: ever• • - likely • be affected. Thursday, October 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 10/31/2024 8 AM Matter • 9 Level of Concern Good Hangar Fenceline - E Side 10/31/2024 8 AM 11 Good Hangar Fenceline - N Center 10/31/2024 8 AM 12 Good Hangar Fenceline - N Corner 10/31/2024 8 AM 8 Good Hangar Fenceline - NE Corner 10/31/2024 8 AM 13 Good Hangar Fenceline - NE Side 10/31/2024 8 AM 9 Good Hangar Fenceline - S Corner 10/31/2024 8 AM 9 Good Hangar Fenceline - S Side 10/31/2024 8 AM 13 Good Hangar Fenceline - SW Corner 10/31/2024 8 AM 14 Good Hangar Fenceline - SW Side 10/31/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 10/31/2024 8 AM Particulate Matter • 6 Level of Concern Good Legacy Road 10/31/2024 8 AM 12 Good Moffett and Tustin Ranch 10/31/2024 8 AM 9 Good Valencia and Armstrong 10/31/2024 8 AM 25 Good Valencia and Columbus Square 10/31/2024 8 AM 12 Good Valencia and Legacy 10/31/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 10/31/2024 8 AM 13 Good Warner Avenue 10/31/2024 8 AM 11 Good Warner and Armstrong 10/31/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Friday, November 1, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/01/2024 8 AM Matter • 11 Level of Concern Good Hangar Fenceline - E Side 11/01/2024 8 AM 12 Good Hangar Fenceline - N Center 11/01/2024 8 AM 12 Good Hangar Fenceline - N Corner 11/01/2024 8 AM 8 Good Hangar Fenceline - NE Corner 11/01/2024 8 AM 14 Good Hangar Fenceline - NE Side 11/01/2024 8 AM 10 Good Hangar Fenceline - S Corner 11/01/2024 8 AM 10 Good Hangar Fenceline - S Side 11/01/2024 8 AM 13 Good Hangar Fenceline - SW Corner 11/01/2024 8 AM 14 Good Hangar Fenceline - SW Side 11/01/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/01/2024 8 AM Particulate Matter • 7 Level of Concern Good Legacy Road 11/01/2024 8 AM 13 Good Moffett and Tustin Ranch 11/01/2024 8 AM 11 Good Valencia and Armstrong 11/01/2024 8 AM 26 Good Valencia and Columbus Square 11/01/2024 8 AM 13 Good Valencia and Legacy 11/01/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 11/01/2024 8 AM 15 Good Warner Avenue 11/01/2024 8 AM 13 Good Warner and Armstrong 11/01/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, November 2, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/02/2024 8 AM Matter • ** Level of Concern ** Hangar Fenceline - E Side 11/02/2024 8 AM 18 Good Hangar Fenceline - N Center 11/02/2024 8 AM 20 Good Hangar Fenceline - N Corner 11/02/2024 8 AM 13 Good Hangar Fenceline - NE Corner 11/02/2024 8 AM 22 Good Hangar Fenceline - NE Side 11/02/2024 8 AM 15 Good Hangar Fenceline - S Corner 11/02/2024 8 AM 16 Good Hangar Fenceline - S Side 11/02/2024 8 AM 21 Good Hangar Fenceline - SW Corner 11/02/2024 8 AM 23 Good Hangar Fenceline - SW Side 11/02/2024 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/02/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 11/02/2024 8 AM 19 Good Moffett and Tustin Ranch 11/02/2024 8 AM 16 Good Valencia and Armstrong 11/02/2024 8 AM 36 Good Valencia and Columbus Square 11/02/2024 8 AM 21 Good Valencia and Legacy 11/02/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 11/02/2024 8 AM 22 Good Warner Avenue 11/02/2024 8 AM ** ** Warner and Armstrong 11/02/2024 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Mq Hazardous 425 to 504 Health warning of emergency conditions: ever• • - likely • be affected. Sunday, November 3, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/03/2024 8 AM Matter • 11 Level of Concern Good Hangar Fenceline - E Side 11/03/2024 8 AM 12 Good Hangar Fenceline - N Center 11/03/2024 8 AM 13 Good Hangar Fenceline - N Corner 11/03/2024 8 AM 8 Good Hangar Fenceline - NE Corner 11/03/2024 8 AM 14 Good Hangar Fenceline - NE Side 11/03/2024 8 AM 9 Good Hangar Fenceline - S Corner 11/03/2024 8 AM 9 Good Hangar Fenceline - S Side 11/03/2024 8 AM 12 Good Hangar Fenceline - SW Corner 11/03/2024 8 AM 15 Good Hangar Fenceline - SW Side 11/03/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/03/2024 8 AM Particulate Matter • 8 Level of Concern Good Legacy Road 11/03/2024 8 AM 13 Good Moffett and Tustin Ranch 11/03/2024 8 AM 9 Good Valencia and Armstrong 11/03/2024 8 AM 21 Good Valencia and Columbus Square 11/03/2024 8 AM 13 Good Valencia and Legacy 11/03/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 11/03/2024 8 AM ** ** Warner Avenue 11/03/2024 8 AM 11 Good Warner and Armstrong 11/03/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Mq Hazardous 425 to 504 Health warning of emergency conditions: ever• • - likely • be affected. Monday, November 4, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/04/2024 8 AM Matter • 10 Level of Concern Good Hangar Fenceline - E Side 11/04/2024 8 AM 11 Good Hangar Fenceline - N Center 11/04/2024 8 AM 11 Good Hangar Fenceline - N Corner 11/04/2024 8 AM 7 Good Hangar Fenceline - NE Corner 11/04/2024 8 AM 12 Good Hangar Fenceline - NE Side 11/04/2024 8 AM 8 Good Hangar Fenceline - S Corner 11/04/2024 8 AM 8 Good Hangar Fenceline - S Side 11/04/2024 8 AM 12 Good Hangar Fenceline - SW Corner 11/04/2024 8 AM 11 Good Hangar Fenceline - SW Side 11/04/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/04/2024 8 AM Particulate Matter • 5 Level of Concern Good Legacy Road 11/04/2024 8 AM 10 Good Moffett and Tustin Ranch 11/04/2024 8 AM 10 Good Valencia and Armstrong 11/04/2024 8 AM 23 Good Valencia and Columbus Square 11/04/2024 8 AM 11 Good Valencia and Legacy 11/04/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 11/04/2024 8 AM 13 Good Warner Avenue 11/04/2024 8 AM 11 Good Warner and Armstrong 11/04/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Tuesday, November 5, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/05/2024 8 AM Matter • 8 Level of Concern Good Hangar Fenceline - E Side 11/05/2024 8 AM 7 Good Hangar Fenceline - N Center 11/05/2024 8 AM 8 Good Hangar Fenceline - N Corner 11/05/2024 8 AM 4 Good Hangar Fenceline - NE Corner 11/05/2024 8 AM 4 Good Hangar Fenceline - NE Side 11/05/2024 8 AM 7 Good Hangar Fenceline - S Corner 11/05/2024 8 AM 5 Good Hangar Fenceline - S Side 11/05/2024 8 AM 9 Good Hangar Fenceline - SW Corner 11/05/2024 8 AM 7 Good Hangar Fenceline - SW Side 11/05/2024 8 AM 5 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/05/2024 8 AM Particulate Matter • ** Level of Concern ** Legacy Road 11/05/2024 8 AM 5 Good Moffett and Tustin Ranch 11/05/2024 8 AM 7 Good Valencia and Armstrong 11/05/2024 8 AM 14 Good Valencia and Columbus Square 11/05/2024 8 AM 4 Good Valencia and Legacy 11/05/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 11/05/2024 8 AM 10 Good Warner Avenue 11/05/2024 8 AM 6 Good Warner and Armstrong 11/05/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Mq Hazardous 425 to 504 Health warning of emergency conditions: ever• • - likely • be affected. Wednesday, November 6, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/06/2024 8 AM Matter • 12 Level of Concern Good Hangar Fenceline - E Side 11/06/2024 8 AM 15 Good Hangar Fenceline - N Center 11/06/2024 8 AM 14 Good Hangar Fenceline - N Corner 11/06/2024 8 AM 10 Good Hangar Fenceline - NE Corner 11/06/2024 8 AM 13 Good Hangar Fenceline - NE Side 11/06/2024 8 AM 11 Good Hangar Fenceline - S Corner 11/06/2024 8 AM 9 Good Hangar Fenceline - S Side 11/06/2024 8 AM 14 Good Hangar Fenceline - SW Corner 11/06/2024 8 AM 13 Good Hangar Fenceline - SW Side 11/06/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/06/2024 8 AM Particulate Matter • 5 Level of Concern Good Legacy Road 11/06/2024 8 AM ** ** Moffett and Tustin Ranch 11/06/2024 8 AM 11 Good Valencia and Armstrong 11/06/2024 8 AM 25 Good Valencia and Columbus Square 11/06/2024 8 AM 15 Good Valencia and Legacy 11/06/2024 8 AM 23 Good Victory and Tustin Ranch Rd. 11/06/2024 8 AM 15 Good Warner Avenue 11/06/2024 8 AM 13 Good Warner and Armstrong 11/06/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Mq Hazardous 425 to 504 Health warning of emergency conditions: ever• • - likely • be affected. Thursday, November 7, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/07/2024 8 AM Matter • 7 Level of Concern Good Hangar Fenceline - E Side 11/07/2024 8 AM 15 Good Hangar Fenceline - N Center 11/07/2024 8 AM 8 Good Hangar Fenceline - N Corner 11/07/2024 8 AM 7 Good Hangar Fenceline - NE Corner 11/07/2024 8 AM 6 Good Hangar Fenceline - NE Side 11/07/2024 8 AM 9 Good Hangar Fenceline - S Corner 11/07/2024 8 AM ** ** Hangar Fenceline - S Side 11/07/2024 8 AM 9 Good Hangar Fenceline - SW Corner 11/07/2024 8 AM 8 Good Hangar Fenceline - SW Side 11/07/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/07/2024 8 AM Particulate Matter • 4 Level of Concern Good Legacy Road 11/07/2024 8 AM 4 Good Moffett and Tustin Ranch 11/07/2024 8 AM ** ** Valencia and Armstrong 11/07/2024 8 AM 17 Good Valencia and Columbus Square 11/07/2024 8 AM 5 Good Valencia and Legacy 11/07/2024 8 AM 8 Good Victory and Tustin Ranch Rd. 11/07/2024 8 AM 8 Good Warner Avenue 11/07/2024 8 AM 12 Good Warner and Armstrong 11/07/2024 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Friday, November 8, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/08/2024 8 AM Matter • 9 Level of Concern Good Hangar Fenceline - E Side 11/08/2024 8 AM 10 Good Hangar Fenceline - N Center 11/08/2024 8 AM 11 Good Hangar Fenceline - N Corner 11/08/2024 8 AM 6 Good Hangar Fenceline - NE Corner 11/08/2024 8 AM 7 Good Hangar Fenceline - NE Side 11/08/2024 8 AM 10 Good Hangar Fenceline - S Corner 11/08/2024 8 AM 7 Good Hangar Fenceline - S Side 11/08/2024 8 AM 11 Good Hangar Fenceline - SW Corner 11/08/2024 8 AM 9 Good Hangar Fenceline - SW Side 11/08/2024 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/08/2024 8 AM Particulate Matter • 7 Level of Concern Good Legacy Road 11/08/2024 8 AM ** ** Moffett and Tustin Ranch 11/08/2024 8 AM 10 Good Valencia and Armstrong 11/08/2024 8 AM 15 Good Valencia and Columbus Square 11/08/2024 8 AM 5 Good Valencia and Legacy 11/08/2024 8 AM 9 Good Victory and Tustin Ranch Rd. 11/08/2024 8 AM 11 Good Warner Avenue 11/08/2024 8 AM 8 Good Warner and Armstrong 11/08/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, November 9, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/09/2024 8 AM Matter • 12 Level of Concern Good Hangar Fenceline - E Side 11/09/2024 8 AM 14 Good Hangar Fenceline - N Center 11/09/2024 8 AM 13 Good Hangar Fenceline - N Corner 11/09/2024 8 AM 10 Good Hangar Fenceline - NE Corner 11/09/2024 8 AM 15 Good Hangar Fenceline - NE Side 11/09/2024 8 AM 9 Good Hangar Fenceline - S Corner 11/09/2024 8 AM 11 Good Hangar Fenceline - S Side 11/09/2024 8 AM 15 Good Hangar Fenceline - SW Corner 11/09/2024 8 AM 14 Good Hangar Fenceline - SW Side 11/09/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/09/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 11/09/2024 8 AM 10 Good Moffett and Tustin Ranch 11/09/2024 8 AM 11 Good Valencia and Armstrong 11/09/2024 8 AM 23 Good Valencia and Columbus Square 11/09/2024 8 AM 11 Good Valencia and Legacy 11/09/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 11/09/2024 8 AM 16 Good Warner Avenue 11/09/2024 8 AM 13 Good Warner and Armstrong 11/09/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Sunday, November 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/10/2024 8 AM Matter • ** Level of Concern ** Hangar Fenceline - E Side 11/10/2024 8 AM 26 Good Hangar Fenceline - N Center 11/10/2024 8 AM 24 Good Hangar Fenceline - N Corner 11/10/2024 8 AM 22 Good Hangar Fenceline - NE Corner 11/10/2024 8 AM 33 Good Hangar Fenceline - NE Side 11/10/2024 8 AM 20 Good Hangar Fenceline - S Corner 11/10/2024 8 AM 22 Good Hangar Fenceline - S Side 11/10/2024 8 AM 27 Good Hangar Fenceline - SW Corner 11/10/2024 8 AM 27 Good Hangar Fenceline - SW Side 11/10/2024 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/10/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 11/10/2024 8 AM 21 Good Moffett and Tustin Ranch 11/10/2024 8 AM 21 Good Valencia and Armstrong 11/10/2024 8 AM 43 Good Valencia and Columbus Square 11/10/2024 8 AM 25 Good Valencia and Legacy 11/10/2024 8 AM 27 Good Victory and Tustin Ranch Rd. 11/10/2024 8 AM 31 Good Warner Avenue 11/10/2024 8 AM 24 Good Warner and Armstrong 11/10/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Monday, November 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/11/2024 8 AM Matter • 37 Level of Concern Good Hangar Fenceline - E Side 11/11/2024 8 AM 37 Good Hangar Fenceline - N Center 11/11/2024 8 AM 36 Good Hangar Fenceline - N Corner 11/11/2024 8 AM ** ** Hangar Fenceline - NE Corner 11/11/2024 8 AM 46 Good Hangar Fenceline - NE Side 11/11/2024 8 AM 30 Good Hangar Fenceline - S Corner 11/11/2024 8 AM 31 Good Hangar Fenceline - S Side 11/11/2024 8 AM 39 Good Hangar Fenceline - SW Corner 11/11/2024 8 AM 41 Good Hangar Fenceline - SW Side 11/11/2024 8 AM 31 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/11/2024 8 AM Particulate Matter • 33 Level of Concern Good Legacy Road 11/11/2024 8 AM 32 Good Moffett and Tustin Ranch 11/11/2024 8 AM 31 Good Valencia and Armstrong 11/11/2024 8 AM 62 Moderate Valencia and Columbus Square 11/11/2024 8 AM 40 Good Valencia and Legacy 11/11/2024 8 AM 37 Good Victory and Tustin Ranch Rd. 11/11/2024 8 AM 44 Good Warner Avenue 11/11/2024 8 AM 33 Good Warner and Armstrong 11/11/2024 8 AM 33 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Tuesday, November 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/12/2024 8 AM Matter • 25 Level of Concern Good Hangar Fenceline - E Side 11/12/2024 8 AM 28 Good Hangar Fenceline - N Center 11/12/2024 8 AM 29 Good Hangar Fenceline - N Corner 11/12/2024 8 AM 21 Good Hangar Fenceline - NE Corner 11/12/2024 8 AM 39 Good Hangar Fenceline - NE Side 11/12/2024 8 AM 23 Good Hangar Fenceline - S Corner 11/12/2024 8 AM ** ** Hangar Fenceline - S Side 11/12/2024 8 AM 30 Good Hangar Fenceline - SW Corner 11/12/2024 8 AM 33 Good Hangar Fenceline - SW Side 11/12/2024 8 AM 25 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/12/2024 8 AM Particulate Matter • ** Level of Concern ** Legacy Road 11/12/2024 8 AM 24 Good Moffett and Tustin Ranch 11/12/2024 8 AM 22 Good Valencia and Armstrong 11/12/2024 8 AM 49 Good Valencia and Columbus Square 11/12/2024 8 AM 32 Good Valencia and Legacy 11/12/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 11/12/2024 8 AM 32 Good Warner Avenue 11/12/2024 8 AM 26 Good Warner and Armstrong 11/12/2024 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Wednesday, November 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/13/2024 8 AM Matter • 13 Level of Concern Good Hangar Fenceline - E Side 11/13/2024 8 AM 15 Good Hangar Fenceline - N Center 11/13/2024 8 AM 14 Good Hangar Fenceline - N Corner 11/13/2024 8 AM 11 Good Hangar Fenceline - NE Corner 11/13/2024 8 AM 18 Good Hangar Fenceline - NE Side 11/13/2024 8 AM 11 Good Hangar Fenceline - S Corner 11/13/2024 8 AM ** ** Hangar Fenceline - S Side 11/13/2024 8 AM 15 Good Hangar Fenceline - SW Corner 11/13/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - SW Side Period • • 11/13/2024 8 AM Particulate Matter • 10 Level of Concern Good Hangar Fenceline - W Side 11/13/2024 8 AM ** ** Legacy Road 11/13/2024 8 AM 11 Good Moffett and Tustin Ranch 11/13/2024 8 AM 11 Good Valencia and Armstrong 11/13/2024 8 AM 23 Good Valencia and Columbus Square 11/13/2024 8 AM 12 Good Valencia and Legacy 11/13/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 11/13/2024 8 AM 17 Good Warner Avenue 11/13/2024 8 AM 12 Good Warner and Armstrong 11/13/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health -ftorts is increased for everyone. Haza;r�O—US7 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Thursday, November 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/14/2024 8 AM Matter • 11 Level of Concern Good Hangar Fenceline - E Side 11/14/2024 8 AM 12 Good Hangar Fenceline - N Center 11/14/2024 8 AM 11 Good Hangar Fenceline - N Corner 11/14/2024 8 AM 10 Good Hangar Fenceline - NE Corner 11/14/2024 8 AM 17 Good Hangar Fenceline - NE Side 11/14/2024 8 AM 10 Good Hangar Fenceline - S Corner 11/14/2024 8 AM 10 Good Hangar Fenceline - S Side 11/14/2024 8 AM 12 Good Hangar Fenceline - SW Corner 11/14/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - SW Side Period • • 11/14/2024 8 AM Particulate Matter • 8 Level of Concern Good Hangar Fenceline - W Side 11/14/2024 8 AM ** ** Legacy Road 11/14/2024 8 AM 10 Good Moffett and Tustin Ranch 11/14/2024 8 AM 8 Good Valencia and Armstrong 11/14/2024 8 AM 22 Good Valencia and Columbus Square 11/14/2024 8 AM 11 Good Valencia and Legacy 11/14/2024 8 AM 13 Good Victory and Tustin Ranch Rd. 11/14/2024 8 AM 13 Good Warner Avenue 11/14/2024 8 AM 11 Good Warner and Armstrong 11/14/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health e is is increased for everyone Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely r to be affected. Friday, November 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/15/2024 8 AM Matter • 11 Level of Concern Good Hangar Fenceline - E Side 11/15/2024 8 AM 13 Good Hangar Fenceline - N Center 11/15/2024 8 AM 14 Good Hangar Fenceline - N Corner 11/15/2024 8 AM ** ** Hangar Fenceline - NE Corner 11/15/2024 8 AM 20 Good Hangar Fenceline - NE Side 11/15/2024 8 AM 10 Good Hangar Fenceline - S Corner 11/15/2024 8 AM 10 Good Hangar Fenceline - S Side 11/15/2024 8 AM 14 Good Hangar Fenceline - SW Corner 11/15/2024 8 AM 15 Good Hangar Fenceline - SW Side 11/15/2024 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/15/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 11/15/2024 8 AM 10 Good Moffett and Tustin Ranch 11/15/2024 8 AM 6 Good Valencia and Armstrong 11/15/2024 8 AM 21 Good Valencia and Columbus Square 11/15/2024 8 AM 15 Good Valencia and Legacy 11/15/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 11/15/2024 8 AM 15 Good Warner Avenue 11/15/2024 8 AM 11 Good Warner and Armstrong 11/15/2024 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, November 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/16/2024 8 AM Matter • 12 Level of Concern Good Hangar Fenceline - E Side 11/16/2024 8 AM 11 Good Hangar Fenceline - N Center 11/16/2024 8 AM 13 Good Hangar Fenceline - N Corner 11/16/2024 8 AM ** ** Hangar Fenceline - NE Corner 11/16/2024 8 AM 13 Good Hangar Fenceline - NE Side 11/16/2024 8 AM 9 Good Hangar Fenceline - S Corner 11/16/2024 8 AM 7 Good Hangar Fenceline - S Side 11/16/2024 8 AM 11 Good Hangar Fenceline - SW Corner 11/16/2024 8 AM 12 Good Hangar Fenceline - SW Side 11/16/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 11/16/2024 8 AM Particulate Matter • ** Level of Concern ** Legacy Road 11/16/2024 8 AM 9 Good Moffett and Tustin Ranch 11/16/2024 8 AM ** ** Valencia and Armstrong 11/16/2024 8 AM 16 Good Valencia and Columbus Square 11/16/2024 8 AM 10 Good Valencia and Legacy 11/16/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 11/16/2024 8 AM 14 Good Warner Avenue 11/16/2024 8 AM 10 Good Warner and Armstrong 11/16/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Sunday, November 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period24-Hour Ending 11/17/2024 8 AM Particulate Matter 9 Level of Concern Good Hangar Fenceline - E Side 11/17/2024 8 AM 10 Good Hangar Fenceline - N Center 11/17/2024 8 AM 11 Good Hangar Fenceline - N Corner 11/17/2024 8 AM 9 Good Hangar Fenceline - NE Corner 11/17/2024 8 AM 14 Good Hangar Fenceline - NE Side 11/17/2024 8 AM ** ** Hangar Fenceline - S Corner 11/17/2024 8 AM 10 Good Hangar Fenceline - S Side 11/17/2024 8 AM 12 Good Hangar Fenceline - SW Corner 11/17/2024 8 AM 11 Good Hangar Fenceline - SW Side 11/17/2024 8 AM ** ** Location Hangar Fenceline - W Side 24-Hour Period Endingof 11/17/2024 8 AM 9 Concern Good Legacy Road 11/17/2024 8 AM 8 Good Moffett and Tustin Ranch 11/17/2024 8 AM 7 Good Valencia and Armstrong 11/17/2024 8 AM 19 Good Valencia and Columbus Square 11/17/2024 8 AM 10 Good Valencia and Legacy 11/17/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 11/17/2024 8 AM 12 Good Warner Avenue 11/17/2024 8 AM 10 Good Warner and Armstrong 11/17/2024 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, November 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/18/2024 8 AM Matter • 11 Level of Concern Good Hangar Fenceline - E Side 11/18/2024 8 AM 13 Good Hangar Fenceline - N Center 11/18/2024 8 AM 13 Good Hangar Fenceline - N Corner 11/18/2024 8 AM ** ** Hangar Fenceline - NE Corner 11/18/2024 8 AM 19 Good Hangar Fenceline - NE Side 11/18/2024 8 AM 10 Good Hangar Fenceline - S Corner 11/18/2024 8 AM 13 Good Hangar Fenceline - S Side 11/18/2024 8 AM 13 Good Hangar Fenceline - SW Corner 11/18/2024 8 AM ** Good Hangar Fenceline - SW Side 11/18/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/18/2024 8 AM Particulate Matter • 12 Level of Concern ** Legacy Road 11/18/2024 8 AM 11 Good Moffett and Tustin Ranch 11/18/2024 8 AM 10 ** Valencia and Armstrong 11/18/2024 8 AM 26 Good Valencia and Columbus Square 11/18/2024 8 AM 14 Good Valencia and Legacy 11/18/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 11/18/2024 8 AM 14 Good Warner Avenue 11/18/2024 8 AM 13 Good Warner and Armstrong 11/18/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Tuesday, November 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/19/2024 8 AM Matter • 17 Level of Concern Good Hangar Fenceline - E Side 11/19/2024 8 AM 16 Good Hangar Fenceline - N Center 11/19/2024 8 AM 19 Good Hangar Fenceline - N Corner 11/19/2024 8 AM ** ** Hangar Fenceline - NE Corner 11/19/2024 8 AM 22 Good Hangar Fenceline - NE Side 11/19/2024 