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Home My WebLink AboutAir PM Results January 2025Wednesday, January 1, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/01/2025 8 AM Matter 105 Level of Concern Moderate Hangar Fenceline - E Side 01/01/2025 8 AM 117 Moderate Hangar Fenceline - N Center 01/01/2025 8 AM 120 Moderate Hangar Fenceline - N Corner 01/01/2025 8 AM 89 Moderate Hangar Fenceline - NE Corner 01/01/2025 8 AM 120 Moderate Hangar Fenceline - NE Side 01/01/2025 8 AM 96 Moderate Hangar Fenceline - S Corner 01/01/2025 8 AM 90 Moderate Hangar Fenceline - S Side 01/01/2025 8 AM 106 Moderate Hangar Fenceline - SW Corner 01/01/2025 8 AM 191 Unhealthy for Sensitive Groups • •24-Hour Hangar Fenceline - SW Side Period • • 01/01/2025 8 AM Particulate Matter 108 Level of Concern Moderate Hangar Fenceline - W Side 01/01/2025 8 AM 93 Moderate Legacy Road 01/01/2025 8 AM 114 Moderate Moffett and Tustin Ranch 01/01/2025 8 AM 98 Moderate Valencia and Armstrong 01/01/2025 8 AM 122 Moderate Valencia and Columbus Square 01/01/2025 8 AM 126 Moderate Valencia and Legacy 01/01/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/01/2025 8 AM 92 Moderate Warner Avenue 01/01/2025 8 AM 106 Moderate Warner and Armstrong 01/01/2025 8 AM 104 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 5047 Health warning of emergency conditions: ever•ne is more likely to be affected. Thursday, January 2, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/02/2025 8 AM Matter 86 Level of Concern Moderate Hangar Fenceline - E Side 01/02/2025 8 AM 99 Moderate Hangar Fenceline - N Center 01/02/2025 8 AM 103 Moderate Hangar Fenceline - N Corner 01/02/2025 8 AM 72 Moderate Hangar Fenceline - NE Corner 01/02/2025 8 AM 96 Moderate Hangar Fenceline - NE Side 01/02/2025 8 AM 80 Moderate Hangar Fenceline - S Corner 01/02/2025 8 AM 70 Moderate Hangar Fenceline - S Side 01/02/2025 8 AM 84 Moderate Hangar Fenceline - SW Corner 01/02/2025 8 AM 107 Moderate Hangar Fenceline - SW Side 01/02/2025 8 AM 89 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/02/2025 8 AM Particulate Matter 76 Level of Concern Moderate Legacy Road 01/02/2025 8 AM 101 Moderate Moffett and Tustin Ranch 01/02/2025 8 AM 84 Moderate Valencia and Armstrong 01/02/2025 8 AM 98 Moderate Valencia and Columbus Square 01/02/2025 8 AM 105 Moderate Valencia and Legacy 01/02/2025 8 AM 51 Good Victory and Tustin Ranch Rd. 01/02/2025 8 AM 73 Moderate Warner Avenue 01/02/2025 8 AM 87 Moderate Warner and Armstrong 01/02/2025 8 AM 77 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 3, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/03/2025 8 AM Matter 59 Level of Concern Moderate Hangar Fenceline - E Side 01/03/2025 8 AM 66 Moderate Hangar Fenceline - N Center 01/03/2025 8 AM 74 Moderate Hangar Fenceline - N Corner 01/03/2025 8 AM 44 Good Hangar Fenceline - NE Corner 01/03/2025 8 AM 66 Moderate Hangar Fenceline - NE Side 01/03/2025 8 AM 47 Good Hangar Fenceline - S Corner 01/03/2025 8 AM 46 Good Hangar Fenceline - S Side 01/03/2025 8 AM 51 Good Hangar Fenceline - SW Corner 01/03/2025 8 AM 71 Moderate Hangar Fenceline - SW Side 01/03/2025 8 AM 62 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/03/2025 8 AM Particulate Matter 48 Level of Concern Good Legacy Road 01/03/2025 8 AM 60 Moderate Moffett and Tustin Ranch 01/03/2025 8 AM 58 Moderate Valencia and Armstrong 01/03/2025 8 