The URL can be used to link to this page

Home My WebLink AboutAir PM Results October 2024Tuesday, 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.