8 AM 13 Good Hangar Fenceline - S Corner 11/19/2024 8 AM 13 Good Hangar Fenceline - S Side 11/19/2024 8 AM 15 Good Hangar Fenceline - SW Corner 11/19/2024 8 AM 20 Good Hangar Fenceline - SW Side 11/19/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/19/2024 8 AM Particulate Matter • ** Level of Concern ** Legacy Road 11/19/2024 8 AM 15 Good Moffett and Tustin Ranch 11/19/2024 8 AM 11 Good Valencia and Armstrong 11/19/2024 8 AM 24 Good Valencia and Columbus Square 11/19/2024 8 AM 17 Good Valencia and Legacy 11/19/2024 8 AM 16 Good Victory and Tustin Ranch Rd. 11/19/2024 8 AM 18 Good Warner Avenue 11/19/2024 8 AM 15 Good Warner and Armstrong 11/19/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Wednesday, November 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 11/20/2024 8 AM Matter • 24 Level of Concern Good Hangar Fenceline - E Side 11/20/2024 8 AM 26 Good Hangar Fenceline - N Center 11/20/2024 8 AM 28 Good Hangar Fenceline - N Corner 11/20/2024 8 AM 19 Good Hangar Fenceline - NE Corner 11/20/2024 8 AM 34 Good Hangar Fenceline - NE Side 11/20/2024 8 AM 21 Good Hangar Fenceline - S Corner 11/20/2024 8 AM 21 Good Hangar Fenceline - S Side 11/20/2024 8 AM 26 Good Hangar Fenceline - SW Corner 11/20/2024 8 AM 29 Good Hangar Fenceline - SW Side 11/20/2024 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 11/20/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 11/20/2024 8 AM 22 Good Moffett and Tustin Ranch 11/20/2024 8 AM 19 Good Valencia and Armstrong 11/20/2024 8 AM 37 Good Valencia and Columbus Square 11/20/2024 8 AM 28 Good Valencia and Legacy 11/20/2024 8 AM 27 Good Victory and Tustin Ranch Rd. 11/20/2024 8 AM 29 Good Warner Avenue 11/20/2024 8 AM 24 Good Warner and Armstrong 11/20/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Hazardous 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Thursday, November21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for wr Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park 24-Hour Period Ending 11/21/2024 8 AM • 23 Good Hangar Fenceline - E Side 11/21/2024 8 AM 25 Good Hangar Fenceline - N Center 11/21/2024 8 AM 26 Good Hangar Fenceline - N Corner 11/21/2024 8 AM 22 Good Hangar Fenceline - NE Corner 11/21/2024 8 AM 35 Good Hangar Fenceline - NE Side 11/21/2024 8 AM 22 Good Hangar Fenceline - S Corner 11/21/2024 8 AM 22 Good Hangar Fenceline - S Side 11/21/2024 8 AM 26 Good Hangar Fenceline - SW Corner 11/21/2024 8 AM 29 Good Hangar Fenceline - SW Side 11/21/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/21/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 11/21/2024 8 AM 22 Good Moffett and Tustin Ranch 11/21/2024 8 AM 20 Good Valencia and Armstrong 11/21/2024 8 AM 42 Good Valencia and Columbus Square 11/21/2024 8 AM 25 Good Valencia and Legacy 11/21/2024 8 AM 27 Good Victory and Tustin Ranch Rd. 11/21/2024 8 AM 31 Good Warner Avenue 11/21/2024 8 AM 24 Good Warner and Armstrong 11/21/2024 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Friday, November 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for wr Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 11/22/2024 8 AM Particulate Matter ** Level of Concern ** Hangar Fenceline - E Side 11/22/2024 8 AM 27 Good Hangar Fenceline - N Center 11/22/2024 8 AM 28 Good Hangar Fenceline - N Corner 11/22/2024 8 AM 22 Good Hangar Fenceline - NE Corner 11/22/2024 8 AM 35 Good Hangar Fenceline - NE Side 11/22/2024 8 AM ** ** Hangar Fenceline - S Corner 11/22/2024 8 AM 23 Good Hangar Fenceline - S Side 11/22/2024 8 AM 27 Good Hangar Fenceline - SW Corner 11/22/2024 8 AM 29 Good Hangar Fenceline - SW Side 11/22/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/22/2024 8 AM Particulate Matter • 23 Level of Concern Good Legacy Road 11/22/2024 8 AM 22 Good Moffett and Tustin Ranch 11/22/2024 8 AM 19 Good Valencia and Armstrong 11/22/2024 8 AM 43 Good Valencia and Columbus Square 11/22/2024 8 AM 27 Good Valencia and Legacy 11/22/2024 8 AM 27 Good Victory and Tustin Ranch Rd. 11/22/2024 8 AM 33 Good Warner Avenue 11/22/2024 8 AM 26 Good Warner and Armstrong 11/22/2024 8 AM 24 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Saturday, November 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for wr Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park Period Ending 11/23/2024 8 AM Matter • 27 Level of Concern Good Hangar Fenceline - E Side 11/23/2024 8 AM 25 Good Hangar Fenceline - N Center 11/23/2024 8 AM 28 Good Hangar Fenceline - N Corner 11/23/2024 8 AM 19 Good Hangar Fenceline - NE Corner 11/23/2024 8 AM 33 Good Hangar Fenceline - NE Side 11/23/2024 8 AM ** ** Hangar Fenceline - S Corner 11/23/2024 8 AM 20 Good Hangar Fenceline - S Side 11/23/2024 8 AM 25 Good Hangar Fenceline - SW Corner 11/23/2024 8 AM 29 Good Hangar Fenceline - SW Side 11/23/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/23/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 11/23/2024 8 AM 21 Good Moffett and Tustin Ranch 11/23/2024 8 AM 16 Good Valencia and Armstrong 11/23/2024 8 AM 38 Good Valencia and Columbus Square 11/23/2024 8 AM 25 Good Valencia and Legacy 11/23/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 11/23/2024 8 AM 29 Good Warner Avenue 11/23/2024 8 AM 23 Good Warner and Armstrong 11/23/2024 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Sunday, November 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for 5P Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park Period Ending 11/24/2024 8 AM Matter • 20 Level of Concern Good Hangar Fenceline - E Side 11/24/2024 8 AM 15 Good Hangar Fenceline - N Center 11/24/2024 8 AM 16 Good Hangar Fenceline - N Corner 11/24/2024 8 AM 12 Good Hangar Fenceline - NE Corner 11/24/2024 8 AM 21 Good Hangar Fenceline - NE Side 11/24/2024 8 AM ** ** Hangar Fenceline - S Corner 11/24/2024 8 AM 13 Good Hangar Fenceline - S Side 11/24/2024 8 AM 15 Good Hangar Fenceline - SW Corner 11/24/2024 8 AM 19 Good Hangar Fenceline - SW Side 11/24/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/24/2024 8 AM Particulate Matter • 14 Level of Concern Good Legacy Road 11/24/2024 8 AM 14 Good Moffett and Tustin Ranch 11/24/2024 8 AM 10 Good Valencia and Armstrong 11/24/2024 8 AM 24 Good Valencia and Columbus Square 11/24/2024 8 AM 16 Good Valencia and Legacy 11/24/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 11/24/2024 8 AM 16 Good Warner Avenue 11/24/2024 8 AM ** ** Warner and Armstrong 11/24/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Monday, November 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for wr Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park Period Ending 11/25/2024 8 AM Matter • 20 Level of Concern Good Hangar Fenceline - E Side 11/25/2024 8 AM 12 Good Hangar Fenceline - N Center 11/25/2024 8 AM 14 Good Hangar Fenceline - N Corner 11/25/2024 8 AM 9 Good Hangar Fenceline - NE Corner 11/25/2024 8 AM 15 Good Hangar Fenceline - NE Side 11/25/2024 8 AM ** ** Hangar Fenceline - S Corner 11/25/2024 8 AM 9 Good Hangar Fenceline - S Side 11/25/2024 8 AM ** ** Hangar Fenceline - SW Corner 11/25/2024 8 AM 14 Good Hangar Fenceline - SW Side 11/25/2024 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/25/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 11/25/2024 8 AM 11 Good Moffett and Tustin Ranch 11/25/2024 8 AM 8 Good Valencia and Armstrong 11/25/2024 8 AM 20 Good Valencia and Columbus Square 11/25/2024 8 AM 12 Good Valencia and Legacy 11/25/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 11/25/2024 8 AM 12 Good Warner Avenue 11/25/2024 8 AM 12 Good Warner and Armstrong 11/25/2024 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Tuesday, November 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for 5P Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park Period Ending 11/26/2024 8 AM Matter • 32 Level of Concern Good Hangar Fenceline - E Side 11/26/2024 8 AM 28 Good Hangar Fenceline - N Center 11/26/2024 8 AM 28 Good Hangar Fenceline - N Corner 11/26/2024 8 AM 20 Good Hangar Fenceline - NE Corner 11/26/2024 8 AM 36 Good Hangar Fenceline - NE Side 11/26/2024 8 AM ** ** Hangar Fenceline - S Corner 11/26/2024 8 AM 22 Good Hangar Fenceline - S Side 11/26/2024 8 AM 31 Good Hangar Fenceline - SW Corner 11/26/2024 8 AM 32 Good Hangar Fenceline - SW Side 11/26/2024 8 AM 25 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/26/2024 8 AM Particulate Matter • 24 Level of Concern Good Legacy Road 11/26/2024 8 AM 25 Good Moffett and Tustin Ranch 11/26/2024 8 AM 19 Good Valencia and Armstrong 11/26/2024 8 AM 43 Good Valencia and Columbus Square 11/26/2024 8 AM 27 Good Valencia and Legacy 11/26/2024 8 AM 28 Good Victory and Tustin Ranch Rd. 11/26/2024 8 AM 30 Good Warner Avenue 11/26/2024 8 AM 27 Good Warner and Armstrong 11/26/2024 8 AM 24 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Wednesday, November 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for wr Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 11/27/2024 8 AM Particulate Matter ** Level of Concern ** Hangar Fenceline - E Side 11/27/2024 8 AM 19 Good Hangar Fenceline - N Center 11/27/2024 8 AM 20 Good Hangar Fenceline - N Corner 11/27/2024 8 AM 14 Good Hangar Fenceline - NE Corner 11/27/2024 8 AM 25 Good Hangar Fenceline - NE Side 11/27/2024 8 AM ** ** Hangar Fenceline - S Corner 11/27/2024 8 AM 16 Good Hangar Fenceline - S Side 11/27/2024 8 AM 19 Good Hangar Fenceline - SW Corner 11/27/2024 8 AM 23 Good Hangar Fenceline - SW Side 11/27/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/27/2024 8 AM Particulate Matter • 17 Level of Concern Good Legacy Road 11/27/2024 8 AM 17 Good Moffett and Tustin Ranch 11/27/2024 8 AM 11 Good Valencia and Armstrong 11/27/2024 8 AM 31 Good Valencia and Columbus Square 11/27/2024 8 AM 22 Good Valencia and Legacy 11/27/2024 8 AM 19 Good Victory and Tustin Ranch Rd. 11/27/2024 8 AM 18 Good Warner Avenue 11/27/2024 8 AM 17 Good Warner and Armstrong 11/27/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Thursday, November 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for wr Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 11/28/2024 8 AM Particulate Matter Level of Concern Hangar Fenceline - E Side 11/28/2024 8 AM 41 Good Hangar Fenceline - N Center 11/28/2024 8 AM 43 Good Hangar Fenceline - N Corner 11/28/2024 8 AM 27 Good Hangar Fenceline - NE Corner 11/28/2024 8 AM 48 Good Hangar Fenceline - NE Side 11/28/2024 8 AM 36 Good Hangar Fenceline - S Corner 11/28/2024 8 AM 28 Good Hangar Fenceline - S Side 11/28/2024 8 AM 38 Good Hangar Fenceline - SW Corner 11/28/2024 8 AM 51 Good Hangar Fenceline - SW Side 11/28/2024 8 AM 37 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/28/2024 8 AM Particulate Matter • 37 Level of Concern Good Legacy Road 11/28/2024 8 AM 37 Good Moffett and Tustin Ranch 11/28/2024 8 AM 22 Good Valencia and Armstrong 11/28/2024 8 AM 61 Moderate Valencia and Columbus Square 11/28/2024 8 AM 44 Good Valencia and Legacy 11/28/2024 8 AM 38 Good Victory and Tustin Ranch Rd. 11/28/2024 8 AM 42 Good Warner Avenue 11/28/2024 8 AM 36 Good Warner and Armstrong 11/28/2024 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Friday, November 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for 5P Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park Period Ending 11/29/2024 8 AM Matter • 26 Level of Concern Good Hangar Fenceline - E Side 11/29/2024 8 AM 23 Good Hangar Fenceline - N Center 11/29/2024 8 AM 25 Good Hangar Fenceline - N Corner 11/29/2024 8 AM 20 Good Hangar Fenceline - NE Corner 11/29/2024 8 AM 29 Good Hangar Fenceline - NE Side 11/29/2024 8 AM 25 Good Hangar Fenceline - S Corner 11/29/2024 8 AM ** ** Hangar Fenceline - S Side 11/29/2024 8 AM 29 Good Hangar Fenceline - SW Corner 11/29/2024 8 AM 29 Good Hangar Fenceline - SW Side 11/29/2024 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/29/2024 8 AM Particulate Matter • 22 Level of Concern Good Legacy Road 11/29/2024 8 AM 21 Good Moffett and Tustin Ranch 11/29/2024 8 AM 16 Good Valencia and Armstrong 11/29/2024 8 AM 46 Good Valencia and Columbus Square 11/29/2024 8 AM 26 Good Valencia and Legacy 11/29/2024 8 AM 26 Good Victory and Tustin Ranch Rd. 11/29/2024 8 AM 29 Good Warner Avenue 11/29/2024 8 AM 23 Good Warner and Armstrong 11/29/2024 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Saturday, November 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for 5P Unhealthy Sensitive Groups (255 to 354) (155 to 254) * See below for further category descriptions. ** Data gap due to instrument malfunction Very UnhealthyHazardous (355 to 424) • Location Columbus Square Park Period Ending 11/30/2024 8 AM Matter • 15 Level of Concern Good Hangar Fenceline - E Side 11/30/2024 8 AM 13 Good Hangar Fenceline - N Center 11/30/2024 8 AM 14 Good Hangar Fenceline - N Corner 11/30/2024 8 AM 10 Good Hangar Fenceline - NE Corner 11/30/2024 8 AM 17 Good Hangar Fenceline - NE Side 11/30/2024 8 AM 14 Good Hangar Fenceline - S Corner 11/30/2024 8 AM ** ** Hangar Fenceline - S Side 11/30/2024 8 AM 16 Good Hangar Fenceline - SW Corner 11/30/2024 8 AM 15 Good Hangar Fenceline - SW Side 11/30/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period Ending 11/30/2024 8 AM Particulate Matter • 11 Level of Concern Good Legacy Road 11/30/2024 8 AM 11 Good Moffett and Tustin Ranch 11/30/2024 8 AM 10 Good Valencia and Armstrong 11/30/2024 8 AM 25 Good Valencia and Columbus Square 11/30/2024 8 AM 15 Good Valencia and Legacy 11/30/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 11/30/2024 8 AM 15 Good Warner Avenue 11/30/2024 8 AM 12 Good Warner and Armstrong 11/30/2024 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health cts is increased for everyone. 425 to 504 Health warning of emergency veryone is more co • •ns: elikely • be affected. Saturday, December 7, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/07/2024 8 AM Matter • 96 Level of Concern Moderate Hangar Fenceline - E Side 12/07/2024 8 AM 85 Moderate Hangar Fenceline - N Center 12/07/2024 8 AM 92 Moderate Hangar Fenceline - N Corner 12/07/2024 8 AM 64 Moderate Hangar Fenceline - NE Corner 12/07/2024 8 AM 87 Moderate Hangar Fenceline - NE Side 12/07/2024 8 AM 78 Moderate Hangar Fenceline - S Corner 12/07/2024 8 AM 63 Moderate Hangar Fenceline - S Side 12/07/2024 8 AM 83 Moderate Hangar Fenceline - SW Corner 12/07/2024 8 AM ** Hangar Fenceline - SW Side 12/07/2024 8 AM 74 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 12/07/2024 8 AM Particulate Matter • 78 Level of Concern Moderate Legacy Road 12/07/2024 8 AM 79 Moderate Moffett and Tustin Ranch 12/07/2024 8 AM 40 Good Valencia and Armstrong 12/07/2024 8 AM 124 Moderate Valencia and Columbus Square 12/07/2024 8 AM 93 Moderate Valencia and Legacy 12/07/2024 8 AM 83 Moderate Victory and Tustin Ranch Rd. 12/07/2024 8 AM 71 Moderate Warner Avenue 12/07/2024 8 AM 81 Moderate Warner and Armstrong 12/07/2024 8 AM 86 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eMasts is increased for everyone. Mq Hazardous 425 to 504 Health warning of emergency conditions: ever• • - likely • be affected. Sunday, December 8, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/08/2024 8 AM Matter 31 Level of Concern Good Hangar Fenceline - E Side 12/08/2024 8 AM ** ** Hangar Fenceline - N Center 12/08/2024 8 AM 29 Good Hangar Fenceline - N Corner 12/08/2024 8 AM 2S Good Hangar Fenceline - NE Corner 12/08/2024 8 AM 29 Good Hangar Fenceline - NE Side 12/08/2024 8 AM ** ** Hangar Fenceline - S Corner 12/08/2024 8 AM ** ** Hangar Fenceline - S Side 12/08/2024 8 AM 33 Good Hangar Fenceline - SW Corner 12/08/2024 8 AM 34 Good Hangar Fenceline - SW Side 12/08/2024 8 AM 26 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/08/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 12/08/2024 8 AM 24 Good Moffett and Tustin Ranch 12/08/2024 8 AM ** ** Valencia and Armstrong 12/08/2024 8 AM 49 Good Valencia and Columbus Square 12/08/2024 8 AM 31 Good Valencia and Legacy 12/08/2024 8 AM 30 Good Victory and Tustin Ranch Rd. 12/08/2024 8 AM 27 Good Warner Avenue 12/08/2024 8 AM 29 Good Warner and Armstrong 12/08/2024 8 AM 26 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, December 9, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/09/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 12/09/2024 8 AM 37 Good Hangar Fenceline - N Center 12/09/2024 8 AM 40 Good Hangar Fenceline - N Corner 12/09/2024 8 AM 29 Good Hangar Fenceline - NE Corner 12/09/2024 8 AM 39 Good Hangar Fenceline - NE Side 12/09/2024 8 AM 35 Good Hangar Fenceline - S Corner 12/09/2024 8 AM 32 Good Hangar Fenceline - S Side 12/09/2024 8 AM 37 Good Hangar Fenceline - SW Corner 12/09/2024 8 AM 45 Good Hangar Fenceline - SW Side 12/09/2024 8 AM 30 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/09/2024 8 AM Particulate Matter 35 Level of Concern Good Legacy Road 12/09/2024 8 AM 33 Good Moffett and Tustin Ranch 12/09/2024 8 AM 17 Good Valencia and Armstrong 12/09/2024 8 AM 58 Moderate Valencia and Columbus Square 12/09/2024 8 AM 44 Good Valencia and Legacy 12/09/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 12/09/2024 8 AM 31 Good Warner Avenue 12/09/2024 8 AM 35 Good Warner and Armstrong 12/09/2024 8 AM 33 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, December 10, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/10/2024 8 AM Matter 32 Level of Concern Good Hangar Fenceline - E Side 12/10/2024 8 AM 29 Good Hangar Fenceline - N Center 12/10/2024 8 AM 29 Good Hangar Fenceline - N Corner 12/10/2024 8 AM 22 Good Hangar Fenceline - NE Corner 12/10/2024 8 AM 28 Good Hangar Fenceline - NE Side 12/10/2024 8 AM 27 Good Hangar Fenceline - S Corner 12/10/2024 8 AM ** ** Hangar Fenceline - S Side 12/10/2024 8 AM 30 Good Hangar Fenceline - SW Corner 12/10/2024 8 AM 35 Good Hangar Fenceline - SW Side 12/10/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 12/10/2024 8 AM Particulate Matter 25 Level of Concern Good Legacy Road 12/10/2024 8 AM 24 Good Moffett and Tustin Ranch 12/10/2024 8 AM 14 Good Valencia and Armstrong 12/10/2024 8 AM 43 Good Valencia and Columbus Square 12/10/2024 8 AM 31 Good Valencia and Legacy 12/10/2024 8 AM 20 Good Victory and Tustin Ranch Rd. 12/10/2024 8 AM 24 Good Warner Avenue 12/10/2024 8 AM 28 Good Warner and Armstrong 12/10/2024 8 AM 66 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, December 11, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/11/2024 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 12/11/2024 8 AM 13 Good Hangar Fenceline - N Center 12/11/2024 8 AM 14 Good Hangar Fenceline - N Corner 12/11/2024 8 AM 9 Good Hangar Fenceline - NE Corner 12/11/2024 8 AM 12 Good Hangar Fenceline - NE Side 12/11/2024 8 AM 14 Good Hangar Fenceline - S Corner 12/11/2024 8 AM 9 Good Hangar Fenceline - S Side 12/11/2024 8 AM 14 Good Hangar Fenceline - SW Corner 12/11/2024 8 AM 20 Good Hangar Fenceline - SW Side 12/11/2024 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/11/2024 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 12/11/2024 8 AM 10 Good Moffett and Tustin Ranch 12/11/2024 8 AM 6 Good Valencia and Armstrong 12/11/2024 8 AM 18 Good Valencia and Columbus Square 12/11/2024 8 AM ** ** Valencia and Legacy 12/11/2024 8 AM 5 Good Victory and Tustin Ranch Rd. 12/11/2024 8 AM 7 Good Warner Avenue 12/11/2024 8 AM 11 Good Warner and Armstrong 12/11/2024 8 AM 66 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, December 12, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/12/2024 8 AM Matter 22 Level of Concern Good Hangar Fenceline - E Side 12/12/2024 8 AM 24 Good Hangar Fenceline - N Center 12/12/2024 8 AM 24 Good Hangar Fenceline - N Corner 12/12/2024 8 AM 19 Good Hangar Fenceline - NE Corner 12/12/2024 8 AM 23 Good Hangar Fenceline - NE Side 12/12/2024 8 AM 2S Good Hangar Fenceline - S Corner 12/12/2024 8 AM 18 Good Hangar Fenceline - S Side 12/12/2024 8 AM 24 Good Hangar Fenceline - SW Corner 12/12/2024 8 AM 32 Good Hangar Fenceline - SW Side 12/12/2024 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/12/2024 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 12/12/2024 8 AM 18 Good Moffett and Tustin Ranch 12/12/2024 8 AM 10 Good Valencia and Armstrong 12/12/2024 8 AM 39 Good Valencia and Columbus Square 12/12/2024 8 AM 24 Good Valencia and Legacy 12/12/2024 8 AM 14 Good Victory and Tustin Ranch Rd. 12/12/2024 8 AM 18 Good Warner Avenue 12/12/2024 8 AM 22 Good Warner and Armstrong 12/12/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, December 13, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/13/2024 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 12/13/2024 8 AM 17 Good Hangar Fenceline - N Center 12/13/2024 8 AM 23 Good Hangar Fenceline - N Corner 12/13/2024 8 AM ** ** Hangar Fenceline - NE Corner 12/13/2024 8 AM 16 Good Hangar Fenceline - NE Side 12/13/2024 8 AM 15 Good Hangar Fenceline - S Corner 12/13/2024 8 AM 14 Good Hangar Fenceline - S Side 12/13/2024 8 AM 16 Good Hangar Fenceline - SW Corner 12/13/2024 8 AM 21 Good Hangar Fenceline - SW Side 12/13/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/13/2024 8 AM Particulate Matter 16 Level of Concern Good Legacy Road 12/13/2024 8 AM 14 Good Moffett and Tustin Ranch 12/13/2024 8 AM ** ** Valencia and Armstrong 12/13/2024 8 AM 23 Good Valencia and Columbus Square 12/13/2024 8 AM 16 Good Valencia and Legacy 12/13/2024 8 AM 10 Good Victory and Tustin Ranch Rd. 12/13/2024 8 AM 12 Good Warner Avenue 12/13/2024 8 AM 14 Good Warner and Armstrong 12/13/2024 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, December 14, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/14/2024 8 AM Matter 