AM 72 Moderate Valencia and Columbus Square 01/03/2025 8 AM 69 Moderate Valencia and Legacy 01/03/2025 8 AM 37 Good Victory and Tustin Ranch Rd. 01/03/2025 8 AM 40 Good Warner Avenue 01/03/2025 8 AM 61 Moderate Warner and Armstrong 01/03/2025 8 AM 41 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 4, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/04/2025 8 AM 59 Moderate Hangar Fenceline - E Side 01/04/2025 8 AM 64 Moderate Hangar Fenceline - N Center 01/04/2025 8 AM 65 Moderate Hangar Fenceline - N Corner 01/04/2025 8 AM 50 Good Hangar Fenceline - NE Corner 01/04/2025 8 AM 65 Moderate Hangar Fenceline - NE Side 01/04/2025 8 AM 49 Good Hangar Fenceline - S Corner 01/04/2025 8 AM 50 Good Hangar Fenceline - S Side 01/04/2025 8 AM 61 Moderate Hangar Fenceline - SW Corner 01/04/2025 8 AM 88 Moderate Hangar Fenceline - SW Side 01/04/2025 8 AM 62 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/04/2025 8 AM Particulate Matter 52 Level of Concern Good Legacy Road 01/04/2025 8 AM 62 Moderate Moffett and Tustin Ranch 01/04/2025 8 AM 58 Moderate Valencia and Armstrong 01/04/2025 8 AM 73 Moderate Valencia and Columbus Square 01/04/2025 8 AM 71 Moderate Valencia and Legacy 01/04/2025 8 AM 42 Good Victory and Tustin Ranch Rd. 01/04/2025 8 AM 53 Good Warner Avenue 01/04/2025 8 AM 59 Moderate Warner and Armstrong 01/04/2025 8 AM 58 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 5, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/05/2025 8 AM Matter 37 Level of Concern Good Hangar Fenceline - E Side 01/05/2025 8 AM 41 Good Hangar Fenceline - N Center 01/05/2025 8 AM 45 Good Hangar Fenceline - N Corner 01/05/2025 8 AM 29 Good Hangar Fenceline - NE Corner 01/05/2025 8 AM 41 Good Hangar Fenceline - NE Side 01/05/2025 8 AM 55 Moderate Hangar Fenceline - S Corner 01/05/2025 8 AM 31 Good Hangar Fenceline - S Side 01/05/2025 8 AM 35 Good Hangar Fenceline - SW Corner 01/05/2025 8 AM 49 Good Hangar Fenceline - SW Side 01/05/2025 8 AM 39 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/05/2025 8 AM Particulate Matter 34 Level of Concern Good Legacy Road 01/05/2025 8 AM 43 Good Moffett and Tustin Ranch 01/05/2025 8 AM 37 Good Valencia and Armstrong 01/05/2025 8 AM 43 Good Valencia and Columbus Square 01/05/2025 8 AM 43 Good Valencia and Legacy 01/05/2025 8 AM 24 Good Victory and Tustin Ranch Rd. 01/05/2025 8 AM 31 Good Warner Avenue 01/05/2025 8 AM 38 Good Warner and Armstrong 01/05/2025 8 AM 37 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 6, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/06/2025 8 AM Matter 30 Level of Concern Good Hangar Fenceline - E Side 01/06/2025 8 AM 32 Good Hangar Fenceline - N Center 01/06/2025 8 AM 33 Good Hangar Fenceline - N Corner 01/06/2025 8 AM 27 Good Hangar Fenceline - NE Corner 01/06/2025 8 AM 32 Good Hangar Fenceline - NE Side 01/06/2025 8 AM 50 Good Hangar Fenceline - S Corner 01/06/2025 8 AM 27 Good Hangar Fenceline - S Side 01/06/2025 8 AM 31 Good Hangar Fenceline - SW Corner 01/06/2025 8 AM 42 Good Hangar Fenceline - SW Side 01/06/2025 8 AM 28 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/06/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 01/06/2025 8 AM 30 Good Moffett and Tustin Ranch 01/06/2025 8 AM 31 Good Valencia and Armstrong 01/06/2025 8 AM 43 Good Valencia and Columbus Square 01/06/2025 8 AM 35 Good Valencia and Legacy 01/06/2025 8 AM 22 Good Victory and Tustin Ranch Rd. 01/06/2025 8 AM 27 Good Warner Avenue 01/06/2025 8 AM 31 Good Warner and Armstrong 01/06/2025 8 AM 29 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 7, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/07/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 01/07/2025 8 AM 15 Good Hangar Fenceline - N Center 01/07/2025 8 AM 17 Good Hangar Fenceline - N Corner 01/07/2025 8 AM 14 Good Hangar Fenceline - NE Corner 01/07/2025 8 AM 16 Good Hangar Fenceline - NE Side 01/07/2025 8 AM 36 Good Hangar Fenceline - S Corner 01/07/2025 8 AM 14 Good Hangar Fenceline - S Side 01/07/2025 8 AM 14 Good Hangar Fenceline - SW Corner 01/07/2025 8 AM 19 Good Hangar Fenceline - SW Side 01/07/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/07/2025 8 AM Particulate Matter 20 Level of Concern Good Legacy Road 01/07/2025 8 AM 14 Good Moffett and Tustin Ranch 01/07/2025 8 AM 13 Good Valencia and Armstrong 01/07/2025 8 AM 23 Good Valencia and Columbus Square 01/07/2025 8 AM 16 Good Valencia and Legacy 01/07/2025 8 AM 10 Good Victory and Tustin Ranch Rd. 01/07/2025 8 AM 9 Good Warner Avenue 01/07/2025 8 AM 14 Good Warner and Armstrong 01/07/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 8, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/08/2025 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 01/08/2025 8 AM 9 Good Hangar Fenceline - N Center 01/08/2025 8 AM 8 Good Hangar Fenceline - N Corner 01/08/2025 8 AM 8 Good Hangar Fenceline - NE Corner 01/08/2025 8 AM ** ** Hangar Fenceline - NE Side 01/08/2025 8 AM 4 Good Hangar Fenceline - S Corner 01/08/2025 8 AM 8 Good Hangar Fenceline - S Side 01/08/2025 8 AM 18 Good Hangar Fenceline - SW Corner 01/08/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/08/2025 8 AM 5 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/08/2025 8 AM Particulate Matter 5 Level of Concern Good Legacy Road 01/08/2025 8 AM ** ** Moffett and Tustin Ranch 01/08/2025 8 AM 22 Good Valencia and Armstrong 01/08/2025 8 AM 21 Good Valencia and Columbus Square 01/08/2025 8 AM 9 Good Valencia and Legacy 01/08/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/08/2025 8 AM 7 Good Warner Avenue 01/08/2025 8 AM 17 Good Warner and Armstrong 01/08/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 9, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/09/2025 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 01/09/2025 8 AM 10 Good Hangar Fenceline - N Center 01/09/2025 8 AM 11 Good Hangar Fenceline - N Corner 01/09/2025 8 AM 9 Good Hangar Fenceline - NE Corner 01/09/2025 8 AM 9 Good Hangar Fenceline - NE Side 01/09/2025 8 AM ** ** Hangar Fenceline - S Corner 01/09/2025 8 AM 6 Good Hangar Fenceline - S Side 01/09/2025 8 AM ** ** Hangar Fenceline - SW Corner 01/09/2025 8 AM 12 Good Hangar Fenceline - SW Side 01/09/2025 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/09/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/09/2025 8 AM 8 Good Moffett and Tustin Ranch 01/09/2025 8 AM 12 Good Valencia and Armstrong 01/09/2025 8 AM 15 Good Valencia and Columbus Square 01/09/2025 8 AM 9 Good Valencia and Legacy 01/09/2025 8 AM 6 Good Victory and Tustin Ranch Rd. 01/09/2025 8 AM 8 Good Warner Avenue 01/09/2025 8 AM 9 Good Warner and Armstrong 01/09/2025 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 10, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/10/2025 