24 Level of Concern Good Hangar Fenceline - E Side 12/14/2024 8 AM 21 Good Hangar Fenceline - N Center 12/14/2024 8 AM 23 Good Hangar Fenceline - N Corner 12/14/2024 8 AM ** ** Hangar Fenceline - NE Corner 12/14/2024 8 AM 21 Good Hangar Fenceline - NE Side 12/14/2024 8 AM 27 Good Hangar Fenceline - S Corner 12/14/2024 8 AM 15 Good Hangar Fenceline - S Side 12/14/2024 8 AM 19 Good Hangar Fenceline - SW Corner 12/14/2024 8 AM 23 Good Hangar Fenceline - SW Side 12/14/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 12/14/2024 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 12/14/2024 8 AM 18 Good Moffett and Tustin Ranch 12/14/2024 8 AM 7 Good Valencia and Armstrong 12/14/2024 8 AM 28 Good Valencia and Columbus Square 12/14/2024 8 AM 20 Good Valencia and Legacy 12/14/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 12/14/2024 8 AM 15 Good Warner Avenue 12/14/2024 8 AM ** ** Warner and Armstrong 12/14/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, December 15, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/15/2024 8 AM Matter 18 Level of Concern Good Hangar Fenceline - E Side 12/15/2024 8 AM 20 Good Hangar Fenceline - N Center 12/15/2024 8 AM 21 Good Hangar Fenceline - N Corner 12/15/2024 8 AM 15 Good Hangar Fenceline - NE Corner 12/15/2024 8 AM 20 Good Hangar Fenceline - NE Side 12/15/2024 8 AM 23 Good Hangar Fenceline - S Corner 12/15/2024 8 AM 15 Good Hangar Fenceline - S Side 12/15/2024 8 AM 20 Good Hangar Fenceline - SW Corner 12/15/2024 8 AM 21 Good Hangar Fenceline - SW Side 12/15/2024 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/15/2024 8 AM Particulate Matter 17 Level of Concern Good Legacy Road 12/15/2024 8 AM 16 Good Moffett and Tustin Ranch 12/15/2024 8 AM ** ** Valencia and Armstrong 12/15/2024 8 AM 30 Good Valencia and Columbus Square 12/15/2024 8 AM 24 Good Valencia and Legacy 12/15/2024 8 AM 12 Good Victory and Tustin Ranch Rd. 12/15/2024 8 AM 16 Good Warner Avenue 12/15/2024 8 AM 18 Good Warner and Armstrong 12/15/2024 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, December 16, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/16/2024 8 AM Matter 29 Level of Concern Good Hangar Fenceline - E Side 12/16/2024 8 AM 26 Good Hangar Fenceline - N Center 12/16/2024 8 AM 28 Good Hangar Fenceline - N Corner 12/16/2024 8 AM 21 Good Hangar Fenceline - NE Corner 12/16/2024 8 AM 27 Good Hangar Fenceline - NE Side 12/16/2024 8 AM 2S Good Hangar Fenceline - S Corner 12/16/2024 8 AM 22 Good Hangar Fenceline - S Side 12/16/2024 8 AM 23 Good Hangar Fenceline - SW Corner 12/16/2024 8 AM 31 Good Hangar Fenceline - SW Side 12/16/2024 8 AM 23 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/16/2024 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 12/16/2024 8 AM 24 Good Moffett and Tustin Ranch 12/16/2024 8 AM ** ** Valencia and Armstrong 12/16/2024 8 AM 29 Good Valencia and Columbus Square 12/16/2024 8 AM 28 Good Valencia and Legacy 12/16/2024 8 AM 17 Good Victory and Tustin Ranch Rd. 12/16/2024 8 AM ** ** Warner Avenue 12/16/2024 8 AM 26 Good Warner and Armstrong 12/16/2024 8 AM 26 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, December 17, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/17/2024 8 AM Matter 21 Level of Concern Good Hangar Fenceline - E Side 12/17/2024 8 AM 23 Good Hangar Fenceline - N Center 12/17/2024 8 AM 23 Good Hangar Fenceline - N Corner 12/17/2024 8 AM 18 Good Hangar Fenceline - NE Corner 12/17/2024 8 AM ** ** Hangar Fenceline - NE Side 12/17/2024 8 AM 20 Good Hangar Fenceline - S Corner 12/17/2024 8 AM ** ** Hangar Fenceline - S Side 12/17/2024 8 AM 20 Good Hangar Fenceline - SW Corner 12/17/2024 8 AM 27 Good Hangar Fenceline - SW Side 12/17/2024 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/17/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 12/17/2024 8 AM 19 Good Moffett and Tustin Ranch 12/17/2024 8 AM 8 Good Valencia and Armstrong 12/17/2024 8 AM 32 Good Valencia and Columbus Square 12/17/2024 8 AM 24 Good Valencia and Legacy 12/17/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 12/17/2024 8 AM 20 Good Warner Avenue 12/17/2024 8 AM 20 Good Warner and Armstrong 12/17/2024 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, December 18, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/18/2024 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 12/18/2024 8 AM 19 Good Hangar Fenceline - N Center 12/18/2024 8 AM 19 Good Hangar Fenceline - N Corner 12/18/2024 8 AM 15 Good Hangar Fenceline - NE Corner 12/18/2024 8 AM ** ** Hangar Fenceline - NE Side 12/18/2024 8 AM 27 Good Hangar Fenceline - S Corner 12/18/2024 8 AM 16 Good Hangar Fenceline - S Side 12/18/2024 8 AM 16 Good Hangar Fenceline - SW Corner 12/18/2024 8 AM 22 Good Hangar Fenceline - SW Side 12/18/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 12/18/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 12/18/2024 8 AM 15 Good Moffett and Tustin Ranch 12/18/2024 8 AM 7 Good Valencia and Armstrong 12/18/2024 8 AM 27 Good Valencia and Columbus Square 12/18/2024 8 AM 18 Good Valencia and Legacy 12/18/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 12/18/2024 8 AM 14 Good Warner Avenue 12/18/2024 8 AM 9 Good Warner and Armstrong 12/18/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, December 19, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/19/2024 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 12/19/2024 8 AM 19 Good Hangar Fenceline - N Center 12/19/2024 8 AM 19 Good Hangar Fenceline - N Corner 12/19/2024 8 AM 15 Good Hangar Fenceline - NE Corner 12/19/2024 8 AM 18 Good Hangar Fenceline - NE Side 12/19/2024 8 AM 27 Good Hangar Fenceline - S Corner 12/19/2024 8 AM 16 Good Hangar Fenceline - S Side 12/19/2024 8 AM 16 Good Hangar Fenceline - SW Corner 12/19/2024 8 AM 22 Good Hangar Fenceline - SW Side 12/19/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/19/2024 8 AM Particulate Matter 14 Level of Concern Good Legacy Road 12/19/2024 8 AM 15 Good Moffett and Tustin Ranch 12/19/2024 8 AM 7 Good Valencia and Armstrong 12/19/2024 8 AM 27 Good Valencia and Columbus Square 12/19/2024 8 AM 18 Good Valencia and Legacy 12/19/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 12/19/2024 8 AM 14 Good Warner Avenue 12/19/2024 8 AM ** ** Warner and Armstrong 12/19/2024 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, December 20, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/20/2024 8 AM Matter 58 Level of Concern Moderate Hangar Fenceline - E Side 12/20/2024 8 AM 41 Good Hangar Fenceline - N Center 12/20/2024 8 AM 4S Good Hangar Fenceline - N Corner 12/20/2024 8 AM 27 Good Hangar Fenceline - NE Corner 12/20/2024 8 AM 41 Good Hangar Fenceline - NE Side 12/20/2024 8 AM 49 Good Hangar Fenceline - S Corner 12/20/2024 8 AM 31 Good Hangar Fenceline - S Side 12/20/2024 8 AM 26 Good Hangar Fenceline - SW Corner 12/20/2024 8 AM 43 Good Hangar Fenceline - SW Side 12/20/2024 8 AM 36 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/20/2024 8 AM Particulate Matter 36 Level of Concern Good Legacy Road 12/20/2024 8 AM 34 Good Moffett and Tustin Ranch 12/20/2024 8 AM ** ** Valencia and Armstrong 12/20/2024 8 AM 47 Good Valencia and Columbus Square 12/20/2024 8 AM 44 Good Valencia and Legacy 12/20/2024 8 AM 21 Good Victory and Tustin Ranch Rd. 12/20/2024 8 AM 24 Good Warner Avenue 12/20/2024 8 AM 37 Good Warner and Armstrong 12/20/2024 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, December 21, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/21/2024 8 AM Matter 98 Level of Concern Moderate Hangar Fenceline - E Side 12/21/2024 8 AM 69 Moderate Hangar Fenceline - N Center 12/21/2024 8 AM 86 Moderate Hangar Fenceline - N Corner 12/21/2024 8 AM 43 Good Hangar Fenceline - NE Corner 12/21/2024 8 AM 70 Moderate Hangar Fenceline - NE Side 12/21/2024 8 AM 57 Moderate Hangar Fenceline - S Corner 12/21/2024 8 AM 46 Good Hangar Fenceline - S Side 12/21/2024 8 AM 47 Good Hangar Fenceline - SW Corner 12/21/2024 8 AM 63 Moderate Hangar Fenceline - SW Side 12/21/2024 8 AM 66 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 12/21/2024 8 AM Particulate Matter 57 Level of Concern Moderate Legacy Road 12/21/2024 8 AM 61 Moderate Moffett and Tustin Ranch 12/21/2024 8 AM 15 Good Valencia and Armstrong 12/21/2024 8 AM 72 Moderate Valencia and Columbus Square 12/21/2024 8 AM 73 Moderate Valencia and Legacy 12/21/2024 8 AM 33 Good Victory and Tustin Ranch Rd. 12/21/2024 8 AM 51 Moderate Warner Avenue 12/21/2024 8 AM 64 Moderate Warner and Armstrong 12/21/2024 8 AM 58 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, December 22, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/22/2024 8 AM Matter 74 Level of Concern Moderate Hangar Fenceline - E Side 12/22/2024 8 AM 45 Good Hangar Fenceline - N Center 12/22/2024 8 AM 48 Good Hangar Fenceline - N Corner 12/22/2024 8 AM 35 Good Hangar Fenceline - NE Corner 12/22/2024 8 AM 47 Good Hangar Fenceline - NE Side 12/22/2024 8 AM 46 Good Hangar Fenceline - S Corner 12/22/2024 8 AM 35 Good Hangar Fenceline - S Side 12/22/2024 8 AM 39 Good Hangar Fenceline - SW Corner 12/22/2024 8 AM 51 Good Hangar Fenceline - SW Side 12/22/2024 8 AM 42 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/22/2024 8 AM Particulate Matter 38 Level of Concern Good Legacy Road 12/22/2024 8 AM 43 Good Moffett and Tustin Ranch 12/22/2024 8 AM 12 Good Valencia and Armstrong 12/22/2024 8 AM 55 Moderate Valencia and Columbus Square 12/22/2024 8 AM 49 Good Valencia and Legacy 12/22/2024 8 AM 31 Good Victory and Tustin Ranch Rd. 12/22/2024 8 AM ** ** Warner Avenue 12/22/2024 8 AM 45 Good Warner and Armstrong 12/22/2024 8 AM 45 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, December 23, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/23/2024 8 AM Matter 61 Level of Concern Moderate Hangar Fenceline - E Side 12/23/2024 8 AM 34 Good Hangar Fenceline - N Center 12/23/2024 8 AM 36 Good Hangar Fenceline - N Corner 12/23/2024 8 AM 25 Good Hangar Fenceline - NE Corner 12/23/2024 8 AM 35 Good Hangar Fenceline - NE Side 12/23/2024 8 AM ** ** Hangar Fenceline - S Corner 12/23/2024 8 AM 26 Good Hangar Fenceline - S Side 12/23/2024 8 AM 30 Good Hangar Fenceline - SW Corner 12/23/2024 8 AM 41 Good Hangar Fenceline - SW Side 12/23/2024 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/23/2024 8 AM Particulate Matter 28 Level of Concern Good Legacy Road 12/23/2024 8 AM 30 Good Moffett and Tustin Ranch 12/23/2024 8 AM ** ** Valencia and Armstrong 12/23/2024 8 AM 41 Good Valencia and Columbus Square 12/23/2024 8 AM 38 Good Valencia and Legacy 12/23/2024 8 AM 22 Good Victory and Tustin Ranch Rd. 12/23/2024 8 AM 19 Good Warner Avenue 12/23/2024 8 AM 31 Good Warner and Armstrong 12/23/2024 8 AM 30 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, December 24, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/24/2024 8 AM Matter 87 Level of Concern Moderate Hangar Fenceline - E Side 12/24/2024 8 AM 55 Moderate Hangar Fenceline - N Center 12/24/2024 8 AM 56 Moderate Hangar Fenceline - N Corner 12/24/2024 8 AM 35 Good Hangar Fenceline - NE Corner 12/24/2024 8 AM 55 Moderate Hangar Fenceline - NE Side 12/24/2024 8 AM 52 Good Hangar Fenceline - S Corner 12/24/2024 8 AM 35 Good Hangar Fenceline - S Side 12/24/2024 8 AM 38 Good Hangar Fenceline - SW Corner 12/24/2024 8 AM 51 Good Hangar Fenceline - SW Side 12/24/2024 8 AM 51 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/24/2024 8 AM Particulate Matter 45 Level of Concern Good Legacy Road 12/24/2024 8 AM 44 Good Moffett and Tustin Ranch 12/24/2024 8 AM ** ** Valencia and Armstrong 12/24/2024 8 AM 58 Moderate Valencia and Columbus Square 12/24/2024 8 AM 58 Moderate Valencia and Legacy 12/24/2024 8 AM 25 Good Victory and Tustin Ranch Rd. 12/24/2024 8 AM 30 Good Warner Avenue 12/24/2024 8 AM 49 Good Warner and Armstrong 12/24/2024 8 AM 38 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, December 25, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/25/2024 8 AM Matter 61 Level of Concern Moderate Hangar Fenceline - E Side 12/25/2024 8 AM ** ** Hangar Fenceline - N Center 12/25/2024 8 AM 28 Good Hangar Fenceline - N Corner 12/25/2024 8 AM 19 Good Hangar Fenceline - NE Corner 12/25/2024 8 AM 26 Good Hangar Fenceline - NE Side 12/25/2024 8 AM 24 Good Hangar Fenceline - S Corner 12/25/2024 8 AM 18 Good Hangar Fenceline - S Side 12/25/2024 8 AM 26 Good Hangar Fenceline - SW Corner 12/25/2024 8 AM 27 Good Hangar Fenceline - SW Side 12/25/2024 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/25/2024 8 AM Particulate Matter 22 Level of Concern Good Legacy Road 12/25/2024 8 AM 23 Good Moffett and Tustin Ranch 12/25/2024 8 AM ** ** Valencia and Armstrong 12/25/2024 8 AM 28 Good Valencia and Columbus Square 12/25/2024 8 AM 29 Good Valencia and Legacy 12/25/2024 8 AM 15 Good Victory and Tustin Ranch Rd. 12/25/2024 8 AM 18 Good Warner Avenue 12/25/2024 8 AM 24 Good Warner and Armstrong 12/25/2024 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, December 26, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/26/2024 8 AM Matter 43 Level of Concern Good Hangar Fenceline - E Side 12/26/2024 8 AM 16 Good Hangar Fenceline - N Center 12/26/2024 8 AM ** ** Hangar Fenceline - N Corner 12/26/2024 8 AM 12 Good Hangar Fenceline - NE Corner 12/26/2024 8 AM 16 Good Hangar Fenceline - NE Side 12/26/2024 8 AM 24 Good Hangar Fenceline - S Corner 12/26/2024 8 AM ** ** Hangar Fenceline - S Side 12/26/2024 8 AM 14 Good Hangar Fenceline - SW Corner 12/26/2024 8 AM 17 Good Hangar Fenceline - SW Side 12/26/2024 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/26/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 12/26/2024 8 AM 13 Good Moffett and Tustin Ranch 12/26/2024 8 AM ** ** Valencia and Armstrong 12/26/2024 8 AM 22 Good Valencia and Columbus Square 12/26/2024 8 AM 16 Good Valencia and Legacy 12/26/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 12/26/2024 8 AM 14 Good Warner Avenue 12/26/2024 8 AM 13 Good Warner and Armstrong 12/26/2024 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, December 27, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/27/2024 8 AM Matter 48 Level of Concern Good Hangar Fenceline - E Side 12/27/2024 8 AM 16 Good Hangar Fenceline - N Center 12/27/2024 8 AM 18 Good Hangar Fenceline - N Corner 12/27/2024 8 AM ** ** Hangar Fenceline - NE Corner 12/27/2024 8 AM 16 Good Hangar Fenceline - NE Side 12/27/2024 8 AM 29 Good Hangar Fenceline - S Corner 12/27/2024 8 AM 12 Good Hangar Fenceline - S Side 12/27/2024 8 AM 15 Good Hangar Fenceline - SW Corner 12/27/2024 8 AM 16 Good Hangar Fenceline - SW Side 12/27/2024 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/27/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 12/27/2024 8 AM ** ** Moffett and Tustin Ranch 12/27/2024 8 AM 15 Good Valencia and Armstrong 12/27/2024 8 AM 21 Good Valencia and Columbus Square 12/27/2024 8 AM 17 Good Valencia and Legacy 12/27/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 12/27/2024 8 AM ** ** Warner Avenue 12/27/2024 8 AM 14 Good Warner and Armstrong 12/27/2024 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, December 28, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/28/2024 8 AM Matter 53 Level of Concern Good Hangar Fenceline - E Side 12/28/2024 8 AM 19 Good Hangar Fenceline - N Center 12/28/2024 8 AM 21 Good Hangar Fenceline - N Corner 12/28/2024 8 AM 13 Good Hangar Fenceline - NE Corner 12/28/2024 8 AM 19 Good Hangar Fenceline - NE Side 12/28/2024 8 AM 26 Good Hangar Fenceline - S Corner 12/28/2024 8 AM ** ** Hangar Fenceline - S Side 12/28/2024 8 AM 16 Good Hangar Fenceline - SW Corner 12/28/2024 8 AM 19 Good Hangar Fenceline - SW Side 12/28/2024 8 AM 15 Good • •24-Hour Hangar Fenceline - W Side Period • • 12/28/2024 8 AM Particulate Matter 16 Level of Concern Good Legacy Road 12/28/2024 8 AM 18 Good Moffett and Tustin Ranch 12/28/2024 8 AM 16 Good Valencia and Armstrong 12/28/2024 8 AM 21 Good Valencia and Columbus Square 12/28/2024 8 AM 20 Good Valencia and Legacy 12/28/2024 8 AM 11 Good Victory and Tustin Ranch Rd. 12/28/2024 8 AM 15 Good Warner Avenue 12/28/2024 8 AM 17 Good Warner and Armstrong 12/28/2024 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, December 29, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/29/2024 8 AM Matter 107 Level of Concern Moderate Hangar Fenceline - E Side 12/29/2024 8 AM 65 Moderate Hangar Fenceline - N Center 12/29/2024 8 AM 66 Moderate Hangar Fenceline - N Corner 12/29/2024 8 AM 46 Good Hangar Fenceline - NE Corner 12/29/2024 8 AM 66 Moderate Hangar Fenceline - NE Side 12/29/2024 8 AM 56 Moderate Hangar Fenceline - S Corner 12/29/2024 8 AM ** ** Hangar Fenceline - S Side 12/29/2024 8 AM 55 Moderate Hangar Fenceline - SW Corner 12/29/2024 8 AM 69 Moderate Hangar Fenceline - SW Side 12/29/2024 8 AM 58 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 12/29/2024 8 AM Particulate Matter 52 Level of Concern Good Legacy Road 12/29/2024 8 AM 62 Moderate Moffett and Tustin Ranch 12/29/2024 8 AM 55 Moderate Valencia and Armstrong 12/29/2024 8 AM 63 Moderate Valencia and Columbus Square 12/29/2024 8 AM 68 Moderate Valencia and Legacy 12/29/2024 8 AM ** ** Victory and Tustin Ranch Rd. 12/29/2024 8 AM 47 Good Warner Avenue 12/29/2024 8 AM 57 Moderate Warner and Armstrong 12/29/2024 8 AM 51 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, December 30, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/30/2024 8 AM Matter 88 Level of Concern Moderate Hangar Fenceline - E Side 12/30/2024 8 AM 95 Moderate Hangar Fenceline - N Center 12/30/2024 8 AM 94 Moderate Hangar Fenceline - N Corner 12/30/2024 8 AM 70 Moderate Hangar Fenceline - NE Corner 12/30/2024 8 AM 96 Moderate Hangar Fenceline - NE Side 12/30/2024 8 AM 78 Moderate Hangar Fenceline - S Corner 12/30/2024 8 AM 75 Moderate Hangar Fenceline - S Side 12/30/2024 8 AM 87 Moderate Hangar Fenceline - SW Corner 12/30/2024 8 AM 117 Moderate Hangar Fenceline - SW Side 12/30/2024 8 AM 85 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 12/30/2024 8 AM Particulate Matter ** Level of Concern ** Legacy Road 12/30/2024 8 AM 91 Moderate Moffett and Tustin Ranch 12/30/2024 8 AM 81 Moderate Valencia and Armstrong 12/30/2024 8 AM 99 Moderate Valencia and Columbus Square 12/30/2024 8 AM 99 Moderate Valencia and Legacy 12/30/2024 8 AM 60 Moderate Victory and Tustin Ranch Rd. 12/30/2024 8 AM 75 Moderate Warner Avenue 12/30/2024 8 AM 85 Moderate Warner and Armstrong 12/30/2024 8 AM 82 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, December 31, 2024 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 12/31/2024 8 AM Matter 45 Level of Concern Good Hangar Fenceline - E Side 12/31/2024 8 AM 49 Good Hangar Fenceline - N Center 12/31/2024 8 AM 51 Good Hangar Fenceline - N Corner 12/31/2024 8 AM 36 Good Hangar Fenceline - NE Corner 12/31/2024 8 AM 51 Good Hangar Fenceline - NE Side 12/31/2024 8 AM 45 Good Hangar Fenceline - S Corner 12/31/2024 8 AM 39 Good Hangar Fenceline - S Side 12/31/2024 8 AM 44 Good Hangar Fenceline - SW Corner 12/31/2024 8 AM 66 Moderate Hangar Fenceline - SW Side 12/31/2024 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 12/31/2024 8 AM Particulate Matter 39 Level of Concern Good Legacy Road 12/31/2024 8 AM 48 Good Moffett and Tustin Ranch 12/31/2024 8 AM 41 Good Valencia and Armstrong 12/31/2024 8 AM 54 Good Valencia and Columbus Square 12/31/2024 8 AM 53 Good Valencia and Legacy 12/31/2024 8 AM 29 Good Victory and Tustin Ranch Rd. 12/31/2024 8 AM 36 Good Warner Avenue 12/31/2024 8 AM 43 Good Warner and Armstrong 12/31/2024 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 1, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/01/2025 8 AM Matter 105 Level of Concern Moderate Hangar Fenceline - E Side 01/01/2025 8 AM 117 Moderate Hangar Fenceline - N Center 01/01/2025 8 AM 120 Moderate Hangar Fenceline - N Corner 01/01/2025 8 AM 89 Moderate Hangar Fenceline - NE Corner 01/01/2025 8 AM 120 Moderate Hangar Fenceline - NE Side 01/01/2025 8 AM 96 Moderate Hangar Fenceline - S Corner 01/01/2025 8 AM 90 Moderate Hangar Fenceline - S Side 01/01/2025 8 AM 106 Moderate Hangar Fenceline - SW Corner 01/01/2025 8 AM 191 Unhealthy for Sensitive Groups • •24-Hour Hangar Fenceline - SW Side Period • • 01/01/2025 8 AM Particulate Matter 108 Level of Concern Moderate Hangar Fenceline - W Side 01/01/2025 8 AM 93 Moderate Legacy Road 01/01/2025 8 AM 114 Moderate Moffett and Tustin Ranch 01/01/2025 8 AM 98 Moderate Valencia and Armstrong 01/01/2025 8 AM 122 Moderate Valencia and Columbus Square 01/01/2025 8 AM 126 Moderate Valencia and Legacy 01/01/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/01/2025 8 AM 92 Moderate Warner Avenue 01/01/2025 8 AM 106 Moderate Warner and Armstrong 01/01/2025 8 AM 104 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 5047 Health warning of emergency conditions: ever•ne is more likely to be affected. Thursday, January 2, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/02/2025 8 AM Matter 86 Level of Concern Moderate Hangar Fenceline - E Side 01/02/2025 8 AM 99 Moderate Hangar Fenceline - N Center 01/02/2025 8 AM 103 Moderate Hangar Fenceline - N Corner 01/02/2025 8 AM 72 Moderate Hangar Fenceline - NE Corner 01/02/2025 8 AM 96 Moderate Hangar Fenceline - NE Side 01/02/2025 8 AM 80 Moderate Hangar Fenceline - S Corner 01/02/2025 8 AM 70 Moderate Hangar Fenceline - S Side 01/02/2025 8 AM 84 Moderate Hangar Fenceline - SW Corner 01/02/2025 8 AM 107 Moderate Hangar Fenceline - SW Side 01/02/2025 8 AM 89 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/02/2025 8 AM Particulate Matter 76 Level of Concern Moderate Legacy Road 01/02/2025 8 AM 101 Moderate Moffett and Tustin Ranch 01/02/2025 8 AM 84 Moderate Valencia and Armstrong 01/02/2025 8 AM 98 Moderate Valencia and Columbus Square 01/02/2025 8 AM 105 Moderate Valencia and Legacy 01/02/2025 8 AM 51 Good Victory and Tustin Ranch Rd. 01/02/2025 8 AM 73 Moderate Warner Avenue 01/02/2025 8 AM 87 Moderate Warner and Armstrong 01/02/2025 8 AM 77 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 3, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/03/2025 8 AM Matter 59 Level of Concern Moderate Hangar Fenceline - E Side 01/03/2025 8 AM 66 Moderate Hangar Fenceline - N Center 01/03/2025 8 AM 74 Moderate Hangar Fenceline - N Corner 01/03/2025 8 AM 44 Good Hangar Fenceline - NE Corner 01/03/2025 8 AM 66 Moderate Hangar Fenceline - NE Side 01/03/2025 8 AM 47 Good Hangar Fenceline - S Corner 01/03/2025 8 AM 46 Good Hangar Fenceline - S Side 01/03/2025 8 AM 51 Good Hangar Fenceline - SW Corner 01/03/2025 8 AM 71 Moderate Hangar Fenceline - SW Side 01/03/2025 8 AM 62 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/03/2025 8 AM Particulate Matter 48 Level of Concern Good Legacy Road 01/03/2025 8 AM 60 Moderate Moffett and Tustin Ranch 01/03/2025 8 AM 58 Moderate Valencia and Armstrong 01/03/2025 8 AM 72 Moderate Valencia and Columbus Square 01/03/2025 8 AM 69 Moderate Valencia and Legacy 01/03/2025 8 AM 37 Good Victory and Tustin Ranch Rd. 01/03/2025 8 AM 40 Good Warner Avenue 01/03/2025 8 AM 61 Moderate Warner and Armstrong 01/03/2025 8 AM 41 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 4, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/04/2025 8 AM 59 Moderate Hangar Fenceline - E Side 01/04/2025 8 AM 64 Moderate Hangar Fenceline - N Center 01/04/2025 8 AM 65 Moderate Hangar Fenceline - N Corner 01/04/2025 8 AM 50 Good Hangar Fenceline - NE Corner 01/04/2025 8 AM 65 Moderate Hangar Fenceline - NE Side 01/04/2025 8 AM 49 Good Hangar Fenceline - S Corner 01/04/2025 8 AM 50 Good Hangar Fenceline - S Side 01/04/2025 8 AM 61 Moderate Hangar Fenceline - SW Corner 01/04/2025 8 AM 88 Moderate Hangar Fenceline - SW Side 01/04/2025 8 AM 62 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/04/2025 8 AM Particulate Matter 52 Level of Concern Good Legacy Road 01/04/2025 8 AM 62 Moderate Moffett and Tustin Ranch 01/04/2025 8 AM 58 Moderate Valencia and Armstrong 01/04/2025 8 AM 73 Moderate Valencia and Columbus Square 01/04/2025 8 AM 71 Moderate Valencia and Legacy 01/04/2025 8 AM 42 Good Victory and Tustin Ranch Rd. 01/04/2025 8 AM 53 Good Warner Avenue 01/04/2025 8 AM 59 Moderate Warner and Armstrong 01/04/2025 8 AM 58 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 5, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/05/2025 8 AM Matter 37 Level of Concern Good Hangar Fenceline - E Side 01/05/2025 8 AM 41 Good Hangar Fenceline - N Center 01/05/2025 8 AM 45 Good Hangar Fenceline - N Corner 01/05/2025 8 AM 29 Good Hangar Fenceline - NE Corner 01/05/2025 8 AM 41 Good Hangar Fenceline - NE Side 01/05/2025 8 AM 55 Moderate Hangar Fenceline - S Corner 01/05/2025 8 AM 31 Good Hangar Fenceline - S Side 01/05/2025 8 AM 35 Good Hangar Fenceline - SW Corner 01/05/2025 8 AM 49 Good Hangar Fenceline - SW Side 01/05/2025 8 AM 39 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/05/2025 8 AM Particulate Matter 34 Level of Concern Good Legacy Road 01/05/2025 8 AM 43 Good Moffett and Tustin Ranch 01/05/2025 8 AM 37 Good Valencia and Armstrong 01/05/2025 8 AM 43 Good Valencia and Columbus Square 01/05/2025 8 AM 43 Good Valencia and Legacy 01/05/2025 8 AM 24 Good Victory and Tustin Ranch Rd. 01/05/2025 8 AM 31 Good Warner Avenue 01/05/2025 8 AM 38 Good Warner and Armstrong 01/05/2025 8 AM 37 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 6, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/06/2025 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 01/06/2025 8 AM 32 Good Hangar Fenceline - N Center 01/06/2025 8 AM 33 Good Hangar Fenceline - N Corner 01/06/2025 8 AM 27 Good Hangar Fenceline - NE Corner 01/06/2025 8 AM 32 Good Hangar Fenceline - NE Side 01/06/2025 8 AM 50 Good Hangar Fenceline - S Corner 01/06/2025 8 AM 27 Good Hangar Fenceline - S Side 01/06/2025 8 AM 31 Good Hangar Fenceline - SW Corner 01/06/2025 8 AM 42 Good Hangar Fenceline - SW Side 01/06/2025 8 AM 28 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/06/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 01/06/2025 8 AM 30 Good Moffett and Tustin Ranch 01/06/2025 8 AM 31 Good Valencia and Armstrong 01/06/2025 8 AM 43 Good Valencia and Columbus Square 01/06/2025 8 AM 35 Good Valencia and Legacy 01/06/2025 8 AM 22 Good Victory and Tustin Ranch Rd. 01/06/2025 8 AM 27 Good Warner Avenue 01/06/2025 8 AM 31 Good Warner and Armstrong 01/06/2025 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 7, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/07/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 01/07/2025 8 AM 15 Good Hangar Fenceline - N Center 01/07/2025 8 AM 17 Good Hangar Fenceline - N Corner 01/07/2025 8 AM 14 Good Hangar Fenceline - NE Corner 01/07/2025 8 AM 16 Good Hangar Fenceline - NE Side 01/07/2025 8 AM 36 Good Hangar Fenceline - S Corner 01/07/2025 8 AM 14 Good Hangar Fenceline - S Side 01/07/2025 8 AM 14 Good Hangar Fenceline - SW Corner 01/07/2025 8 AM 19 Good Hangar Fenceline - SW Side 01/07/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/07/2025 8 AM Particulate Matter 20 Level of Concern Good Legacy Road 01/07/2025 8 AM 14 Good Moffett and Tustin Ranch 01/07/2025 8 AM 13 Good Valencia and Armstrong 01/07/2025 8 AM 23 Good Valencia and Columbus Square 01/07/2025 8 AM 16 Good Valencia and Legacy 01/07/2025 8 AM 10 Good Victory and Tustin Ranch Rd. 01/07/2025 8 AM 9 Good Warner Avenue 01/07/2025 8 AM 14 Good Warner and Armstrong 01/07/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 8, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/08/2025 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 01/08/2025 8 AM 9 Good Hangar Fenceline - N Center 01/08/2025 8 AM 8 Good Hangar Fenceline - N Corner 01/08/2025 8 AM 8 Good Hangar Fenceline - NE Corner 01/08/2025 8 AM ** ** Hangar Fenceline - NE Side 01/08/2025 8 AM 4 Good Hangar Fenceline - S Corner 01/08/2025 8 AM 8 Good Hangar Fenceline - S Side 01/08/2025 8 AM 18 Good Hangar Fenceline - SW Corner 01/08/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/08/2025 8 AM 5 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/08/2025 8 AM Particulate Matter 5 Level of Concern Good Legacy Road 01/08/2025 8 AM ** ** Moffett and Tustin Ranch 01/08/2025 8 AM 22 Good Valencia and Armstrong 01/08/2025 8 AM 21 Good Valencia and Columbus Square 01/08/2025 8 AM 9 Good Valencia and Legacy 01/08/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/08/2025 8 AM 7 Good Warner Avenue 01/08/2025 8 AM 17 Good Warner and Armstrong 01/08/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 9, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/09/2025 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 01/09/2025 8 AM 10 Good Hangar Fenceline - N Center 01/09/2025 8 AM 11 Good Hangar Fenceline - N Corner 01/09/2025 8 AM 9 Good Hangar Fenceline - NE Corner 01/09/2025 8 AM 9 Good Hangar Fenceline - NE Side 01/09/2025 8 AM ** ** Hangar Fenceline - S Corner 01/09/2025 8 AM 6 Good Hangar Fenceline - S Side 01/09/2025 8 AM ** ** Hangar Fenceline - SW Corner 01/09/2025 8 AM 12 Good Hangar Fenceline - SW Side 01/09/2025 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/09/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/09/2025 8 AM 8 Good Moffett and Tustin Ranch 01/09/2025 8 AM 12 Good Valencia and Armstrong 01/09/2025 8 AM 15 Good Valencia and Columbus Square 01/09/2025 8 AM 9 Good Valencia and Legacy 01/09/2025 8 AM 6 Good Victory and Tustin Ranch Rd. 01/09/2025 8 AM 8 Good Warner Avenue 01/09/2025 8 AM 9 Good Warner and Armstrong 01/09/2025 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 10, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/10/2025 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 01/10/2025 8 AM 11 Good Hangar Fenceline - N Center 01/10/2025 8 AM 11 Good Hangar Fenceline - N Corner 01/10/2025 8 AM 9 Good Hangar Fenceline - NE Corner 01/10/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/10/2025 8 AM 14 Good Hangar Fenceline - S Corner 01/10/2025 8 AM ** ** Hangar Fenceline - S Side 01/10/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/10/2025 8 AM 13 Good Hangar Fenceline - SW Side 01/10/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 01/10/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/10/2025 8 AM 10 Good Moffett and Tustin Ranch 01/10/2025 8 AM 12 Good Valencia and Armstrong 01/10/2025 8 AM 19 Good Valencia and Columbus Square 01/10/2025 8 AM 11 Good Valencia and Legacy 01/10/2025 8 AM 11 Good Victory and Tustin Ranch Rd. 01/10/2025 8 AM 9 Good Warner Avenue 01/10/2025 8 AM 11 Good Warner and Armstrong 01/10/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 11, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/11/2025 8 AM Matter 18 Level of Concern Good Hangar Fenceline - E Side 01/11/2025 8 AM 22 Good Hangar Fenceline - N Center 01/11/2025 8 AM 22 Good Hangar Fenceline - N Corner 01/11/2025 8 AM 19 Good Hangar Fenceline - NE Corner 01/11/2025 8 AM 27 Good Hangar Fenceline - NE Side 01/11/2025 8 AM 22 Good Hangar Fenceline - S Corner 01/11/2025 8 AM 21 Good Hangar Fenceline - S Side 01/11/2025 8 AM 24 Good Hangar Fenceline - SW Corner 01/11/2025 8 AM 27 Good Hangar Fenceline - SW Side 01/11/2025 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/11/2025 8 AM Particulate Matter 17 Level of Concern Good Legacy Road 01/11/2025 8 AM 19 Good Moffett and Tustin Ranch 01/11/2025 8 AM 22 Good Valencia and Armstrong 01/11/2025 8 AM 26 Good Valencia and Columbus Square 01/11/2025 8 AM 22 Good Valencia and Legacy 01/11/2025 8 AM 17 Good Victory and Tustin Ranch Rd. 01/11/2025 8 AM ** ** Warner Avenue 01/11/2025 8 AM 21 Good Warner and Armstrong 01/11/2025 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 12, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/12/2025 8 AM Matter 5 Level of Concern Good Hangar Fenceline - E Side 01/12/2025 8 AM 7 Good Hangar Fenceline - N Center 01/12/2025 8 AM 8 Good Hangar Fenceline - N Corner 01/12/2025 8 AM 6 Good Hangar Fenceline - NE Corner 01/12/2025 8 AM 10 Good Hangar Fenceline - NE Side 01/12/2025 8 AM 12 Good Hangar Fenceline - S Corner 01/12/2025 8 AM ** ** Hangar Fenceline - S Side 01/12/2025 8 AM 7 Good Hangar Fenceline - SW Corner 01/12/2025 8 AM 9 Good Hangar Fenceline - SW Side 01/12/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 01/12/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/12/2025 8 AM 7 Good Moffett and Tustin Ranch 01/12/2025 8 AM 8 Good Valencia and Armstrong 01/12/2025 8 AM 15 Good Valencia and Columbus Square 01/12/2025 8 AM 8 Good Valencia and Legacy 01/12/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/12/2025 8 AM 8 Good Warner Avenue 01/12/2025 8 AM 7 Good Warner and Armstrong 01/12/2025 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 13, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/13/2025 8 AM 2 Good Hangar Fenceline - E Side 01/13/2025 8 AM 2 Good Hangar Fenceline - N Center 01/13/2025 8 AM 2 Good Hangar Fenceline - N Corner 01/13/2025 8 AM 1 Good Hangar Fenceline - NE Corner 01/13/2025 8 AM ** ** Hangar Fenceline - NE Side 01/13/2025 8 AM ** ** Hangar Fenceline - S Corner 01/13/2025 8 AM 2 Good Hangar Fenceline - S Side 01/13/2025 8 AM 2 Good Hangar Fenceline - SW Corner 01/13/2025 8 AM 2 Good Hangar Fenceline - SW Side 01/13/2025 8 AM 4 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/13/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/13/2025 8 AM 2 Good Moffett and Tustin Ranch 01/13/2025 8 AM 3 Good Valencia and Armstrong 01/13/2025 8 AM 4 Good Valencia and Columbus Square 01/13/2025 8 AM ** ** Valencia and Legacy 01/13/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/13/2025 8 AM 4 Good Warner Avenue 01/13/2025 8 AM 2 Good Warner and Armstrong 01/13/2025 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 14, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/14/2025 8 AM 2 Good Hangar Fenceline - E Side 01/14/2025 8 AM 3 Good Hangar Fenceline - N Center 01/14/2025 8 AM 3 Good Hangar Fenceline - N Corner 01/14/2025 8 AM 2 Good Hangar Fenceline - NE Corner 01/14/2025 8 AM 3 Good Hangar Fenceline - NE Side 01/14/2025 8 AM 2 Good Hangar Fenceline - S Corner 01/14/2025 8 AM 3 Good Hangar Fenceline - S Side 01/14/2025 8 AM ** ** Hangar Fenceline - SW Corner 01/14/2025 8 AM 4 Good Hangar Fenceline - SW Side 01/14/2025 8 AM 4 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/14/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/14/2025 8 AM 2 Good Moffett and Tustin Ranch 01/14/2025 8 AM 4 Good Valencia and Armstrong 01/14/2025 8 AM 4 Good Valencia and Columbus Square 01/14/2025 8 AM 2 Good Valencia and Legacy 01/14/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/14/2025 8 AM 5 Good Warner Avenue 01/14/2025 8 AM 3 Good Warner and Armstrong 01/14/2025 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 15, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/15/2025 8 AM Matter 6 Level of Concern Good Hangar Fenceline - E Side 01/15/2025 8 AM 9 Good Hangar Fenceline - N Center 01/15/2025 8 AM 8 Good Hangar Fenceline - N Corner 01/15/2025 8 AM 7 Good Hangar Fenceline - NE Corner 01/15/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/15/2025 8 AM 8 Good Hangar Fenceline - S Corner 01/15/2025 8 AM 8 Good Hangar Fenceline - S Side 01/15/2025 8 AM 9 Good Hangar Fenceline - SW Corner 01/15/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/15/2025 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/15/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/15/2025 8 AM 7 Good Moffett and Tustin Ranch 01/15/2025 8 AM 10 Good Valencia and Armstrong 01/15/2025 8 AM 9 Good Valencia and Columbus Square 01/15/2025 8 AM 6 Good Valencia and Legacy 01/15/2025 8 AM 5 Good Victory and Tustin Ranch Rd. 01/15/2025 8 AM 10 Good Warner Avenue 01/15/2025 8 AM 9 Good Warner and Armstrong 01/15/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 16, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/16/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/16/2025 8 AM 9 Good Hangar Fenceline - N Center 01/16/2025 8 AM 9 Good Hangar Fenceline - N Corner 01/16/2025 8 AM 9 Good Hangar Fenceline - NE Corner 01/16/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/16/2025 8 AM 11 Good Hangar Fenceline - S Corner 01/16/2025 8 AM 9 Good Hangar Fenceline - S Side 01/16/2025 8 AM 8 Good Hangar Fenceline - SW Corner 01/16/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/16/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/16/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/16/2025 8 AM ** ** Moffett and Tustin Ranch 01/16/2025 8 AM 10 Good Valencia and Armstrong 01/16/2025 8 AM 12 Good Valencia and Columbus Square 01/16/2025 8 AM 8 Good Valencia and Legacy 01/16/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 01/16/2025 8 AM 11 Good Warner Avenue 01/16/2025 8 AM 8 Good Warner and Armstrong 01/16/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 17, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/17/2025 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 01/17/2025 8 AM 12 Good Hangar Fenceline - N Center 01/17/2025 8 AM 13 Good Hangar Fenceline - N Corner 01/17/2025 8 AM 10 Good Hangar Fenceline - NE Corner 01/17/2025 8 AM 15 Good Hangar Fenceline - NE Side 01/17/2025 8 AM 13 Good Hangar Fenceline - S Corner 01/17/2025 8 AM 11 Good Hangar Fenceline - S Side 01/17/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/17/2025 8 AM 15 Good Hangar Fenceline - SW Side 01/17/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 01/17/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/17/2025 8 AM 10 Good Moffett and Tustin Ranch 01/17/2025 8 AM 12 Good Valencia and Armstrong 01/17/2025 8 AM 12 Good Valencia and Columbus Square 01/17/2025 8 AM ** ** Valencia and Legacy 01/17/2025 8 AM 10 Good Victory and Tustin Ranch Rd. 01/17/2025 8 AM 12 Good Warner Avenue 01/17/2025 8 AM 10 Good Warner and Armstrong 01/17/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 18, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/18/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/18/2025 8 AM 11 Good Hangar Fenceline - N Center 01/18/2025 8 AM 11 Good Hangar Fenceline - N Corner 01/18/2025 8 AM ** ** Hangar Fenceline - NE Corner 01/18/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/18/2025 8 AM 11 Good Hangar Fenceline - S Corner 01/18/2025 8 AM 8 Good Hangar Fenceline - S Side 01/18/2025 8 AM 9 Good Hangar Fenceline - SW Corner 01/18/2025 8 AM 12 Good Hangar Fenceline - SW Side 01/18/2025 8 AM 34 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/18/2025 8 AM Particulate Matter 14 Level of Concern Good Legacy Road 01/18/2025 8 AM 9 Good Moffett and Tustin Ranch 01/18/2025 8 AM 10 Good Valencia and Armstrong 01/18/2025 8 AM 13 Good Valencia and Columbus Square 01/18/2025 8 AM 10 Good Valencia and Legacy 01/18/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 01/18/2025 8 AM 11 Good Warner Avenue 01/18/2025 8 AM 10 Good Warner and Armstrong 01/18/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 19, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/19/2025 8 AM Matter 22 Level of Concern Good Hangar Fenceline - E Side 01/19/2025 8 AM 26 Good Hangar Fenceline - N Center 01/19/2025 8 AM 30 Good Hangar Fenceline - N Corner 01/19/2025 8 AM 19 Good Hangar Fenceline - NE Corner 01/19/2025 8 AM 27 Good Hangar Fenceline - NE Side 01/19/2025 8 AM 27 Good Hangar Fenceline - S Corner 01/19/2025 8 AM 22 Good Hangar Fenceline - S Side 01/19/2025 8 AM 25 Good Hangar Fenceline - SW Corner 01/19/2025 8 AM 36 Good Hangar Fenceline - SW Side 01/19/2025 8 AM 50 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/19/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/19/2025 8 AM 28 Good Moffett and Tustin Ranch 01/19/2025 8 AM 25 Good Valencia and Armstrong 01/19/2025 8 AM 29 Good Valencia and Columbus Square 01/19/2025 8 AM 27 Good Valencia and Legacy 01/19/2025 8 AM 19 Good Victory and Tustin Ranch Rd. 01/19/2025 8 AM 25 Good Warner Avenue 01/19/2025 8 AM 26 Good Warner and Armstrong 01/19/2025 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 20, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/20/2025 8 AM Matter 73 Level of Concern Moderate Hangar Fenceline - E Side 01/20/2025 8 AM 50 Good Hangar Fenceline - N Center 01/20/2025 8 AM 56 Moderate Hangar Fenceline - N Corner 01/20/2025 8 AM 41 Good Hangar Fenceline - NE Corner 01/20/2025 8 AM 55 Moderate Hangar Fenceline - NE Side 01/20/2025 8 AM 53 Good Hangar Fenceline - S Corner 01/20/2025 8 AM ** ** Hangar Fenceline - S Side 01/20/2025 8 AM 50 Good Hangar Fenceline - SW Corner 01/20/2025 8 AM 75 Moderate Hangar Fenceline - SW Side 01/20/2025 8 AM 73 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/20/2025 8 AM Particulate Matter 39 Level of Concern Good Legacy Road 01/20/2025 8 AM 51 Good Moffett and Tustin Ranch 01/20/2025 8 AM 46 Good Valencia and Armstrong 01/20/2025 8 AM 56 Moderate Valencia and Columbus Square 01/20/2025 8 AM 56 Moderate Valencia and Legacy 01/20/2025 8 AM 40 Good Victory and Tustin Ranch Rd. 01/20/2025 8 AM 41 Good Warner Avenue 01/20/2025 8 AM 49 Good Warner and Armstrong 01/20/2025 8 AM 45 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 21, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/21/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/21/2025 8 AM 11 Good Hangar Fenceline - N Center 01/21/2025 8 AM 14 Good Hangar Fenceline - N Corner 01/21/2025 8 AM 11 Good Hangar Fenceline - NE Corner 01/21/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/21/2025 8 AM 14 Good Hangar Fenceline - S Corner 01/21/2025 8 AM 11 Good Hangar Fenceline - S Side 01/21/2025 8 AM 12 Good Hangar Fenceline - SW Corner 01/21/2025 8 AM 18 Good Hangar Fenceline - SW Side 01/21/2025 8 AM 34 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/21/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/21/2025 8 AM ** ** Moffett and Tustin Ranch 01/21/2025 8 AM 16 Good Valencia and Armstrong 01/21/2025 8 AM 25 Good Valencia and Columbus Square 01/21/2025 8 AM 12 Good Valencia and Legacy 01/21/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 01/21/2025 8 AM 12 Good Warner Avenue 01/21/2025 8 AM 16 Good Warner and Armstrong 01/21/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 22, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. Columbus Square Park PeriodLocation 24-Hour Ending 01/22/2025 8 AM Particulate Matter 8 Level of Concern Good Hangar Fenceline - E Side 01/22/2025 8 AM 2 Good Hangar Fenceline - N Center 01/22/2025 8 AM 10 Good Hangar Fenceline - N Corner 01/22/2025 8 AM 8 Good Hangar Fenceline - NE Corner 01/22/2025 8 AM 2 Good Hangar Fenceline - NE Side 01/22/2025 8 AM 9 Good Hangar Fenceline - S Corner 01/22/2025 8 AM 8 Good Hangar Fenceline - S Side 01/22/2025 8 AM 7 Good Hangar Fenceline - SW Corner 01/22/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/22/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/22/2025 8 AM Particulate Matter 5 Level of Concern Good Legacy Road 01/22/2025 8 AM 8 Good Moffett and Tustin Ranch 01/22/2025 8 AM 12 Good Valencia and Armstrong 01/22/2025 8 AM 12 Good Valencia and Columbus Square 01/22/2025 8 AM 7 Good Valencia and Legacy 01/22/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 