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 01/10/2025 8 AM 11 Good Hangar Fenceline - N Center 01/10/2025 8 AM 11 Good Hangar Fenceline - N Corner 01/10/2025 8 AM 9 Good Hangar Fenceline - NE Corner 01/10/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/10/2025 8 AM 14 Good Hangar Fenceline - S Corner 01/10/2025 8 AM ** ** Hangar Fenceline - S Side 01/10/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/10/2025 8 AM 13 Good Hangar Fenceline - SW Side 01/10/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 01/10/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/10/2025 8 AM 10 Good Moffett and Tustin Ranch 01/10/2025 8 AM 12 Good Valencia and Armstrong 01/10/2025 8 AM 19 Good Valencia and Columbus Square 01/10/2025 8 AM 11 Good Valencia and Legacy 01/10/2025 8 AM 11 Good Victory and Tustin Ranch Rd. 01/10/2025 8 AM 9 Good Warner Avenue 01/10/2025 8 AM 11 Good Warner and Armstrong 01/10/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 11, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/11/2025 8 AM Matter 18 Level of Concern Good Hangar Fenceline - E Side 01/11/2025 8 AM 22 Good Hangar Fenceline - N Center 01/11/2025 8 AM 22 Good Hangar Fenceline - N Corner 01/11/2025 8 AM 19 Good Hangar Fenceline - NE Corner 01/11/2025 8 AM 27 Good Hangar Fenceline - NE Side 01/11/2025 8 AM 22 Good Hangar Fenceline - S Corner 01/11/2025 8 AM 21 Good Hangar Fenceline - S Side 01/11/2025 8 AM 24 Good Hangar Fenceline - SW Corner 01/11/2025 8 AM 27 Good Hangar Fenceline - SW Side 01/11/2025 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/11/2025 8 AM Particulate Matter 17 Level of Concern Good Legacy Road 01/11/2025 8 AM 19 Good Moffett and Tustin Ranch 01/11/2025 8 AM 22 Good Valencia and Armstrong 01/11/2025 8 AM 26 Good Valencia and Columbus Square 01/11/2025 8 AM 22 Good Valencia and Legacy 01/11/2025 8 AM 17 Good Victory and Tustin Ranch Rd. 01/11/2025 8 AM ** ** Warner Avenue 01/11/2025 8 AM 21 Good Warner and Armstrong 01/11/2025 8 AM 23 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 12, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/12/2025 8 AM Matter 5 Level of Concern Good Hangar Fenceline - E Side 01/12/2025 8 AM 7 Good Hangar Fenceline - N Center 01/12/2025 8 AM 8 Good Hangar Fenceline - N Corner 01/12/2025 8 AM 6 Good Hangar Fenceline - NE Corner 01/12/2025 8 AM 10 Good Hangar Fenceline - NE Side 01/12/2025 8 AM 12 Good Hangar Fenceline - S Corner 01/12/2025 8 AM ** ** Hangar Fenceline - S Side 01/12/2025 8 AM 7 Good Hangar Fenceline - SW Corner 01/12/2025 8 AM 9 Good Hangar Fenceline - SW Side 01/12/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 01/12/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/12/2025 8 AM 7 Good Moffett and Tustin Ranch 01/12/2025 8 AM 8 Good Valencia and Armstrong 01/12/2025 8 AM 15 Good Valencia and Columbus Square 01/12/2025 8 AM 8 Good Valencia and Legacy 01/12/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/12/2025 8 AM 8 Good Warner Avenue 01/12/2025 8 AM 7 Good Warner and Armstrong 01/12/2025 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 13, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/13/2025 8 AM 2 Good Hangar Fenceline - E Side 01/13/2025 8 AM 2 Good Hangar Fenceline - N Center 01/13/2025 8 AM 2 Good Hangar Fenceline - N Corner 01/13/2025 8 AM 1 Good Hangar Fenceline - NE Corner 01/13/2025 8 AM ** ** Hangar Fenceline - NE Side 01/13/2025 8 AM ** ** Hangar Fenceline - S Corner 01/13/2025 8 AM 2 Good Hangar Fenceline - S Side 01/13/2025 8 AM 2 Good Hangar Fenceline - SW Corner 01/13/2025 8 AM 2 Good Hangar Fenceline - SW Side 01/13/2025 8 AM 4 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/13/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/13/2025 8 AM 2 Good Moffett and Tustin Ranch 01/13/2025 8 AM 3 Good Valencia and Armstrong 01/13/2025 8 AM 4 Good Valencia and Columbus Square 01/13/2025 8 AM ** ** Valencia and Legacy 01/13/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/13/2025 8 AM 4 Good Warner Avenue 01/13/2025 8 AM 2 Good Warner and Armstrong 01/13/2025 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 14, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/14/2025 8 AM 2 Good Hangar Fenceline - E Side 01/14/2025 8 AM 3 Good Hangar Fenceline - N Center 01/14/2025 8 AM 3 Good Hangar Fenceline - N Corner 01/14/2025 8 AM 2 Good Hangar Fenceline - NE Corner 01/14/2025 8 AM 3 Good Hangar Fenceline - NE Side 01/14/2025 8 AM 2 Good Hangar Fenceline - S Corner 01/14/2025 8 AM 3 Good Hangar Fenceline - S Side 01/14/2025 8 AM ** ** Hangar Fenceline - SW Corner 01/14/2025 8 AM 4 Good Hangar Fenceline - SW Side 01/14/2025 8 AM 4 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/14/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/14/2025 8 AM 2 Good Moffett and Tustin Ranch 01/14/2025 8 AM 4 Good Valencia and Armstrong 01/14/2025 8 AM 4 Good Valencia and Columbus Square 01/14/2025 8 AM 2 Good Valencia and Legacy 01/14/2025 8 AM ** ** Victory and Tustin Ranch Rd. 01/14/2025 8 AM 5 Good Warner Avenue 01/14/2025 8 AM 3 Good Warner and Armstrong 01/14/2025 8 AM 3 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 15, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/15/2025 8 AM Matter 6 Level of Concern Good Hangar Fenceline - E Side 01/15/2025 8 AM 9 Good Hangar Fenceline - N Center 01/15/2025 8 AM 8 Good Hangar Fenceline - N Corner 01/15/2025 8 AM 7 Good Hangar Fenceline - NE Corner 01/15/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/15/2025 8 AM 8 Good Hangar Fenceline - S Corner 01/15/2025 8 AM 8 Good Hangar Fenceline - S Side 01/15/2025 8 AM 9 Good Hangar Fenceline - SW Corner 01/15/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/15/2025 8 AM 6 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/15/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/15/2025 8 AM 7 Good Moffett and Tustin Ranch 01/15/2025 8 AM 10 Good Valencia and Armstrong 01/15/2025 8 AM 9 Good Valencia and Columbus Square 01/15/2025 8 AM 6 Good Valencia and Legacy 01/15/2025 8 AM 5 Good Victory and Tustin Ranch Rd. 01/15/2025 8 AM 10 Good Warner Avenue 01/15/2025 8 AM 9 Good Warner and Armstrong 01/15/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 16, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/16/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/16/2025 8 AM 9 Good Hangar Fenceline - N Center 01/16/2025 8 AM 9 Good Hangar Fenceline - N Corner 01/16/2025 8 AM 9 Good Hangar Fenceline - NE Corner 01/16/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/16/2025 8 AM 11 Good Hangar Fenceline - S Corner 01/16/2025 8 AM 9 Good Hangar Fenceline - S Side 01/16/2025 8 AM 8 Good Hangar Fenceline - SW Corner 01/16/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/16/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/16/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/16/2025 8 AM ** ** Moffett and Tustin Ranch 01/16/2025 8 AM 10 Good Valencia and Armstrong 01/16/2025 8 AM 12 Good Valencia and Columbus Square 01/16/2025 8 AM 8 Good Valencia and Legacy 01/16/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 01/16/2025 8 AM 11 Good Warner Avenue 01/16/2025 8 AM 8 Good Warner and Armstrong 01/16/2025 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 17, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/17/2025 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 01/17/2025 8 AM 12 Good Hangar Fenceline - N Center 01/17/2025 8 AM 13 Good Hangar Fenceline - N Corner 01/17/2025 8 AM 10 Good Hangar Fenceline - NE Corner 01/17/2025 8 AM 15 Good Hangar Fenceline - NE Side 01/17/2025 8 AM 13 Good Hangar Fenceline - S Corner 01/17/2025 8 AM 11 Good Hangar Fenceline - S Side 01/17/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/17/2025 8 AM 15 Good Hangar Fenceline - SW Side 01/17/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 01/17/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/17/2025 8 AM 10 Good Moffett and Tustin Ranch 01/17/2025 8 AM 12 Good Valencia and Armstrong 01/17/2025 8 AM 12 Good Valencia and Columbus Square 01/17/2025 8 AM ** ** Valencia and Legacy 01/17/2025 8 AM 10 Good Victory and Tustin Ranch Rd. 01/17/2025 8 AM 12 Good Warner Avenue 01/17/2025 8 AM 10 Good Warner and Armstrong 01/17/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 18, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/18/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/18/2025 8 AM 11 Good Hangar Fenceline - N Center 01/18/2025 8 AM 11 Good Hangar Fenceline - N Corner 01/18/2025 8 AM ** ** Hangar Fenceline - NE Corner 01/18/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/18/2025 8 AM 11 Good Hangar Fenceline - S Corner 01/18/2025 8 AM 8 Good Hangar Fenceline - S Side 01/18/2025 8 AM 9 Good Hangar Fenceline - SW Corner 01/18/2025 8 AM 12 Good Hangar Fenceline - SW Side 01/18/2025 8 AM 34 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/18/2025 8 AM Particulate Matter 14 Level of Concern Good Legacy Road 01/18/2025 8 AM 9 Good Moffett and Tustin Ranch 01/18/2025 8 AM 10 Good Valencia and Armstrong 01/18/2025 8 AM 13 Good Valencia and Columbus Square 01/18/2025 8 AM 10 Good Valencia and Legacy 01/18/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 01/18/2025 8 AM 11 Good Warner Avenue 01/18/2025 8 AM 10 Good Warner and Armstrong 01/18/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 19, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/19/2025 8 AM Matter 22 Level of Concern Good Hangar Fenceline - E Side 01/19/2025 8 AM 26 Good Hangar Fenceline - N Center 01/19/2025 8 AM 30 Good Hangar Fenceline - N Corner 01/19/2025 8 AM 19 Good Hangar Fenceline - NE Corner 01/19/2025 8 AM 27 Good Hangar Fenceline - NE Side 01/19/2025 8 AM 27 Good Hangar Fenceline - S Corner 01/19/2025 8 AM 22 Good Hangar Fenceline - S Side 01/19/2025 8 AM 25 Good Hangar Fenceline - SW Corner 01/19/2025 8 AM 36 Good Hangar Fenceline - SW Side 01/19/2025 8 AM 50 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/19/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/19/2025 8 AM 28 Good Moffett and Tustin Ranch 01/19/2025 8 AM 25 Good Valencia and Armstrong 01/19/2025 8 AM 29 Good Valencia and Columbus Square 