01/22/2025 8 AM 8 Good Warner Avenue 01/22/2025 8 AM 9 Good Warner and Armstrong 01/22/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 23, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/23/2025 8 AM 18 Good Hangar Fenceline - E Side 01/23/2025 8 AM ** ** Hangar Fenceline - N Center 01/23/2025 8 AM 27 Good Hangar Fenceline - N Corner 01/23/2025 8 AM 23 Good Hangar Fenceline - NE Corner 01/23/2025 8 AM ** ** Hangar Fenceline - NE Side 01/23/2025 8 AM 28 Good Hangar Fenceline - S Corner 01/23/2025 8 AM 28 Good Hangar Fenceline - S Side 01/23/2025 8 AM 26 Good Hangar Fenceline - SW Corner 01/23/2025 8 AM 36 Good Hangar Fenceline - SW Side 01/23/2025 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/23/2025 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 01/23/2025 8 AM 28 Good Moffett and Tustin Ranch 01/23/2025 8 AM 36 Good Valencia and Armstrong 01/23/2025 8 AM 35 Good Valencia and Columbus Square 01/23/2025 8 AM 22 Good Valencia and Legacy 01/23/2025 8 AM 22 Good Victory and Tustin Ranch Rd. 01/23/2025 8 AM 46 Good Warner Avenue 01/23/2025 8 AM 21 Good Warner and Armstrong 01/23/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 24, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/24/2025 8 AM Matter 5 Level of Concern Good Hangar Fenceline - E Side 01/24/2025 8 AM ** ** Hangar Fenceline - N Center 01/24/2025 8 AM 7 Good Hangar Fenceline - N Corner 01/24/2025 8 AM 7 Good Hangar Fenceline - NE Corner 01/24/2025 8 AM ** ** Hangar Fenceline - NE Side 01/24/2025 8 AM 6 Good Hangar Fenceline - S Corner 01/24/2025 8 AM 6 Good Hangar Fenceline - S Side 01/24/2025 8 AM 4 Good Hangar Fenceline - SW Corner 01/24/2025 8 AM 8 Good Hangar Fenceline - SW Side 01/24/2025 8 AM 4 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/24/2025 8 AM Particulate Matter 3 Level of Concern Good Legacy Road 01/24/2025 8 AM 4 Good Moffett and Tustin Ranch 01/24/2025 8 AM ** ** Valencia and Armstrong 01/24/2025 8 AM 7 Good Valencia and Columbus Square 01/24/2025 8 AM 3 Good Valencia and Legacy 01/24/2025 8 AM 3 Good Victory and Tustin Ranch Rd. 01/24/2025 8 AM 6 Good Warner Avenue 01/24/2025 8 AM 6 Good Warner and Armstrong 01/24/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 25, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/25/2025 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 01/25/2025 8 AM 3 Good Hangar Fenceline - N Center 01/25/2025 8 AM 13 Good Hangar Fenceline - N Corner 01/25/2025 8 AM 11 Good Hangar Fenceline - NE Corner 01/25/2025 8 AM 2 Good Hangar Fenceline - NE Side 01/25/2025 8 AM 11 Good Hangar Fenceline - S Corner 01/25/2025 8 AM 11 Good Hangar Fenceline - S Side 01/25/2025 8 AM 9 Good Hangar Fenceline - SW Corner 01/25/2025 8 AM 14 Good Hangar Fenceline - SW Side 01/25/2025 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/25/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/25/2025 8 AM 8 Good Moffett and Tustin Ranch 01/25/2025 8 AM 13 Good Valencia and Armstrong 01/25/2025 8 AM 12 Good Valencia and Columbus Square 01/25/2025 8 AM 9 Good Valencia and Legacy 01/25/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 01/25/2025 8 AM ** ** Warner Avenue 01/25/2025 8 AM 8 Good Warner and Armstrong 01/25/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 26, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/26/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 01/26/2025 8 AM ** ** Hangar Fenceline - N Center 01/26/2025 8 AM 15 Good Hangar Fenceline - N Corner 01/26/2025 8 AM 12 Good Hangar Fenceline - NE Corner 01/26/2025 8 AM ** ** Hangar Fenceline - NE Side 01/26/2025 8 AM 14 Good Hangar Fenceline - S Corner 01/26/2025 8 AM 12 Good Hangar Fenceline - S Side 01/26/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/26/2025 8 AM 16 Good Hangar Fenceline - SW Side 01/26/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/26/2025 8 AM Particulate Matter 9 Level of Concern Good Legacy Road 01/26/2025 8 AM 10 Good Moffett and Tustin Ranch 01/26/2025 8 AM 13 Good Valencia and Armstrong 01/26/2025 8 AM ** ** Valencia and Columbus Square 01/26/2025 8 AM 13 Good Valencia and Legacy 01/26/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 01/26/2025 8 AM ** ** Warner Avenue 01/26/2025 8 AM 7 Good Warner and Armstrong 01/26/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 27, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/27/2025 8 AM 4 Good Hangar Fenceline - E Side 01/27/2025 8 AM ** ** Hangar Fenceline - N Center 01/27/2025 8 AM 6 Good Hangar Fenceline - N Corner 01/27/2025 8 AM 4 Good Hangar Fenceline - NE Corner 01/27/2025 8 AM ** ** Hangar Fenceline - NE Side 01/27/2025 8 AM 5 Good Hangar Fenceline - S Corner 01/27/2025 8 AM ** ** Hangar Fenceline - S Side 01/27/2025 8 AM 3 Good Hangar Fenceline - SW Corner 01/27/2025 8 AM ** ** Hangar Fenceline - SW Side 01/27/2025 8 AM 3 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/27/2025 8 AM Particulate Matter 3 Level of Concern Good Legacy Road 01/27/2025 8 AM 4 Good Moffett and Tustin Ranch 01/27/2025 8 AM 4 Good Valencia and Armstrong 01/27/2025 8 AM 5 Good Valencia and Columbus Square 01/27/2025 8 AM 5 Good Valencia and Legacy 01/27/2025 8 AM 3 Good Victory and Tustin Ranch Rd. 01/27/2025 8 AM ** ** Warner Avenue 01/27/2025 8 AM 3 Good Warner and Armstrong 01/27/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 28, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/28/2025 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 01/28/2025 8 AM ** ** Hangar Fenceline - N Center 01/28/2025 8 AM 14 Good Hangar Fenceline - N Corner 01/28/2025 8 AM 10 Good Hangar Fenceline - NE Corner 01/28/2025 8 AM ** ** Hangar Fenceline - NE Side 01/28/2025 8 AM 12 Good Hangar Fenceline - S Corner 01/28/2025 8 AM ** ** Hangar Fenceline - S Side 01/28/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/28/2025 8 AM 16 Good Hangar Fenceline - SW Side 01/28/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/28/2025 8 AM Particulate Matter 7 Level of Concern Good Legacy Road 01/28/2025 8 AM 11 Good Moffett and Tustin Ranch 01/28/2025 8 AM ** ** Valencia and Armstrong 01/28/2025 8 AM 12 Good Valencia and Columbus Square 01/28/2025 8 AM ** ** Valencia and Legacy 01/28/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 01/28/2025 8 AM ** ** Warner Avenue 01/28/2025 8 AM 5 Good Warner and Armstrong 01/28/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 29, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/29/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/29/2025 8 AM ** ** Hangar Fenceline - N Center 01/29/2025 8 AM 24 Good Hangar Fenceline - N Corner 01/29/2025 8 AM 15 Good Hangar Fenceline - NE Corner 01/29/2025 8 AM ** ** Hangar Fenceline - NE Side 01/29/2025 8 AM ** ** Hangar Fenceline - S Corner 01/29/2025 8 AM 18 Good Hangar Fenceline - S Side 01/29/2025 8 AM ** ** Hangar Fenceline - SW Corner 01/29/2025 8 AM 25 Good Hangar Fenceline - SW Side 01/29/2025 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/29/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/29/2025 8 AM 17 Good Moffett and Tustin Ranch 01/29/2025 8 AM 17 Good Valencia and Armstrong 01/29/2025 8 AM 19 Good Valencia and Columbus Square 01/29/2025 8 AM 19 Good Valencia and Legacy 01/29/2025 8 AM 14 Good Victory and Tustin Ranch Rd. 01/29/2025 8 AM 15 Good Warner Avenue 01/29/2025 8 AM 7 Good Warner and Armstrong 01/29/2025 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 30, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/30/2025 8 AM 23 Good Hangar Fenceline - E Side 01/30/2025 8 AM ** ** Hangar Fenceline - N Center 01/30/2025 8 AM 27 Good Hangar Fenceline - N Corner 01/30/2025 8 AM 20 Good Hangar Fenceline - NE Corner 01/30/2025 8 AM ** ** Hangar Fenceline - NE Side 01/30/2025 8 AM 23 Good Hangar Fenceline - S Corner 01/30/2025 8 AM 23 Good Hangar Fenceline - S Side 01/30/2025 8 AM 21 Good Hangar Fenceline - SW Corner 01/30/2025 8 AM 31 Good Hangar Fenceline - SW Side 01/30/2025 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/30/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/30/2025 8 AM 21 Good Moffett and Tustin Ranch 01/30/2025 8 AM 21 Good Valencia and Armstrong 01/30/2025 8 AM 25 Good Valencia and Columbus Square 01/30/2025 8 AM 23 Good Valencia and Legacy 01/30/2025 8 AM 19 Good Victory and Tustin Ranch Rd. 01/30/2025 8 AM ** ** Warner Avenue 01/30/2025 8 AM 16 Good Warner and Armstrong 01/30/2025 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 31, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/31/2025 8 AM 20 Good Hangar Fenceline - E Side 01/31/2025 8 AM ** ** Hangar Fenceline - N Center 01/31/2025 8 AM 27 Good Hangar Fenceline - N Corner 01/31/2025 8 AM 17 Good Hangar Fenceline - NE Corner 01/31/2025 8 AM ** ** Hangar Fenceline - NE Side 01/31/2025 8 AM 21 Good Hangar Fenceline - S Corner 01/31/2025 8 AM 20 Good Hangar Fenceline - S Side 01/31/2025 8 AM 18 Good Hangar Fenceline - SW Corner 01/31/2025 8 AM 28 Good Hangar Fenceline - SW Side 01/31/2025 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/31/2025 8 AM Particulate Matter 10 Level of Concern Good Legacy Road 01/31/2025 8 AM 17 Good Moffett and Tustin Ranch 01/31/2025 8 AM 19 Good Valencia and Armstrong 01/31/2025 8 AM 21 Good Valencia and Columbus Square 01/31/2025 8 AM 20 Good Valencia and Legacy 01/31/2025 8 AM 16 Good Victory and Tustin Ranch Rd. 01/31/2025 8 AM 17 Good Warner Avenue 01/31/2025 8 AM 17 Good Warner and Armstrong 01/31/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 1, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 02/01/2025 8 AM 52 Good Hangar Fenceline - E Side 02/01/2025 8 AM ** ** Hangar Fenceline - N Center 02/01/2025 8 AM 61 Moderate Hangar Fenceline - N Corner 02/01/2025 8 AM 43 Good Hangar Fenceline - NE Corner 02/01/2025 8 AM ** ** Hangar Fenceline - NE Side 02/01/2025 8 AM 51 Good Hangar Fenceline - S Corner 02/01/2025 8 AM 51 Good Hangar Fenceline - S Side 02/01/2025 8 AM 48 Good Hangar Fenceline - SW Corner 02/01/2025 8 AM 75 Moderate Hangar Fenceline - SW Side 02/01/2025 8 AM 51 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/01/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/01/2025 8 AM ** ** Moffett and Tustin Ranch 02/01/2025 8 AM 47 Good Valencia and Armstrong 02/01/2025 8 AM 53 Good Valencia and Columbus Square 02/01/2025 8 AM 52 Good Valencia and Legacy 02/01/2025 8 AM 41 Good Victory and Tustin Ranch Rd. 02/01/2025 8 AM ** ** Warner Avenue 02/01/2025 8 AM 33 Good Warner and Armstrong 02/01/2025 8 AM 40 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 2, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/02/2025 8 AM Matter 50 Level of Concern Good Hangar Fenceline - E Side 02/02/2025 8 AM 56 Moderate Hangar Fenceline - N Center 02/02/2025 8 AM ** ** Hangar Fenceline - N Corner 02/02/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/02/2025 8 AM ** ** Hangar Fenceline - NE Side 02/02/2025 8 AM 49 Good Hangar Fenceline - S Corner 02/02/2025 8 AM ** ** Hangar Fenceline - S Side 02/02/2025 8 AM 46 Good Hangar Fenceline - SW Corner 02/02/2025 8 AM ** ** Hangar Fenceline - SW Side 02/02/2025 8 AM 50 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/02/2025 8 AM Particulate Matter 30 Level of Concern Good Legacy Road 02/02/2025 8 AM 41 Good Moffett and Tustin Ranch 02/02/2025 8 AM 44 Good Valencia and Armstrong 02/02/2025 8 AM 51 Good Valencia and Columbus Square 02/02/2025 8 AM 50 Good Valencia and Legacy 02/02/2025 8 AM 44 Good Victory and Tustin Ranch Rd. 02/02/2025 8 AM 48 Good Warner Avenue 02/02/2025 8 AM ** ** Warner and Armstrong 02/02/2025 8 AM 39 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 3, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/03/2025 8 AM Matter 76 Level of Concern Moderate Hangar Fenceline - E Side 02/03/2025 8 AM 92 Moderate Hangar Fenceline - N Center 02/03/2025 8 AM 90 Moderate Hangar Fenceline - N Corner 02/03/2025 8 AM 58 Moderate Hangar Fenceline - NE Corner 02/03/2025 8 AM ** ** Hangar Fenceline - NE Side 02/03/2025 8 AM 76 Moderate Hangar Fenceline - S Corner 02/03/2025 8 AM ** ** Hangar Fenceline - S Side 02/03/2025 8 AM 57 Moderate Hangar Fenceline - SW Corner 02/03/2025 8 AM 102 Moderate Hangar Fenceline - SW Side 02/03/2025 8 AM 77 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 02/03/2025 8 AM Particulate Matter 49 Level of Concern Good Legacy Road 02/03/2025 8 AM 58 Moderate Moffett and Tustin Ranch 02/03/2025 8 AM 62 Moderate Valencia and Armstrong 02/03/2025 8 AM 71 Moderate Valencia and Columbus Square 02/03/2025 8 AM 72 Moderate Valencia and Legacy 02/03/2025 8 AM 50 Good Victory and Tustin Ranch Rd. 02/03/2025 8 AM 65 Moderate Warner Avenue 02/03/2025 8 AM 50 Good Warner and Armstrong 02/03/2025 8 AM 38 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 4, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/04/2025 8 AM Matter 52 Level of Concern Good Hangar Fenceline - E Side 02/04/2025 8 AM 64 Moderate Hangar Fenceline - N Center 02/04/2025 8 AM 58 Moderate Hangar Fenceline - N Corner 02/04/2025 8 AM 44 Good Hangar Fenceline - NE Corner 02/04/2025 8 AM 56 Moderate Hangar Fenceline - NE Side 02/04/2025 8 AM 54 Good Hangar Fenceline - S Corner 02/04/2025 8 AM 52 Good Hangar Fenceline - S Side 02/04/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/04/2025 8 AM 81 Moderate Hangar Fenceline - SW Side 02/04/2025 8 AM 54 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/04/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/04/2025 8 AM 38 Good Moffett and Tustin Ranch 02/04/2025 8 AM ** ** Valencia and Armstrong 02/04/2025 8 AM 53 Good Valencia and Columbus Square 02/04/2025 8 AM 55 Moderate Valencia and Legacy 02/04/2025 8 AM 44 Good Victory and Tustin Ranch Rd. 02/04/2025 8 AM 51 Good Warner Avenue 02/04/2025 8 AM 37 Good Warner and Armstrong 02/04/2025 8 AM 39 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 5, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/05/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 02/05/2025 8 AM 11 Good Hangar Fenceline - N Center 02/05/2025 8 AM 8 Good Hangar Fenceline - N Corner 02/05/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/05/2025 8 AM 9 Good Hangar Fenceline - NE Side 02/05/2025 8 AM 8 Good Hangar Fenceline - S Corner 02/05/2025 8 AM 9 Good Hangar Fenceline - S Side 02/05/2025 8 AM 8 Good Hangar Fenceline - SW Corner 02/05/2025 8 AM 12 Good Hangar Fenceline - SW Side 02/05/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 02/05/2025 8 AM Particulate Matter 5 Level of Concern Good Legacy Road 02/05/2025 8 AM 7 Good Moffett and Tustin Ranch 02/05/2025 8 AM 8 Good Valencia and Armstrong 02/05/2025 8 AM 9 Good Valencia and Columbus Square 02/05/2025 8 AM 7 Good Valencia and Legacy 02/05/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 02/05/2025 8 AM 7 Good Warner Avenue 02/05/2025 8 AM 7 Good Warner and Armstrong 02/05/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 6, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/06/2025 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 02/06/2025 8 AM 14 Good Hangar Fenceline - N Center 02/06/2025 8 AM 10 Good Hangar Fenceline - N Corner 02/06/2025 8 AM 9 Good Hangar Fenceline - NE Corner 02/06/2025 8 AM 12 Good Hangar Fenceline - NE Side 02/06/2025 8 AM 11 Good Hangar Fenceline - S Corner 02/06/2025 8 AM 11 Good Hangar Fenceline - S Side 02/06/2025 8 AM 9 Good Hangar Fenceline - SW Corner 02/06/2025 8 AM 15 Good Hangar Fenceline - SW Side 02/06/2025 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/06/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/06/2025 8 AM ** ** Moffett and Tustin Ranch 02/06/2025 8 AM 10 Good Valencia and Armstrong 02/06/2025 8 AM 11 Good Valencia and Columbus Square 02/06/2025 8 AM 10 Good Valencia and Legacy 02/06/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 02/06/2025 8 AM 9 Good Warner Avenue 02/06/2025 8 AM 8 Good Warner and Armstrong 02/06/2025 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 7, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/07/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/07/2025 8 AM 4 Good Hangar Fenceline - N Center 02/07/2025 8 AM 2 Good Hangar Fenceline - N Corner 02/07/2025 8 AM 2 Good Hangar Fenceline - NE Corner 02/07/2025 8 AM 4 Good Hangar Fenceline - NE Side 02/07/2025 8 AM 2 Good Hangar Fenceline - S Corner 02/07/2025 8 AM 2 Good Hangar Fenceline - S Side 02/07/2025 8 AM 2 Good Hangar Fenceline - SW Corner 02/07/2025 8 AM 2 Good Hangar Fenceline - SW Side 02/07/2025 8 AM 3 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/07/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/07/2025 8 AM ** ** Moffett and Tustin Ranch 02/07/2025 8 AM 2 Good Valencia and Armstrong 02/07/2025 8 AM 2 Good Valencia and Columbus Square 02/07/2025 8 AM ** ** Valencia and Legacy 02/07/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/07/2025 8 AM 1 Good Warner Avenue 02/07/2025 8 AM 1 Good Warner and Armstrong 02/07/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 8, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/08/2025 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 02/08/2025 8 AM 12 Good Hangar Fenceline - N Center 02/08/2025 8 AM 6 Good Hangar Fenceline - N Corner 02/08/2025 8 AM 6 Good Hangar Fenceline - NE Corner 02/08/2025 8 AM 7 Good Hangar Fenceline - NE Side 02/08/2025 8 AM 7 Good Hangar Fenceline - S Corner 02/08/2025 8 AM 7 Good Hangar Fenceline - S Side 02/08/2025 8 AM 4 Good Hangar Fenceline - SW Corner 02/08/2025 8 AM 8 Good Hangar Fenceline - SW Side 02/08/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/08/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/08/2025 8 AM 8 Good Moffett and Tustin Ranch 02/08/2025 8 AM 7 Good Valencia and Armstrong 02/08/2025 8 AM 7 Good Valencia and Columbus Square 02/08/2025 8 AM 6 Good Valencia and Legacy 02/08/2025 8 AM 4 Good Victory and Tustin Ranch Rd. 02/08/2025 8 AM 6 Good Warner Avenue 02/08/2025 8 AM 5 Good Warner and Armstrong 02/08/2025 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 9, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/09/2025 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 02/09/2025 8 AM 25 Good Hangar Fenceline - N Center 02/09/2025 8 AM 18 Good Hangar Fenceline - N Corner 02/09/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/09/2025 8 AM 19 Good Hangar Fenceline - NE Side 02/09/2025 8 AM 18 Good Hangar Fenceline - S Corner 02/09/2025 8 AM 17 Good Hangar Fenceline - S Side 02/09/2025 8 AM 14 Good Hangar Fenceline - SW Corner 02/09/2025 8 AM 24 Good Hangar Fenceline - SW Side 02/09/2025 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/09/2025 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 02/09/2025 8 AM 23 Good Moffett and Tustin Ranch 02/09/2025 8 AM 17 Good Valencia and Armstrong 02/09/2025 8 AM 19 Good Valencia and Columbus Square 02/09/2025 8 AM 18 Good Valencia and Legacy 02/09/2025 8 AM 14 Good Victory and Tustin Ranch Rd. 02/09/2025 8 AM 17 Good Warner Avenue 02/09/2025 8 AM 14 Good Warner and Armstrong 02/09/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 10, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/10/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/10/2025 8 AM ** ** Hangar Fenceline - N Center 02/10/2025 8 AM 25 Good Hangar Fenceline - N Corner 02/10/2025 8 AM 22 Good Hangar Fenceline - NE Corner 02/10/2025 8 AM 28 Good Hangar Fenceline - NE Side 02/10/2025 8 AM 26 Good Hangar Fenceline - S Corner 02/10/2025 8 AM 26 Good Hangar Fenceline - S Side 02/10/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/10/2025 8 AM 36 Good Hangar Fenceline - SW Side 02/10/2025 8 AM 28 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/10/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 02/10/2025 8 AM ** ** Moffett and Tustin Ranch 02/10/2025 8 AM 25 Good Valencia and Armstrong 02/10/2025 8 AM 27 Good Valencia and Columbus Square 02/10/2025 8 AM 25 Good Valencia and Legacy 02/10/2025 8 AM 21 Good Victory and Tustin Ranch Rd. 02/10/2025 8 AM 25 Good Warner Avenue 02/10/2025 8 AM 19 Good Warner and Armstrong 02/10/2025 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 11, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/11/2025 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 02/11/2025 8 AM 11 Good Hangar Fenceline - N Center 02/11/2025 8 AM ** ** Hangar Fenceline - N Corner 02/11/2025 8 AM 7 Good Hangar Fenceline - NE Corner 02/11/2025 8 AM ** ** Hangar Fenceline - NE Side 02/11/2025 8 AM 8 Good Hangar Fenceline - S Corner 02/11/2025 8 AM 7 Good Hangar Fenceline - S Side 02/11/2025 8 AM 5 Good Hangar Fenceline - SW Corner 02/11/2025 8 AM ** ** Hangar Fenceline - SW Side 02/11/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/11/2025 8 AM Particulate Matter 4 Level of Concern Good Legacy Road 02/11/2025 8 AM 9 Good Moffett and Tustin Ranch 02/11/2025 8 AM 8 Good Valencia and Armstrong 02/11/2025 8 AM 9 Good Valencia and Columbus Square 02/11/2025 8 AM ** ** Valencia and Legacy 02/11/2025 8 AM 6 Good Victory and Tustin Ranch Rd. 02/11/2025 8 AM 7 Good Warner Avenue 02/11/2025 8 AM 5 Good Warner and Armstrong 02/11/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 12, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/12/2025 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 02/12/2025 8 AM 13 Good Hangar Fenceline - N Center 02/12/2025 8 AM 7 Good Hangar Fenceline - N Corner 02/12/2025 8 AM 8 Good Hangar Fenceline - NE Corner 02/12/2025 8 AM ** ** Hangar Fenceline - NE Side 02/12/2025 8 AM 9 Good Hangar Fenceline - S Corner 02/12/2025 8 AM 9 Good Hangar Fenceline - S Side 02/12/2025 8 AM 7 Good Hangar Fenceline - SW Corner 02/12/2025 8 AM 11 Good Hangar Fenceline - SW Side 02/12/2025 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/12/2025 8 AM Particulate Matter 4 Level of Concern Good Legacy Road 02/12/2025 8 AM ** ** Moffett and Tustin Ranch 02/12/2025 8 AM 9 Good Valencia and Armstrong 02/12/2025 8 AM 10 Good Valencia and Columbus Square 02/12/2025 8 AM ** ** Valencia and Legacy 02/12/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 02/12/2025 8 AM 8 Good Warner Avenue 02/12/2025 8 AM ** ** Warner and Armstrong 02/12/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 13, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 02/13/2025 8 AM 2 Good Hangar Fenceline - E Side 02/13/2025 8 AM 4 Good Hangar Fenceline - N Center 02/13/2025 8 AM ** ** Hangar Fenceline - N Corner 02/13/2025 8 AM 1 Good Hangar Fenceline - NE Corner 02/13/2025 8 AM ** ** Hangar Fenceline - NE Side 02/13/2025 8 AM 2 Good Hangar Fenceline - S Corner 02/13/2025 8 AM 1 Good Hangar Fenceline - S Side 02/13/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/13/2025 8 AM 2 Good Hangar Fenceline - SW Side 02/13/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 02/13/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/13/2025 8 AM ** ** Moffett and Tustin Ranch 02/13/2025 8 AM 2 Good Valencia and Armstrong 02/13/2025 8 AM 2 Good Valencia and Columbus Square 02/13/2025 8 AM ** ** Valencia and Legacy 02/13/2025 8 AM 1 Good Victory and Tustin Ranch Rd. 02/13/2025 8 AM ** ** Warner Avenue 02/13/2025 8 AM 1 Good Warner and Armstrong 02/13/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 14, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/14/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 02/14/2025 8 AM 14 Good Hangar Fenceline - N Center 02/14/2025 8 AM 7 Good Hangar Fenceline - N Corner 02/14/2025 8 AM 9 Good Hangar Fenceline - NE Corner 02/14/2025 8 AM 17 Good Hangar Fenceline - NE Side 02/14/2025 8 AM ** ** Hangar Fenceline - S Corner 02/14/2025 8 AM ** ** Hangar Fenceline - S Side 02/14/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/14/2025 8 AM 10 Good Hangar Fenceline - SW Side 02/14/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 02/14/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/14/2025 8 AM 20 Good Moffett and Tustin Ranch 02/14/2025 8 AM 11 Good Valencia and Armstrong 02/14/2025 8 AM 11 Good Valencia and Columbus Square 02/14/2025 8 AM 9 Good Valencia and Legacy 02/14/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/14/2025 8 AM 8 Good Warner Avenue 02/14/2025 8 AM 7 Good Warner and Armstrong 02/14/2025 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 15, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/15/2025 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 02/15/2025 8 AM 17 Good Hangar Fenceline - N Center 02/15/2025 8 AM 9 Good Hangar Fenceline - N Corner 02/15/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/15/2025 8 AM 16 Good Hangar Fenceline - NE Side 02/15/2025 8 AM 13 Good Hangar Fenceline - S Corner 02/15/2025 8 AM 5 Good Hangar Fenceline - S Side 02/15/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/15/2025 8 AM 14 Good Hangar Fenceline - SW Side 02/15/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/15/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/15/2025 8 AM ** ** Moffett and Tustin Ranch 02/15/2025 8 AM 16 Good Valencia and Armstrong 02/15/2025 8 AM 14 Good Valencia and Columbus Square 02/15/2025 8 AM 12 Good Valencia and Legacy 02/15/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 02/15/2025 8 AM 10 Good Warner Avenue 02/15/2025 8 AM ** ** Warner and Armstrong 02/15/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 16, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/16/2025 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 02/16/2025 8 AM 16 Good Hangar Fenceline - N Center 02/16/2025 8 AM 9 Good Hangar Fenceline - N Corner 02/16/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/16/2025 8 AM 10 Good Hangar Fenceline - NE Side 02/16/2025 8 AM ** ** Hangar Fenceline - S Corner 02/16/2025 8 AM ** ** Hangar Fenceline - S Side 02/16/2025 8 AM 11 Good Hangar Fenceline - SW Corner 02/16/2025 8 AM 16 Good Hangar Fenceline - SW Side 7 02/16/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/16/2025 8 AM Particulate Matter 6 Level of Concern Good Legacy Road 02/16/2025 8 AM ** ** Moffett and Tustin Ranch 02/16/2025 8 AM 18 Good Valencia and Armstrong 02/16/2025 8 AM 13 Good Valencia and Columbus Square 02/16/2025 8 AM 11 Good Valencia and Legacy 02/16/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 02/16/2025 8 AM ** ** Warner Avenue 02/16/2025 8 AM 7 Good Warner and Armstrong 02/16/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 17, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/17/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/17/2025 8 AM 20 Good Hangar Fenceline - N Center 02/17/2025 8 AM ** ** Hangar Fenceline - N Corner 02/17/2025 8 AM 14 Good Hangar Fenceline - NE Corner 02/17/2025 8 AM 18 Good Hangar Fenceline - NE Side 02/17/2025 8 AM 16 Good Hangar Fenceline - S Corner 02/17/2025 8 AM 14 Good Hangar Fenceline - S Side 02/17/2025 8 AM 15 Good Hangar Fenceline - SW Corner 02/17/2025 8 AM 21 Good Hangar Fenceline - SW Side 02/17/2025 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/17/2025 8 AM Particulate Matter 14 Level of Concern Good Legacy Road 02/17/2025 8 AM ** ** Moffett and Tustin Ranch 02/17/2025 8 AM 22 Good Valencia and Armstrong 02/17/2025 8 AM ** ** Valencia and Columbus Square 02/17/2025 8 AM 15 Good Valencia and Legacy 02/17/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 02/17/2025 8 AM 14 Good Warner Avenue 02/17/2025 8 AM 9 Good Warner and Armstrong 02/17/2025 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 18, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/18/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/18/2025 8 AM 16 Good Hangar Fenceline - N Center 02/18/2025 8 AM 11 Good Hangar Fenceline - N Corner 02/18/2025 8 AM 11 Good Hangar Fenceline - NE Corner 02/18/2025 8 AM 16 Good Hangar Fenceline - NE Side 02/18/2025 8 AM 13 Good Hangar Fenceline - S Corner 02/18/2025 8 AM 11 Good Hangar Fenceline - S Side 02/18/2025 8 AM 11 Good Hangar Fenceline - SW Corner 02/18/2025 8 AM 17 Good Hangar Fenceline - SW Side 02/18/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/18/2025 8 AM Particulate Matter 15 Level of Concern Good Legacy Road 02/18/2025 8 AM ** ** Moffett and Tustin Ranch 02/18/2025 8 AM 20 Good Valencia and Armstrong 02/18/2025 8 AM ** ** Valencia and Columbus Square 02/18/2025 8 AM ** ** Valencia and Legacy 02/18/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 02/18/2025 8 AM 10 Good Warner Avenue 02/18/2025 8 AM 9 Good Warner and Armstrong 02/18/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 19, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 02/19/2025 8 AM Particulate Matter 27 Level of Concern Good Hangar Fenceline - E Side 02/19/2025 8 AM 27 Good Hangar Fenceline - N Center 02/19/2025 8 AM 22 Good Hangar Fenceline - N Corner 02/19/2025 8 AM 17 Good Hangar Fenceline - NE Corner 02/19/2025 8 AM 25 Good Hangar Fenceline - NE Side 02/19/2025 8 AM 22 Good Hangar Fenceline - S Corner 02/19/2025 8 AM 19 Good Hangar Fenceline - S Side 02/19/2025 8 AM 19 Good Hangar Fenceline - SW Corner 02/19/2025 8 AM 28 Good Hangar Fenceline - SW Side 02/19/2025 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/19/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 02/19/2025 8 AM 27 Good Moffett and Tustin Ranch 02/19/2025 8 AM 29 Good Valencia and Armstrong 02/19/2025 8 AM 10 Good Valencia and Columbus Square 02/19/2025 8 AM 21 Good Valencia and Legacy 02/19/2025 8 AM 16 Good Victory and Tustin Ranch Rd. 02/19/2025 8 AM 18 Good Warner Avenue 02/19/2025 8 AM 16 Good Warner and Armstrong 02/19/2025 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 20, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/20/2025 8 AM Matter 38 Level of Concern Good Hangar Fenceline - E Side 02/20/2025 8 AM 39 Good Hangar Fenceline - N Center 02/20/2025 8 AM 31 Good Hangar Fenceline - N Corner 02/20/2025 8 AM 26 Good Hangar Fenceline - NE Corner 02/20/2025 8 AM ** ** Hangar Fenceline - NE Side 02/20/2025 8 AM 31 Good Hangar Fenceline - S Corner 02/20/2025 8 AM ** ** Hangar Fenceline - S Side 02/20/2025 8 AM 29 Good Hangar Fenceline - SW Corner 02/20/2025 8 AM ** ** Hangar Fenceline - SW Side 02/20/2025 8 AM 32 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/20/2025 8 AM Particulate Matter 31 Level of Concern Good Legacy Road 02/20/2025 8 AM 33 Good Moffett and Tustin Ranch 02/20/2025 8 AM 40 Good Valencia and Armstrong 02/20/2025 8 AM 14 Good Valencia and Columbus Square 02/20/2025 8 AM 31 Good Valencia and Legacy 02/20/2025 8 AM 23 Good Victory and Tustin Ranch Rd. 02/20/2025 8 AM 28 Good Warner Avenue 02/20/2025 8 AM ** ** Warner and Armstrong 02/20/2025 8 AM 26 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 21, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/21/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/21/2025 8 AM 47 Good Hangar Fenceline - N Center 02/21/2025 8 AM 41 Good Hangar Fenceline - N Corner 02/21/2025 8 AM 32 Good Hangar Fenceline - NE Corner 02/21/2025 8 AM 45 Good Hangar Fenceline - NE Side 02/21/2025 8 AM 40 Good Hangar Fenceline - S Corner 02/21/2025 8 AM ** ** Hangar Fenceline - S Side 02/21/2025 8 AM 36 Good Hangar Fenceline - SW Corner 02/21/2025 8 AM 55 Moderate Hangar Fenceline - SW Side 02/21/2025 8 AM 41 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/21/2025 8 AM Particulate Matter 36 Level of Concern Good Legacy Road 02/21/2025 8 AM ** ** Moffett and Tustin Ranch 02/21/2025 8 AM 46 Good Valencia and Armstrong 02/21/2025 8 AM ** ** Valencia and Columbus Square 02/21/2025 8 AM 40 Good Valencia and Legacy 02/21/2025 8 AM 30 Good Victory and Tustin Ranch Rd. 02/21/2025 8 AM 34 Good Warner Avenue 02/21/2025 8 AM ** ** Warner and Armstrong 02/21/2025 8 AM 32 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 22, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/22/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/22/2025 8 AM 46 Good Hangar Fenceline - N Center 02/22/2025 8 AM 37 Good Hangar Fenceline - N Corner 02/22/2025 8 AM 30 Good Hangar Fenceline - NE Corner 02/22/2025 8 AM 44 Good Hangar Fenceline - NE Side 02/22/2025 8 AM 39 Good Hangar Fenceline - S Corner 02/22/2025 8 AM ** ** Hangar Fenceline - S Side 02/22/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/22/2025 8 AM 53 Good Hangar Fenceline - SW Side 02/22/2025 8 AM 40 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/22/2025 8 AM Particulate Matter 36 Level of Concern Good Legacy Road 02/22/2025 8 AM ** ** Moffett and Tustin Ranch 02/22/2025 8 AM 45 Good Valencia and Armstrong 02/22/2025 8 AM 17 Good Valencia and Columbus Square 02/22/2025 8 AM 38 Good Valencia and Legacy 02/22/2025 8 AM 27 Good Victory and Tustin Ranch Rd. 02/22/2025 8 AM 32 Good Warner Avenue 02/22/2025 8 AM ** ** Warner and Armstrong 02/22/2025 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 23, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 02/23/2025 8 AM ** ** Hangar Fenceline - E Side 02/23/2025 8 AM 33 Good Hangar Fenceline - N Center 02/23/2025 8 AM 27 Good Hangar Fenceline - N Corner 02/23/2025 8 AM 22 Good Hangar Fenceline - NE Corner 02/23/2025 8 AM 30 Good Hangar Fenceline - NE Side 02/23/2025 8 AM 26 Good Hangar Fenceline - S Corner 02/23/2025 8 AM ** ** Hangar Fenceline - S Side 02/23/2025 8 AM 29 Good Hangar Fenceline - SW Corner 02/23/2025 8 AM 43 Good Hangar Fenceline - SW Side 02/23/2025 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/23/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/23/2025 8 AM 35 Good Moffett and Tustin Ranch 02/23/2025 8 AM 34 Good Valencia and Armstrong 02/23/2025 8 AM 12 Good Valencia and Columbus Square 02/23/2025 8 AM 26 Good Valencia and Legacy 02/23/2025 8 AM 20 Good Victory and Tustin Ranch Rd. 02/23/2025 8 AM ** ** Warner Avenue 02/23/2025 8 AM ** ** Warner and Armstrong 02/23/2025 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 24, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/24/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/24/2025 8 AM ** ** Hangar Fenceline - N Center 02/24/2025 8 AM 17 Good Hangar Fenceline - N Corner 02/24/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/24/2025 8 AM ** ** Hangar Fenceline - NE Side 02/24/2025 8 AM 18 Good Hangar Fenceline - S Corner 02/24/2025 8 AM ** ** Hangar Fenceline - S Side 02/24/2025 8 AM 20 Good Hangar Fenceline - SW Corner 02/24/2025 8 AM 29 Good Hangar Fenceline - SW Side 02/24/2025 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/24/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/24/2025 8 AM 25 Good Moffett and Tustin Ranch 02/24/2025 8 AM 26 Good Valencia and Armstrong 02/24/2025 8 AM 10 Good Valencia and Columbus Square 02/24/2025 8 AM 17 Good Valencia and Legacy 02/24/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/24/2025 8 AM 15 Good Warner Avenue 02/24/2025 8 AM ** ** Warner and Armstrong 02/24/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 25, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/25/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/25/2025 8 AM ** ** Hangar Fenceline - N Center 02/25/2025 8 AM 26 Good Hangar Fenceline - N Corner 02/25/2025 8 AM 24 Good Hangar Fenceline - NE Corner 02/25/2025 8 AM 29 Good Hangar Fenceline - NE Side 02/25/2025 8 AM 28 Good Hangar Fenceline - S Corner 02/25/2025 8 AM ** ** Hangar Fenceline - S Side 02/25/2025 8 AM 26 Good Hangar Fenceline - SW Corner 02/25/2025 8 AM 40 Good Hangar Fenceline - SW Side 02/25/2025 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/25/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/25/2025 8 AM 36 Good Moffett and Tustin Ranch 02/25/2025 8 AM 34 Good Valencia and Armstrong 02/25/2025 8 AM ** ** Valencia and Columbus Square 02/25/2025 8 AM 26 Good Valencia and Legacy 02/25/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/25/2025 8 AM 22 Good Warner Avenue 02/25/2025 8 AM ** ** Warner and Armstrong 02/25/2025 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 26, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/26/2025 8 AM Matter 41 Level of Concern Good Hangar Fenceline - E Side 02/26/2025 8 AM 46 Good Hangar Fenceline - N Center 02/26/2025 8 AM 37 Good Hangar Fenceline - N Corner 02/26/2025 8 AM 31 Good Hangar Fenceline - NE Corner 02/26/2025 8 AM 41 Good Hangar Fenceline - NE Side 02/26/2025 8 AM 42 Good Hangar Fenceline - S Corner 02/26/2025 8 AM 47 Good Hangar Fenceline - S Side 02/26/2025 8 AM 32 Good Hangar Fenceline - SW Corner 02/26/2025 8 AM 50 Good Hangar Fenceline - SW Side 02/26/2025 8 AM 38 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/26/2025 8 AM Particulate Matter 28 Level of Concern Good Legacy Road 02/26/2025 8 AM 50 Good Moffett and Tustin Ranch 02/26/2025 8 AM ** ** Valencia and Armstrong 02/26/2025 8 AM 13 Good Valencia and Columbus Square 02/26/2025 8 AM 39 Good Valencia and Legacy 02/26/2025 8 AM 24 Good Victory and Tustin Ranch Rd. 02/26/2025 8 AM 29 Good Warner Avenue 02/26/2025 8 AM ** ** Warner and Armstrong 02/26/2025 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 27, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/27/2025 8 AM Matter 46 Level of Concern Good Hangar Fenceline - E Side 02/27/2025 8 AM 52 Good Hangar Fenceline - N Center 02/27/2025 8 AM 4S Good Hangar Fenceline - N Corner 02/27/202S 8 AM 35 Good Hangar Fenceline - NE Corner 02/27/202S 8 AM 45 Good Hangar Fenceline - NE Side 02/27/2025 8 AM 46 Good Hangar Fenceline - S Corner 02/27/2025 8 AM 51 Good Hangar Fenceline - S Side 02/27/2025 8 AM 38 Good Hangar Fenceline - SW Corner 02/27/2025 8 AM 58 Moderate Hangar Fenceline - SW Side 02/27/2025 8 AM 41 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/27/2025 8 AM Particulate Matter 32 Level of Concern Good Legacy Road 02/27/2025 8 AM 51 Good Moffett and Tustin Ranch 02/27/2025 8 AM 46 Good Valencia and Armstrong 02/27/2025 8 AM 16 Good Valencia and Columbus Square 02/27/2025 8 AM 45 Good Valencia and Legacy 02/27/2025 8 AM 30 Good Victory and Tustin Ranch Rd. 02/27/2025 8 AM 33 Good Warner Avenue 02/27/2025 8 AM ** ** Warner and Armstrong 02/27/2025 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 28, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/28/2025 8 AM Matter 20 Level of Concern Good Hangar Fenceline - E Side 02/28/2025 8 AM 21 Good Hangar Fenceline - N Center 02/28/2025 8 AM ** ** Hangar Fenceline - N Corner 02/28/2025 8 AM 16 Good Hangar Fenceline - NE Corner 02/28/2025 8 AM 20 Good Hangar Fenceline - NE Side 02/28/2025 8 AM 17 Good Hangar Fenceline - S Corner 02/28/2025 8 AM 23 Good Hangar Fenceline - S Side 02/28/2025 8 AM 21 Good Hangar Fenceline - SW Corner 02/28/2025 8 AM 25 Good Hangar Fenceline - SW Side 02/28/2025 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/28/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/28/2025 8 AM 25 Good Moffett and Tustin Ranch 02/28/2025 8 AM 27 Good Valencia and Armstrong 02/28/2025 8 AM 8 Good Valencia and Columbus Square 02/28/2025 8 AM 16 Good Valencia and Legacy 02/28/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 02/28/2025 8 AM 17 Good Warner Avenue 02/28/2025 8 AM 11 Good Warner and Armstrong 02/28/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, March 1, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/01/2025 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 03/01/2025 8 AM 14 Good Hangar Fenceline - N Center 03/01/2025 8 AM 10 Good Hangar Fenceline - N Corner 03/01/2025 8 AM 9 Good Hangar Fenceline - NE Corner 03/01/2025 8 AM 13 Good Hangar Fenceline - NE Side 03/01/2025 8 AM 10 Good Hangar Fenceline - S Corner 03/01/2025 8 AM 16 Good Hangar Fenceline - S Side 03/01/2025 8 AM 13 Good Hangar Fenceline - SW Corner 03/01/2025 8 AM 12 Good Hangar Fenceline - SW Side 03/01/2025 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/01/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/01/2025 8 AM 23 Good Moffett and Tustin Ranch 03/01/2025 8 AM 20 Good Valencia and Armstrong 03/01/2025 8 AM ** ** Valencia and Columbus Square 03/01/2025 8 AM 9 Good Valencia and Legacy 03/01/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 03/01/2025 8 AM 6 Good Warner Avenue 03/01/2025 8 AM 8 Good Warner and Armstrong 03/01/2025 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, March 2, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/02/2025 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 03/02/2025 8 AM 16 Good Hangar Fenceline - N Center 03/02/2025 8 AM 11 Good Hangar Fenceline - N Corner 03/02/2025 8 AM 10 Good Hangar Fenceline - NE Corner 03/02/2025 8 AM 14 Good Hangar Fenceline - NE Side 03/02/2025 8 AM 12 Good Hangar Fenceline - S Corner 03/02/2025 8 AM 14 Good Hangar Fenceline - S Side 03/02/2025 8 AM 14 Good Hangar Fenceline - SW Corner 03/02/2025 8 AM 14 Good Hangar Fenceline - SW Side 03/02/2025 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/02/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/02/2025 8 AM 12 Good Moffett and Tustin Ranch 03/02/2025 8 AM 22 Good Valencia and Armstrong 03/02/2025 8 AM 3 Good Valencia and Columbus Square 03/02/2025 8 AM 11 Good Valencia and Legacy 03/02/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 03/02/2025 8 AM 7 Good Warner Avenue 03/02/2025 8 AM ** ** Warner and Armstrong 03/02/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, March 3, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/03/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 03/03/2025 8 AM 16 Good Hangar Fenceline - N Center 03/03/2025 8 AM ** ** Hangar Fenceline - N Corner 03/03/2025 8 AM 9 Good Hangar Fenceline - NE Corner 03/03/2025 8 AM ** ** Hangar Fenceline - NE Side 03/03/2025 8 AM 10 Good Hangar Fenceline - S Corner 03/03/2025 8 AM ** ** Hangar Fenceline - S Side 03/03/2025 8 AM 13 Good Hangar Fenceline - SW Corner 03/03/2025 8 AM 11 Good Hangar Fenceline - SW Side 03/03/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/03/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/03/2025 8 AM 15 Good Moffett and Tustin Ranch 03/03/2025 8 AM 22 Good Valencia and Armstrong 03/03/2025 8 AM ** ** Valencia and Columbus Square 03/03/2025 8 AM 9 Good Valencia and Legacy 03/03/2025 8 AM 6 Good Victory and Tustin Ranch Rd. 03/03/2025 8 AM 7 Good Warner Avenue 03/03/2025 8 AM 6 Good Warner and Armstrong 03/03/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, March 4, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/04/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/04/2025 8 AM 13 Good Hangar Fenceline - N Center 03/04/2025 8 AM 10 Good Hangar Fenceline - N Corner 03/04/2025 8 AM 8 Good Hangar Fenceline - NE Corner 03/04/2025 8 AM 11 Good Hangar Fenceline - NE Side 03/04/2025 8 AM 9 Good Hangar Fenceline - S Corner 03/04/2025 8 AM 14 Good Hangar Fenceline - S Side 03/04/2025 8 AM 13 Good Hangar Fenceline - SW Corner 03/04/2025 8 AM 11 Good Hangar Fenceline - SW Side 03/04/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/04/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/04/2025 8 AM 15 Good Moffett and Tustin Ranch 03/04/2025 8 AM 21 Good Valencia and Armstrong 03/04/2025 8 AM ** ** Valencia and Columbus Square 03/04/2025 8 AM 9 Good Valencia and Legacy 03/04/2025 8 AM 6 Good Victory and Tustin Ranch Rd. 03/04/2025 8 AM 5 Good Warner Avenue 03/04/2025 8 AM 6 Good Warner and Armstrong 03/04/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, March 5, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 03/05/2025 8 AM 16 Good Hangar Fenceline - E Side 03/05/2025 8 AM ** ** Hangar Fenceline - N Center 03/05/2025 8 AM 15 Good Hangar Fenceline - N Corner 03/05/2025 8 AM 13 Good Hangar Fenceline - NE Corner 03/05/2025 8 AM 16 Good Hangar Fenceline - NE Side 03/05/2025 8 AM 15 Good Hangar Fenceline - S Corner 03/05/2025 8 AM 19 Good Hangar Fenceline - S Side 03/05/2025 8 AM 16 Good Hangar Fenceline - SW Corner 03/05/2025 8 AM 18 Good Hangar Fenceline - SW Side 03/05/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/05/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/05/2025 8 AM 23 Good Moffett and Tustin Ranch 03/05/2025 8 AM 26 Good Valencia and Armstrong 03/05/2025 8 AM ** ** Valencia and Columbus Square 03/05/2025 8 AM 14 Good Valencia and Legacy 03/05/2025 8 AM 10 Good Victory and Tustin Ranch Rd. 03/05/2025 8 AM 10 Good Warner Avenue 03/05/2025 8 AM 11 Good Warner and Armstrong 03/05/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, March 6, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/06/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 03/06/2025 8 AM 13 Good Hangar Fenceline - N Center 03/06/2025 8 AM 11 Good Hangar Fenceline - N Corner 03/06/2025 8 AM 9 Good Hangar Fenceline - NE Corner 03/06/2025 8 AM 11 Good Hangar Fenceline - NE Side 03/06/2025 8 AM 10 Good Hangar Fenceline - S Corner 03/06/2025 8 AM 12 Good Hangar Fenceline - S Side 03/06/2025 8 AM 13 Good Hangar Fenceline - SW Corner 03/06/2025 8 AM 11 Good Hangar Fenceline - SW Side 03/06/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/06/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/06/2025 8 AM ** ** Moffett and Tustin Ranch 03/06/2025 8 AM 22 Good Valencia and Armstrong 03/06/2025 8 AM ** ** Valencia and Columbus Square 03/06/2025 8 AM ** ** Valencia and Legacy 03/06/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 03/06/2025 8 AM ** ** Warner Avenue 03/06/2025 8 AM 8 Good Warner and Armstrong 03/06/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, March 7, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 03/07/2025 8 AM 17 Good Hangar Fenceline - E Side 03/07/2025 8 AM ** ** Hangar Fenceline - N Center 03/07/2025 8 AM 19 Good Hangar Fenceline - N Corner 03/07/2025 8 AM 12 Good Hangar Fenceline - NE Corner 03/07/2025 8 AM 15 Good Hangar Fenceline - NE Side 03/07/2025 8 AM 16 Good Hangar Fenceline - S Corner 03/07/2025 8 AM ** ** Hangar Fenceline - S Side 03/07/2025 8 AM 18 Good Hangar Fenceline - SW Corner 03/07/2025 8 AM 20 Good Hangar Fenceline - SW Side 03/07/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 03/07/2025 8 AM Particulate Matter 25 Level of Concern Good Legacy Road 03/07/2025 8 AM ** ** Moffett and Tustin Ranch 03/07/2025 8 AM 26 Good Valencia and Armstrong 03/07/2025 8 AM ** ** Valencia and Columbus Square 03/07/2025 8 AM 16 Good Valencia and Legacy 03/07/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 03/07/2025 8 AM 10 Good Warner Avenue 03/07/2025 8 AM 12 Good Warner and Armstrong 03/07/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, March 8, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/08/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 03/08/2025 8 AM 12 Good Hangar Fenceline - N Center 03/08/2025 8 AM 8 Good Hangar Fenceline - N Corner 03/08/2025 8 AM 6 Good Hangar Fenceline - NE Corner 03/08/2025 8 AM 9 Good Hangar Fenceline - NE Side 03/08/2025 8 AM 7 Good Hangar Fenceline - S Corner 03/08/2025 8 AM 10 Good Hangar Fenceline - S Side 03/08/2025 8 AM 12 Good Hangar Fenceline - SW Corner 03/08/2025 8 AM 10 Good Hangar Fenceline - SW Side 03/08/2025 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/08/2025 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 03/08/2025 8 AM 17 Good Moffett and Tustin Ranch 03/08/2025 8 AM 20 Good Valencia and Armstrong 03/08/2025 8 AM ** ** Valencia and Columbus Square 03/08/2025 8 AM 7 Good Valencia and Legacy 03/08/2025 8 AM 5 Good Victory and Tustin Ranch Rd. 03/08/2025 8 AM 6 Good Warner Avenue 03/08/2025 8 AM 6 Good Warner and Armstrong 03/08/2025 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, March 9, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction tDaylight savings time was recognized during this time Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Endingt 03/09/2025 8 AM 15 Good Hangar Fenceline - E Side 03/09/2025 8 AM 19 Good Hangar Fenceline - N Center 03/09/2025 8 AM 15 Good Hangar Fenceline - N Corner 03/09/2025 8 AM 11 Good Hangar Fenceline - NE Corner 03/09/2025 8 AM 15 Good Hangar Fenceline - NE Side 03/09/2025 8 AM 14 Good Hangar Fenceline - S Corner 03/09/2025 8 AM 15 Good Hangar Fenceline - S Side 03/09/2025 8 AM 15 Good Hangar Fenceline - SW Corner 03/09/2025 8 AM 17 Good • •24-Hour Hangar Fenceline - SW Side Period • • t 03/09/2025 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - W Side 03/09/2025 8 AM ** ** Legacy Road 03/09/2025 8 AM 23 Good Moffett and Tustin Ranch 03/09/2025 8 AM 26 Good Valencia and Armstrong 03/09/2025 8 AM 3 Good Valencia and Columbus Square 03/09/2025 8 AM 13 Good Valencia and Legacy 03/09/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 03/09/2025 8 AM 11 Good Warner Avenue 03/09/2025 8 AM 12 Good Warner and Armstrong 03/09/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 5 07to Health warning of emergency conditions: ever•ne is more likely be affected. Monday, March 10, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/10/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/10/2025 8 AM 25 Good Hangar Fenceline - N Center 03/10/2025 8 AM 18 Good Hangar Fenceline - N Corner 03/10/2025 8 AM 15 Good Hangar Fenceline - NE Corner 03/10/2025 8 AM ** ** Hangar Fenceline - NE Side 03/10/2025 8 AM 18 Good Hangar Fenceline - S Corner 03/10/2025 8 AM 20 Good Hangar Fenceline - S Side 03/10/2025 8 AM 20 Good Hangar Fenceline - SW Corner 03/10/2025 8 AM 24 Good Hangar Fenceline - SW Side 03/10/2025 8 AM 17 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/10/2025 8 AM Particulate Matter 24 Level of Concern Good Legacy Road 03/10/2025 8 AM ** ** Moffett and Tustin Ranch 03/10/2025 8 AM 30 Good Valencia and Armstrong 03/10/2025 8 AM 6 Good Valencia and Columbus Square 03/10/2025 8 AM 18 Good Valencia and Legacy 03/10/2025 8 AM ** ** Victory and Tustin Ranch Rd. 03/10/2025 8 AM 15 Good Warner Avenue 03/10/2025 8 AM 17 Good Warner and Armstrong 03/10/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, March 11, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/11/2025 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 03/11/2025 8 AM 18 Good Hangar Fenceline - N Center 03/11/2025 8 AM 14 Good Hangar Fenceline - N Corner 03/11/2025 8 AM 12 Good Hangar Fenceline - NE Corner 03/11/2025 8 AM 16 Good Hangar Fenceline - NE Side 03/11/2025 8 AM 14 Good Hangar Fenceline - S Corner 03/11/2025 8 AM ** ** Hangar Fenceline - S Side 03/11/2025 8 AM 17 Good Hangar Fenceline - SW Corner 03/11/2025 8 AM 21 Good Hangar Fenceline - SW Side 03/11/2025 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/11/2025 8 AM Particulate Matter 21 Level of Concern Good Legacy Road 03/11/2025 8 AM ** ** Moffett and Tustin Ranch 03/11/2025 8 AM 27 Good Valencia and Armstrong 03/11/2025 8 AM ** ** Valencia and Columbus Square 03/11/2025 8 AM 14 Good Valencia and Legacy 03/11/2025 8 AM 11 Good Victory and Tustin Ranch Rd. 03/11/2025 8 AM 12 Good Warner Avenue 03/11/2025 8 AM 12 Good Warner and Armstrong 03/11/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, March 12, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/12/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/12/2025 8 AM 7 Good Hangar Fenceline - N Center 03/12/2025 8 AM 4 Good Hangar Fenceline - N Corner 03/12/2025 8 AM 3 Good Hangar Fenceline - NE Corner 03/12/2025 8 AM ** ** Hangar Fenceline - NE Side 03/12/2025 8 AM 4 Good Hangar Fenceline - S Corner 03/12/2025 8 AM 9 Good Hangar Fenceline - S Side 03/12/2025 8 AM 8 Good Hangar Fenceline - SW Corner 03/12/2025 8 AM 5 Good Hangar Fenceline - SW Side 03/12/2025 8 AM 3 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/12/2025 8 AM Particulate Matter 16 Level of Concern Good Legacy Road 03/12/2025 8 AM ** ** Moffett and Tustin Ranch 03/12/2025 8 AM 18 Good Valencia and Armstrong 03/12/2025 8 AM ** ** Valencia and Columbus Square 03/12/2025 8 AM 4 Good Valencia and Legacy 03/12/2025 8 AM 3 Good Victory and Tustin Ranch Rd. 03/12/2025 8 AM 2 Good Warner Avenue 03/12/2025 8 AM 3 Good Warner and Armstrong 03/12/2025 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, March 13, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/13/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/13/2025 8 AM 7 Good Hangar Fenceline - N Center 03/13/2025 8 AM 3 Good Hangar Fenceline - N Corner 03/13/2025 8 AM 3 Good Hangar Fenceline - NE Corner 03/13/2025 8 AM ** ** Hangar Fenceline - NE Side 03/13/2025 8 AM 3 Good Hangar Fenceline - S Corner 03/13/2025 8 AM 7 Good Hangar Fenceline - S Side 03/13/2025 8 AM ** ** Hangar Fenceline - SW Corner 03/13/2025 8 AM 4 Good Hangar Fenceline - SW Side 03/13/2025 8 AM 2 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/13/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/13/2025 8 AM 8 Good Moffett and Tustin Ranch 03/13/2025 8 AM 18 Good Valencia and Armstrong 03/13/2025 8 AM ** ** Valencia and Columbus Square 03/13/2025 8 AM ** ** Valencia and Legacy 03/13/2025 8 AM 2 Good Victory and Tustin Ranch Rd. 03/13/2025 8 AM 1 Good Warner Avenue 03/13/2025 8 AM ** ** Warner and Armstrong 03/13/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, March 14, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/14/2025 8 AM Matter 6 Level of Concern Good Hangar Fenceline - E Side 03/14/2025 8 AM 10 Good Hangar Fenceline - N Center 03/14/2025 8 AM 5 Good Hangar Fenceline - N Corner 03/14/2025 8 AM 5 Good Hangar Fenceline - NE Corner 03/14/2025 8 AM 6 Good Hangar Fenceline - NE Side 03/14/2025 8 AM 5 Good Hangar Fenceline - S Corner 03/14/2025 8 AM 9 Good Hangar Fenceline - S Side 03/14/2025 8 AM ** ** Hangar Fenceline - SW Corner 03/14/2025 8 AM 6 Good Hangar Fenceline - SW Side 03/14/2025 8 AM 2 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/14/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 03/14/2025 8 AM 17 Good Moffett and Tustin Ranch 03/14/2025 8 AM 20 Good Valencia and Armstrong 03/14/2025 8 AM ** ** Valencia and Columbus Square 03/14/2025 8 AM ** ** Valencia and Legacy 03/14/2025 8 AM 3 Good Victory and Tustin Ranch Rd. 03/14/2025 8 AM 2 Good Warner Avenue 03/14/2025 8 AM 4 Good Warner and Armstrong 03/14/2025 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, March 15, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 03/15/2025 8 AM ** ** Hangar Fenceline - E Side 03/15/2025 8 AM 22 Good Hangar Fenceline - N Center 03/15/2025 8 AM 16 Good Hangar Fenceline - N Corner 03/15/2025 8 AM 11 Good Hangar Fenceline - NE Corner 03/15/2025 8 AM 14 Good Hangar Fenceline - NE Side 03/15/2025 8 AM 15 Good Hangar Fenceline - S Corner 03/15/2025 8 AM 14 Good Hangar Fenceline - S Side 03/15/2025 8 AM 17 Good Hangar Fenceline - SW Corner 03/15/2025 8 AM 19 Good Hangar Fenceline - SW Side 03/15/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/15/2025 8 AM Particulate Matter 27 Level of Concern Good Legacy Road 03/15/2025 8 AM 36 Good Moffett and Tustin Ranch 03/15/2025 8 AM 27 Good Valencia and Armstrong 03/15/2025 8 AM ** ** Valencia and Columbus Square 03/15/2025 8 AM 16 Good Valencia and Legacy 03/15/2025 8 AM 10 Good Victory and Tustin Ranch Rd. 03/15/2025 8 AM 8 Good Warner Avenue 03/15/2025 8 AM 13 Good Warner and Armstrong 03/15/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, March 16, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/16/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/16/2025 8 AM 18 Good Hangar Fenceline - N Center 03/16/2025 8 AM 13 Good Hangar Fenceline - N Corner 03/16/2025 8 AM ** ** Hangar Fenceline - NE Corner 03/16/2025 8 AM 14 Good Hangar Fenceline - NE Side 03/16/2025 8 AM ** ** Hangar Fenceline - S Corner 03/16/2025 8 AM 14 Good Hangar Fenceline - S Side 03/16/2025 8 AM 15 Good Hangar Fenceline - SW Corner 03/16/2025 8 AM 17 Good Hangar Fenceline - SW Side 03/16/2025 8 AM 10 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/16/2025 8 AM Particulate Matter 25 Level of Concern Good Legacy Road 03/16/2025 8 AM 32 Good Moffett and Tustin Ranch 03/16/2025 8 AM 27 Good Valencia and Armstrong 03/16/2025 8 AM ** ** Valencia and Columbus Square 03/16/2025 8 AM 13 Good Valencia and Legacy 03/16/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 03/16/2025 8 AM 7 Good Warner Avenue 03/16/2025 8 AM 12 Good Warner and Armstrong 03/16/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, March 17, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/17/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/17/2025 8 AM 23 Good Hangar Fenceline - N Center 03/17/2025 8 AM 18 Good Hangar Fenceline - N Corner 03/17/2025 8 AM ** ** Hangar Fenceline - NE Corner 03/17/2025 8 AM 20 Good Hangar Fenceline - NE Side 03/17/2025 8 AM 15 Good Hangar Fenceline - S Corner 03/17/2025 8 AM 19 Good Hangar Fenceline - S Side 03/17/2025 8 AM 18 Good Hangar Fenceline - SW Corner 03/17/2025 8 AM 23 Good Hangar Fenceline - SW Side 03/17/2025 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/17/2025 8 AM Particulate Matter 25 Level of Concern Good Legacy Road 03/17/2025 8 AM 37 Good Moffett and Tustin Ranch 03/17/2025 8 AM 31 Good Valencia and Armstrong 03/17/2025 8 AM ** ** Valencia and Columbus Square 03/17/2025 8 AM 18 Good Valencia and Legacy 03/17/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 03/17/2025 8 AM 10 Good Warner Avenue 03/17/2025 8 AM 16 Good Warner and Armstrong 03/17/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, March 18, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/18/2025 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 03/18/2025 8 AM 19 Good Hangar Fenceline - N Center 03/18/2025 8 AM 14 Good Hangar Fenceline - N Corner 03/18/2025 8 AM 13 Good Hangar Fenceline - NE Corner 03/18/2025 8 AM ** ** Hangar Fenceline - NE Side 03/18/2025 8 AM 12 Good Hangar Fenceline - S Corner 03/18/2025 8 AM 16 Good Hangar Fenceline - S Side 03/18/2025 8 AM 16 Good Hangar Fenceline - SW Corner 03/18/2025 8 AM ** ** Hangar Fenceline - SW Side 03/18/2025 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/18/2025 8 AM Particulate Matter 26 Level of Concern Good Legacy Road 03/18/2025 8 AM 40 Good Moffett and Tustin Ranch 03/18/2025 8 AM 28 Good Valencia and Armstrong 03/18/2025 8 AM ** ** Valencia and Columbus Square 03/18/2025 8 AM 14 Good Valencia and Legacy 03/18/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 03/18/2025 8 AM 7 Good Warner Avenue 03/18/2025 8 AM 12 Good Warner and Armstrong 03/18/2025 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, March 19, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/19/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 03/19/2025 8 AM 12 Good Hangar Fenceline - N Center 03/19/2025 8 AM 8 Good Hangar Fenceline - N Corner 03/19/2025 8 AM 7 Good Hangar Fenceline - NE Corner 03/19/2025 8 AM 8 Good Hangar Fenceline - NE Side 03/19/2025 8 AM ** ** Hangar Fenceline - S Corner 03/19/2025 8 AM 12 Good Hangar Fenceline - S Side 03/19/2025 8 AM 13 Good Hangar Fenceline - SW Corner 03/19/2025 8 AM 13 Good Hangar Fenceline - SW Side 03/19/2025 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/19/2025 8 AM Particulate Matter 22 Level of Concern Good Legacy Road 03/19/2025 8 AM 36 Good Moffett and Tustin Ranch 03/19/2025 8 AM 23 Good Valencia and Armstrong 03/19/2025 8 AM ** ** Valencia and Columbus Square 03/19/2025 8 AM 7 Good Valencia and Legacy 03/19/2025 8 AM 5 Good Victory and Tustin Ranch Rd. 03/19/2025 8 AM 4 Good Warner Avenue 03/19/2025 8 AM 7 Good Warner and Armstrong 03/19/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, March 20, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/20/2025 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 03/20/2025 8 AM 12 Good Hangar Fenceline - N Center 03/20/2025 8 AM 7 Good Hangar Fenceline - N Corner 03/20/2025 8 AM 7 Good Hangar Fenceline - NE Corner 03/20/2025 8 AM 9 Good Hangar Fenceline - NE Side 03/20/2025 8 AM 7 Good Hangar Fenceline - S Corner 03/20/2025 8 AM 13 Good Hangar Fenceline - S Side 03/20/2025 8 AM 12 Good Hangar Fenceline - SW Corner 03/20/2025 8 AM 12 Good Hangar Fenceline - SW Side 03/20/2025 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/20/2025 8 AM Particulate Matter 20 Level of Concern Good Legacy Road 03/20/2025 8 AM 29 Good Moffett and Tustin Ranch 03/20/2025 8 AM 24 Good Valencia and Armstrong 03/20/2025 8 AM ** ** Valencia and Columbus Square 03/20/2025 8 AM ** ** Valencia and Legacy 03/20/2025 8 AM 5 Good Victory and Tustin Ranch Rd. 03/20/2025 8 AM 5 Good Warner Avenue 03/20/2025 8 AM 9 Good Warner and Armstrong 03/20/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, March 21, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 03/21/2025 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - E Side 03/21/2025 8 AM 15 Good Hangar Fenceline - N Center 03/21/2025 8 AM 11 Good Hangar Fenceline - N Corner 03/21/2025 8 AM 10 Good Hangar Fenceline - NE Corner 03/21/2025 8 AM 12 Good Hangar Fenceline - NE Side 03/21/2025 8 AM 10 Good Hangar Fenceline - S Corner 03/21/2025 8 AM 15 Good Hangar Fenceline - S Side 03/21/2025 8 AM 14 Good Hangar Fenceline - SW Corner 03/21/2025 8 AM 14 Good Hangar Fenceline - SW Side 03/21/2025 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 03/21/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 03/21/2025 8 AM 39 Good Moffett and Tustin Ranch 03/21/2025 8 AM 26 Good Valencia and Armstrong 03/21/2025 8 AM ** ** Valencia and Columbus Square 03/21/2025 8 AM 10 Good Valencia and Legacy 03/21/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 03/21/2025 8 AM 6 Good Warner Avenue 03/21/2025 8 AM 9 Good Warner and Armstrong 03/21/2025 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, March 22, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for (155 to 254) �nhealthy Very Unhealthy ... (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) 'On March 21, 2025, the U.S. Navy decreased the number of air monitoring stations at the hangar site based on review of historical air monitoring data and an overall abatement of 50% of the Hangar 1 footprint. See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 03/22/2025 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 03/22/2025 8 AM 18 Good Hangar Fenceline - N Center 03/22/2025 8 AM 13 Good Hangar Fenceline - N Corner 03/22/2025 8 AM 12 Good Hangar Fenceline - NE Corner 03/22/2025 8 AM 15 Good Hangar Fenceline - S Side 03/22/2025 8 AM 16 Good Hangar Fenceline - SW Corner 03/22/2025 8 AM 18 Good Hangar Fenceline - SW Side 03/22/2025 8 AM 9 Good Hangar Fenceline - W Side 03/22/2025 8 AM 24 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. azardous 425 to 504 Health warning of emergency conditions: ever. . - likely ..- affected. Sunday, March 23, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/23/2025 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 03/23/2025 8 AM 23 Good Hangar Fenceline - N Center 03/23/2025 8 AM 18 Good Hangar Fenceline - N Corner 03/23/2025 8 AM 15 Good Hangar Fenceline - NE Corner 03/23/2025 8 AM 19 Good Hangar Fenceline - S Side 03/23/2025 8 AM 17 Good Hangar Fenceline - SW Corner 03/23/2025 8 AM 23 Good Hangar Fenceline - SW Side 03/23/2025 8 AM ** ** Hangar Fenceline - W Side 03/23/2025 8 AM 25 Good Legacy Road 03/23/2025 8 AM 47 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Monday, March 24, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/24/2025 8 AM Matter 26 Level of Concern Good Hangar Fenceline - E Side 03/24/2025 8 AM 31 Good Hangar Fenceline - N Center 03/24/2025 8 AM 25 Good Hangar Fenceline - N Corner 03/24/2025 8 AM 20 Good Hangar Fenceline - NE Corner 03/24/2025 8 AM 25 Good Hangar Fenceline - S Side 03/24/2025 8 AM 22 Good Hangar Fenceline - SW Corner 03/24/2025 8 AM 32 Good Hangar Fenceline - SW Side 03/24/2025 8 AM 14 Good Hangar Fenceline - W Side 03/24/2025 8 AM 29 Good Legacy Road 03/24/2025 8 AM 62 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Tuesday, March 25, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 03/25/2025 8 AM 41 Good Hangar Fenceline - E Side 03/25/2025 8 AM 48 Good Hangar Fenceline - N Center 03/25/2025 8 AM 39 Good Hangar Fenceline - N Corner 03/25/2025 8 AM 32 Good Hangar Fenceline - NE Corner 03/25/2025 8 AM ** ** Hangar Fenceline - S Side 03/25/2025 8 AM 32 Good Hangar Fenceline - SW Corner 03/25/2025 8 AM 55 Moderate Hangar Fenceline - SW Side 03/25/2025 8 AM 25 Good Hangar Fenceline - W Side 03/25/2025 8 AM 37 Good Legacy Road 03/25/2025 8 AM 83 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Wednesday, March 26, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/26/2025 8 AM Matter 40 Level of Concern Good Hangar Fenceline - E Side 03/26/2025 8 AM 47 Good Hangar Fenceline - N Center 03/26/2025 8 AM 39 Good Hangar Fenceline - N Corner 03/26/2025 8 AM 32 Good Hangar Fenceline - NE Corner 03/26/2025 8 AM 40 Good Hangar Fenceline - S Side 03/26/2025 8 AM 36 Good Hangar Fenceline - SW Corner 03/26/2025 8 AM 64 Moderate Hangar Fenceline - SW Side 03/26/2025 8 AM 28 Good Hangar Fenceline - W Side 03/26/2025 8 AM 38 Good Legacy Road 03/26/2025 8 AM 91 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Fri, March 27, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/27/2025 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 03/27/2025 8 AM 12 Good Hangar Fenceline - N Center 03/27/2025 8 AM 8 Good Hangar Fenceline - N Corner 03/27/2025 8 AM 7 Good Hangar Fenceline - NE Corner 03/27/2025 8 AM 10 Good Hangar Fenceline - S Side 03/27/2025 8 AM 12 Good Hangar Fenceline - SW Corner 03/27/2025 8 AM 12 Good Hangar Fenceline - SW Side 03/27/2025 8 AM 5 Good Hangar Fenceline - W Side 03/27/2025 8 AM ** ** Legacy Road 03/27/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Friday, March 28, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 03/28/2025 8 AM 11 Good Hangar Fenceline - E Side 03/28/2025 8 AM 13 Good Hangar Fenceline - N Center 03/28/2025 8 AM 9 Good Hangar Fenceline - N Corner 03/28/2025 8 AM 8 Good Hangar Fenceline - NE Corner 03/28/2025 8 AM 11 Good Hangar Fenceline - S Side 03/28/2025 8 AM 12 Good Hangar Fenceline - SW Corner 03/28/2025 8 AM 14 Good Hangar Fenceline - SW Side 03/28/2025 8 AM 6 Good Hangar Fenceline - W Side 03/28/2025 8 AM ** ** Legacy Road 03/28/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Saturday, March 29, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 03/29/2025 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - E Side 03/29/2025 8 AM 18 Good Hangar Fenceline - N Center 03/29/2025 8 AM 14 Good Hangar Fenceline - N Corner 03/29/2025 8 AM 12 Good Hangar Fenceline - NE Corner 03/29/2025 8 AM 15 Good Hangar Fenceline - S Side 03/29/2025 8 AM 15 Good Hangar Fenceline - SW Corner 03/29/2025 8 AM 17 Good Hangar Fenceline - SW Side 03/29/2025 8 AM 8 Good Hangar Fenceline - W Side 03/29/2025 8 AM 27 Good Legacy Road 03/29/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Sunday, March 30, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/30/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 03/30/2025 8 AM 15 Good Hangar Fenceline - N Center 03/30/2025 8 AM 11 Good Hangar Fenceline - N Corner 03/30/2025 8 AM 10 Good Hangar Fenceline - NE Corner 03/30/2025 8 AM 12 Good Hangar Fenceline - S Side 03/30/2025 8 AM 13 Good Hangar Fenceline - SW Corner 03/30/2025 8 AM 14 Good Hangar Fenceline - SW Side 03/30/2025 8 AM 7 Good Hangar Fenceline - W Side 03/30/2025 8 AM ** ** Legacy Road 03/30/2025 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Monday, March 31, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 03/31/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 03/31/2025 8 AM 10 Good Hangar Fenceline - N Center 03/31/2025 8 AM 7 Good Hangar Fenceline - N Corner 03/31/2025 8 AM 6 Good Hangar Fenceline - NE Corner 03/31/2025 8 AM 9 Good Hangar Fenceline - S Side 03/31/2025 8 AM ** ** Hangar Fenceline - SW Corner 03/31/2025 8 AM 9 Good Hangar Fenceline - SW Side 03/31/2025 8 AM 5 Good Hangar Fenceline - W Side 03/31/2025 8 AM 5 Good Legacy Road 03/31/2025 8 AM 5 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Tuesday, April 1, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/01/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 04/01/2025 8 AM 10 Good Hangar Fenceline - N Center 04/01/2025 8 AM 7 Good Hangar Fenceline - N Corner 04/01/2025 8 AM 6 Good Hangar Fenceline - NE Corner 04/01/2025 8 AM 8 Good Hangar Fenceline - S Side 04/01/2025 8 AM 10 Good Hangar Fenceline - SW Corner 04/01/2025 8 AM 9 Good Hangar Fenceline - SW Side 04/01/2025 8 AM 5 Good Hangar Fenceline - W Side 04/01/2025 8 AM 4 Good Legacy Road 04/01/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Wednesday, April 2, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/02/2025 8 AM Matter 13 Level of Concern Good Hangar Fenceline - E Side 04/02/2025 8 AM 14 Good Hangar Fenceline - N Center 04/02/2025 8 AM 10 Good Hangar Fenceline - N Corner 04/02/2025 8 AM 11 Good Hangar Fenceline - NE Corner 04/02/2025 8 AM 11 Good Hangar Fenceline - S Side 04/02/2025 8 AM 13 Good Hangar Fenceline - SW Corner 04/02/2025 8 AM 13 Good Hangar Fenceline - SW Side 04/02/2025 8 AM 7 Good Hangar Fenceline - W Side 04/02/2025 8 AM 7 Good Legacy Road 04/02/2025 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Thursday, April 3, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/03/2025 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - E Side 04/03/2025 8 AM 13 Good Hangar Fenceline - N Center 04/03/2025 8 AM 10 Good Hangar Fenceline - N Corner 04/03/2025 8 AM 9 Good Hangar Fenceline - NE Corner 04/03/2025 8 AM 10 Good Hangar Fenceline - S Side 04/03/2025 8 AM 13 Good Hangar Fenceline - SW Corner 04/03/2025 8 AM 12 Good Hangar Fenceline - SW Side 04/03/2025 8 AM 6 Good Hangar Fenceline - W Side 04/03/2025 8 AM 7 Good Legacy Road 04/03/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Friday, April 4, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/04/2025 8 AM Particulate Matter 15 Level of Concern Good Hangar Fenceline - E Side 04/04/2025 8 AM 12 Good Hangar Fenceline - N Center 04/04/2025 8 AM 10 Good Hangar Fenceline - N Corner 04/04/2025 8 AM 13 Good Hangar Fenceline - NE Corner 04/04/2025 8 AM 11 Good Hangar Fenceline - S Side 04/04/2025 8 AM 8 Good Hangar Fenceline - SW Corner 04/04/2025 8 AM 15 Good Hangar Fenceline - SW Side 04/04/2025 8 AM 7 Good Hangar Fenceline - W Side 04/04/2025 8 AM 12 Good Legacy Road 04/04/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Saturday, April 5, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/05/2025 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - E Side 04/05/2025 8 AM 13 Good Hangar Fenceline - N Center 04/05/2025 8 AM 10 Good Hangar Fenceline - N Corner 04/05/2025 8 AM 10 Good Hangar Fenceline - NE Corner 04/05/2025 8 AM 11 Good Hangar Fenceline - S Side 04/05/2025 8 AM 14 Good Hangar Fenceline - SW Corner 04/05/2025 8 AM 15 Good Hangar Fenceline - SW Side 04/05/2025 8 AM 8 Good Hangar Fenceline - W Side 04/05/2025 8 AM 7 Good Legacy Road 04/05/2025 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to /74 . • emergency • • • • • - likely tobe affected. Sunday, April 6, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/06/2025 8 AM Matter 6 Level of Concern Good Hangar Fenceline - E Side 04/06/2025 8 AM 9 Good Hangar Fenceline - N Center 04/06/2025 8 AM 7 Good Hangar Fenceline - N Corner 04/06/2025 8 AM 8 Good Hangar Fenceline - NE Corner 04/06/2025 8 AM 9 Good Hangar Fenceline - S Side 04/06/2025 8 AM 12 Good Hangar Fenceline - SW Corner 04/06/2025 8 AM 12 Good Hangar Fenceline - SW Side 04/06/2025 8 AM 6 Good Hangar Fenceline - W Side 04/06/2025 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. azardous 425 to 504 Health warning of emergency conditions: ever. . - likely ..- affected. Monday, April 7, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/07/2025 8 AM Particulate Matter 12 Level of Concern Good Hangar Fenceline - E Side 04/07/2025 8 AM 17 Good Hangar Fenceline - N Center 04/07/2025 8 AM 14 Good Hangar Fenceline - N Corner 04/07/2025 8 AM 12 Good Hangar Fenceline - NE Corner 04/07/2025 8 AM 15 Good Hangar Fenceline - S Side 04/07/2025 8 AM 16 Good Hangar Fenceline - SW Corner 04/07/2025 8 AM 20 Good Hangar Fenceline - SW Side 04/07/2025 8 AM 12 Good Hangar Fenceline - W Side 04/07/2025 8 AM 10 Good Legacy Road 04/07/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Tuesday, April 8, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/08/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 04/08/2025 8 AM 17 Good Hangar Fenceline - N Center 04/08/2025 8 AM 14 Good Hangar Fenceline - N Corner 04/08/2025 8 AM 13 Good Hangar Fenceline - NE Corner 04/08/2025 8 AM 15 Good Hangar Fenceline - S Side 04/08/2025 8 AM 16 Good Hangar Fenceline - SW Corner 04/08/2025 8 AM 20 Good Hangar Fenceline - SW Side 04/08/2025 8 AM 11 Good Hangar Fenceline - W Side 04/08/2025 8 AM 10 Good Legacy Road 04/08/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Wednesday, April 9, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. Columbus Square Park PeriodLocation 24-Hour Ending 04/09/2025 8 AM Particulate Matter 15 Level of Concern Good Hangar Fenceline - E Side 04/09/2025 8 AM 21 Good Hangar Fenceline - N Center 04/09/2025 8 AM 19 Good Hangar Fenceline - N Corner 04/09/2025 8 AM 15 Good Hangar Fenceline - NE Corner 04/09/2025 8 AM 19 Good Hangar Fenceline - S Side 04/09/2025 8 AM 17 Good Hangar Fenceline - SW Corner 04/09/2025 8 AM 25 Good Hangar Fenceline - SW Side 04/09/2025 8 AM 13 Good Hangar Fenceline - W Side 04/09/2025 8 AM 11 Good Legacy Road 04/09/2025 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to /74 . • emergency • • • • • - likely tobe affected. Thursday, April 10, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/10/2025 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - E Side 04/10/2025 8 AM 21 Good Hangar Fenceline - N Center 04/10/2025 8 AM 19 Good Hangar Fenceline - N Corner 04/10/2025 8 AM 16 Good Hangar Fenceline - NE Corner 04/10/2025 8 AM 19 Good Hangar Fenceline - S Side 04/10/2025 8 AM 18 Good Hangar Fenceline - SW Corner 04/10/2025 8 AM 26 Good Hangar Fenceline - SW Side 04/10/2025 8 AM 14 Good Hangar Fenceline - W Side 04/10/2025 8 AM 12 Good Legacy Road 04/10/2025 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Friday, April 11, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/11/2025 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 04/11/2025 8 AM 24 Good Hangar Fenceline - N Center 04/11/2025 8 AM 22 Good Hangar Fenceline - N Corner 04/11/2025 8 AM 19 Good Hangar Fenceline - NE Corner 04/11/2025 8 AM 22 Good Hangar Fenceline - S Side 04/11/2025 8 AM 20 Good Hangar Fenceline - SW Corner 04/11/2025 8 AM 31 Good Hangar Fenceline - SW Side 04/11/2025 8 AM 16 Good Hangar Fenceline - W Side 04/11/2025 8 AM 15 Good Legacy Road 04/11/2025 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Saturday, April 12, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 04/12/2025 8 AM 17 Good Hangar Fenceline - E Side 04/12/2025 8 AM 23 Good Hangar Fenceline - N Center 04/12/2025 8 AM 21 Good Hangar Fenceline - N Corner 04/12/2025 8 AM 17 Good Hangar Fenceline - NE Corner 04/12/2025 8 AM 21 Good Hangar Fenceline - S Side 04/12/2025 8 AM 19 Good Hangar Fenceline - SW Corner 04/12/2025 8 AM 29 Good Hangar Fenceline - SW Side 04/12/2025 8 AM 15 Good Hangar Fenceline - W Side 04/12/2025 8 AM 14 Good Legacy Road 04/12/2025 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Sunday, April 13, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/13/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 04/13/2025 8 AM 28 Good Hangar Fenceline - N Center 04/13/2025 8 AM 26 Good Hangar Fenceline - N Corner 04/13/2025 8 AM 24 Good Hangar Fenceline - NE Corner 04/13/2025 8 AM 26 Good Hangar Fenceline - S Side 04/13/2025 8 AM 25 Good Hangar Fenceline - SW Corner 04/13/2025 8 AM 40 Good Hangar Fenceline - SW Side 04/13/2025 8 AM 19 Good Hangar Fenceline - W Side 04/13/2025 8 AM 20 Good Legacy Road 04/13/2025 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Monday, April 14, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/14/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 04/14/2025 8 AM 22 Good Hangar Fenceline - N Center 04/14/2025 8 AM 20 Good Hangar Fenceline - N Corner 04/14/2025 8 AM 16 Good Hangar Fenceline - NE Corner 04/14/2025 8 AM 20 Good Hangar Fenceline - S Side 04/14/2025 8 AM 20 Good Hangar Fenceline - SW Corner 04/14/2025 8 AM 27 Good Hangar Fenceline - SW Side 04/14/2025 8 AM 14 Good Hangar Fenceline - W Side 04/14/2025 8 AM 13 Good Legacy Road 04/14/2025 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Tuesday, April 15, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/15/2025 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - E Side 04/15/2025 8 AM 21 Good Hangar Fenceline - N Center 04/15/2025 8 AM 19 Good Hangar Fenceline - N Corner 04/15/2025 8 AM 16 Good Hangar Fenceline - NE Corner 04/15/2025 8 AM 19 Good Hangar Fenceline - S Side 04/15/2025 8 AM 19 Good Hangar Fenceline - SW Corner 04/15/2025 8 AM 26 Good Hangar Fenceline - SW Side 04/15/2025 8 AM 13 Good Hangar Fenceline - W Side 04/15/2025 8 AM 13 Good Legacy Road 04/15/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Wednesday, April 16, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/16/2025 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - E Side 04/16/2025 8 AM 21 Good Hangar Fenceline - N Center 04/16/2025 8 AM 19 Good Hangar Fenceline - N Corner 04/16/2025 8 AM 16 Good Hangar Fenceline - NE Corner 04/16/2025 8 AM 19 Good Hangar Fenceline - S Side 04/16/2025 8 AM 19 Good Hangar Fenceline - SW Corner 04/16/2025 8 AM 26 Good Hangar Fenceline - SW Side 04/16/2025 8 AM 13 Good Hangar Fenceline - W Side 04/16/2025 8 AM 13 Good Legacy Road 04/16/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Thursday, April 17, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 04/17/2025 8 AM 7 Good Hangar Fenceline - E Side 04/17/2025 8 AM 11 Good Hangar Fenceline - N Center 04/17/2025 8 AM 11 Good Hangar Fenceline - N Corner 04/17/2025 8 AM 8 Good Hangar Fenceline - NE Corner 04/17/2025 8 AM 11 Good Hangar Fenceline - S Side 04/17/2025 8 AM 12 Good Hangar Fenceline - SW Corner 04/17/2025 8 AM ** ** Hangar Fenceline - SW Side 04/17/2025 8 AM 6 Good Hangar Fenceline - W Side 04/17/2025 8 AM 6 Good Legacy Road 04/17/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Friday April 18, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/18/2025 8 AM Matter 5 Level of Concern Good Hangar Fenceline - E Side 04/18/2025 8 AM 9 Good Hangar Fenceline - N Center 04/18/2025 8 AM 11 Good Hangar Fenceline - N Corner 04/18/2025 8 AM 6 Good Hangar Fenceline - NE Corner 04/18/2025 8 AM 9 Good Hangar Fenceline - S Side 04/18/2025 8 AM 11 Good Hangar Fenceline - SW Corner 04/18/2025 8 AM 5 Good Hangar Fenceline - SW Side 04/18/2025 8 AM 5 Good Hangar Fenceline - W Side 04/18/2025 8 AM 5 Good Legacy Road 04/18/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Saturday, April 19, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/19/2025 8 AM Particulate Matter 10 Level of Concern Good Hangar Fenceline - E Side 04/19/2025 8 AM 14 Good Hangar Fenceline - N Center 04/19/2025 8 AM 17 Good Hangar Fenceline - N Corner 04/19/2025 8 AM 10 Good Hangar Fenceline - NE Corner 04/19/2025 8 AM 13 Good Hangar Fenceline - S Side 04/19/2025 8 AM 14 Good Hangar Fenceline - SW Corner 04/19/2025 8 AM 8 Good Hangar Fenceline - SW Side 04/19/2025 8 AM 9 Good Hangar Fenceline - W Side 04/19/2025 8 AM 8 Good Legacy Road 04/19/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Sunday, April 20, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/20/2025 8 AM Particulate Matter 15 Level of Concern Good Hangar Fenceline - E Side 04/20/2025 8 AM 21 Good Hangar Fenceline - N Center 04/20/2025 8 AM 25 Good Hangar Fenceline - N Corner 04/20/2025 8 AM 16 Good Hangar Fenceline - NE Corner 04/20/2025 8 AM 19 Good Hangar Fenceline - S Side 04/20/2025 8 AM 19 Good Hangar Fenceline - SW Corner 04/20/2025 8 AM 15 Good Hangar Fenceline - SW Side 04/20/2025 8 AM 15 Good Hangar Fenceline - W Side 04/20/2025 8 AM 13 Good Legacy Road 04/20/2025 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 • 04 Health warning.emergencyT— more conditions:• - is likely • be affected. Monday, April 21, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/21/2025 8 AM Particulate Matter 22 Level of Concern Good Hangar Fenceline - E Side 04/21/2025 8 AM 29 Good Hangar Fenceline - N Center 04/21/2025 8 AM 34 Good Hangar Fenceline - N Corner 04/21/2025 8 AM 21 Good Hangar Fenceline - NE Corner 04/21/2025 8 AM 26 Good Hangar Fenceline - S Side 04/21/2025 8 AM 24 Good Hangar Fenceline - SW Corner 04/21/2025 8 AM 21 Good Hangar Fenceline - SW Side 04/21/2025 8 AM 20 Good Hangar Fenceline - W Side 04/21/2025 8 AM 18 Good Legacy Road 04/21/2025 8 AM 30 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 • 04 Health warning.emergencyT— more conditions:• - is likely • be affected. Tuesday, April 22, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/22/2025 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 04/22/2025 8 AM 24 Good Hangar Fenceline - N Center 04/22/2025 8 AM 29 Good Hangar Fenceline - N Corner 04/22/2025 8 AM 19 Good Hangar Fenceline - NE Corner 04/22/2025 8 AM 22 Good Hangar Fenceline - S Side 04/22/2025 8 AM 21 Good Hangar Fenceline - SW Corner 04/22/2025 8 AM 17 Good Hangar Fenceline - SW Side 04/22/2025 8 AM 17 Good Hangar Fenceline - W Side 04/22/2025 8 AM 15 Good Legacy Road 04/22/2025 8 AM 26 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 • 04 Health warning.emergencyT— more conditions:• - is likely • be affected. Wednesday, April 23, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/23/2025 8 AM Particulate Matter 13 Level of Concern Good Hangar Fenceline - E Side 04/23/2025 8 AM 17 Good Hangar Fenceline - N Center 04/23/2025 8 AM 23 Good Hangar Fenceline - N Corner 04/23/2025 8 AM 14 Good Hangar Fenceline - NE Corner 04/23/2025 8 AM 17 Good Hangar Fenceline - S Side 04/23/2025 8 AM 18 Good Hangar Fenceline - SW Corner 04/23/2025 8 AM 12 Good Hangar Fenceline - SW Side 04/23/2025 8 AM 13 Good Hangar Fenceline - W Side 04/23/2025 8 AM 12 Good Legacy Road 04/23/2025 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Thursday, April 24, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/24/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 04/24/2025 8 AM 11 Good Hangar Fenceline - N Center 04/24/2025 8 AM 19 Good Hangar Fenceline - N Corner 04/24/2025 8 AM 9 Good Hangar Fenceline - NE Corner 04/24/2025 8 AM 11 Good Hangar Fenceline - S Side 04/24/2025 8 AM 13 Good Hangar Fenceline - SW Corner 04/24/2025 8 AM 7 Good Hangar Fenceline - SW Side 04/24/2025 8 AM 8 Good Hangar Fenceline - W Side 04/24/2025 8 AM 8 Good Legacy Road 04/24/2025 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Friday, April 25, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/25/2025 8 AM Particulate Matter 11 Level of Concern Good Hangar Fenceline - E Side 04/25/2025 8 AM 15 Good Hangar Fenceline - N Center 04/25/2025 8 AM 23 Good Hangar Fenceline - N Corner 04/25/2025 8 AM 12 Good Hangar Fenceline - NE Corner 04/25/2025 8 AM 15 Good Hangar Fenceline - S Side 04/25/2025 8 AM 16 Good Hangar Fenceline - SW Corner 04/25/2025 8 AM 10 Good Hangar Fenceline - SW Side 04/25/2025 8 AM 11 Good Hangar Fenceline - W Side 04/25/2025 8 AM 10 Good Legacy Road 04/25/2025 8 AM 19 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Saturday, April 26, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/26/2025 8 AM Particulate Matter 6 Level of Concern Good Hangar Fenceline - E Side 04/26/2025 8 AM 7 Good Hangar Fenceline - N Center 04/26/2025 8 AM 17 Good Hangar Fenceline - N Corner 04/26/2025 8 AM 6 Good Hangar Fenceline - NE Corner 04/26/2025 8 AM 8 Good Hangar Fenceline - S Side 04/26/2025 8 AM 11 Good Hangar Fenceline - SW Corner 04/26/2025 8 AM 4 Good Hangar Fenceline - SW Side 04/26/2025 8 AM 5 Good Hangar Fenceline - W Side 04/26/2025 8 AM 5 Good Legacy Road 04/26/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Sunday, April 27, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction. Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 04/27/2025 8 AM Matter 5 Level of Concern Good Hangar Fenceline - E Side 04/27/2025 8 AM 6 Good Hangar Fenceline - N Center 04/27/2025 8 AM ** ** Hangar Fenceline - N Corner 04/27/2025 8 AM 4 Good Hangar Fenceline - NE Corner 04/27/2025 8 AM ** ** Hangar Fenceline - S Side 04/27/2025 8 AM 10 Good Hangar Fenceline - SW Corner 04/27/2025 8 AM 2 Good Hangar Fenceline - SW Side 04/27/2025 8 AM 4 Good Hangar Fenceline - W Side 04/27/2025 8 AM 4 Good Legacy Road 04/27/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected. Monday, April 28, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/28/2025 8 AM Particulate Matter 4 Level of Concern Good Hangar Fenceline - E Side 04/28/2025 8 AM 6 Good Hangar Fenceline - N Center 04/28/2025 8 AM 5 Good Hangar Fenceline - N Corner 04/28/2025 8 AM 5 Good Hangar Fenceline - NE Corner 04/28/2025 8 AM 7 Good Hangar Fenceline - S Side 04/28/2025 8 AM 10 Good Hangar Fenceline - SW Corner 04/28/2025 8 AM 3 Good Hangar Fenceline - SW Side 04/28/2025 8 AM 4 Good Hangar Fenceline - W Side 04/28/2025 8 AM 4 Good Legacy Road 04/28/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Tuesday, April 29, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction. Location Columbus Square Park 24-Hour Period Ending 04/29/2025 8 AM 10 Good Hangar Fenceline - E Side 04/29/2025 8 AM 12 Good Hangar Fenceline - N Center 04/29/2025 8 AM 12 Good Hangar Fenceline - N Corner 04/29/2025 8 AM 10 Good Hangar Fenceline - NE Corner 04/29/2025 8 AM ** ** Hangar Fenceline - S Side 04/29/2025 8 AM ** ** Hangar Fenceline - SW Corner 04/29/2025 8 AM 8 Good Hangar Fenceline - SW Side 04/29/2025 8 AM 9 Good Hangar Fenceline - W Side 04/29/2025 8 AM 8 Good Legacy Road 04/29/2025 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 17• • - •- • • • • • - likely • be -• Wednesday, April 30, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 04/30/2025 8 AM Particulate Matter 16 Level of Concern Good Hangar Fenceline - E Side 04/30/2025 8 AM 18 Good Hangar Fenceline - N Center 04/30/2025 8 AM 17 Good Hangar Fenceline - N Corner 04/30/2025 8 AM 15 Good Hangar Fenceline - NE Corner 04/30/2025 8 AM 20 Good Hangar Fenceline - S Side 04/30/2025 8 AM 19 Good Hangar Fenceline - SW Corner 04/30/2025 8 AM 15 Good Hangar Fenceline - SW Side 04/30/2025 8 AM 14 Good Hangar Fenceline - W Side 04/30/2025 8 AM 13 Good Legacy Road 04/30/2025 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health VIE effects is increased for everyone. 425 to 07.. emergency FM . . . everyone more likely ..- affected.