01/19/2025 8 AM 27 Good Valencia and Legacy 01/19/2025 8 AM 19 Good Victory and Tustin Ranch Rd. 01/19/2025 8 AM 25 Good Warner Avenue 01/19/2025 8 AM 26 Good Warner and Armstrong 01/19/2025 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 20, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/20/2025 8 AM Matter 73 Level of Concern Moderate Hangar Fenceline - E Side 01/20/2025 8 AM 50 Good Hangar Fenceline - N Center 01/20/2025 8 AM 56 Moderate Hangar Fenceline - N Corner 01/20/2025 8 AM 41 Good Hangar Fenceline - NE Corner 01/20/2025 8 AM 55 Moderate Hangar Fenceline - NE Side 01/20/2025 8 AM 53 Good Hangar Fenceline - S Corner 01/20/2025 8 AM ** ** Hangar Fenceline - S Side 01/20/2025 8 AM 50 Good Hangar Fenceline - SW Corner 01/20/2025 8 AM 75 Moderate Hangar Fenceline - SW Side 01/20/2025 8 AM 73 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 01/20/2025 8 AM Particulate Matter 39 Level of Concern Good Legacy Road 01/20/2025 8 AM 51 Good Moffett and Tustin Ranch 01/20/2025 8 AM 46 Good Valencia and Armstrong 01/20/2025 8 AM 56 Moderate Valencia and Columbus Square 01/20/2025 8 AM 56 Moderate Valencia and Legacy 01/20/2025 8 AM 40 Good Victory and Tustin Ranch Rd. 01/20/2025 8 AM 41 Good Warner Avenue 01/20/2025 8 AM 49 Good Warner and Armstrong 01/20/2025 8 AM 45 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 21, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/21/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/21/2025 8 AM 11 Good Hangar Fenceline - N Center 01/21/2025 8 AM 14 Good Hangar Fenceline - N Corner 01/21/2025 8 AM 11 Good Hangar Fenceline - NE Corner 01/21/2025 8 AM 11 Good Hangar Fenceline - NE Side 01/21/2025 8 AM 14 Good Hangar Fenceline - S Corner 01/21/2025 8 AM 11 Good Hangar Fenceline - S Side 01/21/2025 8 AM 12 Good Hangar Fenceline - SW Corner 01/21/2025 8 AM 18 Good Hangar Fenceline - SW Side 01/21/2025 8 AM 34 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/21/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/21/2025 8 AM ** ** Moffett and Tustin Ranch 01/21/2025 8 AM 16 Good Valencia and Armstrong 01/21/2025 8 AM 25 Good Valencia and Columbus Square 01/21/2025 8 AM 12 Good Valencia and Legacy 01/21/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 01/21/2025 8 AM 12 Good Warner Avenue 01/21/2025 8 AM 16 Good Warner and Armstrong 01/21/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 22, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. Columbus Square Park PeriodLocation 24-Hour Ending 01/22/2025 8 AM Particulate Matter 8 Level of Concern Good Hangar Fenceline - E Side 01/22/2025 8 AM 2 Good Hangar Fenceline - N Center 01/22/2025 8 AM 10 Good Hangar Fenceline - N Corner 01/22/2025 8 AM 8 Good Hangar Fenceline - NE Corner 01/22/2025 8 AM 2 Good Hangar Fenceline - NE Side 01/22/2025 8 AM 9 Good Hangar Fenceline - S Corner 01/22/2025 8 AM 8 Good Hangar Fenceline - S Side 01/22/2025 8 AM 7 Good Hangar Fenceline - SW Corner 01/22/2025 8 AM 11 Good Hangar Fenceline - SW Side 01/22/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/22/2025 8 AM Particulate Matter 5 Level of Concern Good Legacy Road 01/22/2025 8 AM 8 Good Moffett and Tustin Ranch 01/22/2025 8 AM 12 Good Valencia and Armstrong 01/22/2025 8 AM 12 Good Valencia and Columbus Square 01/22/2025 8 AM 7 Good Valencia and Legacy 01/22/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 01/22/2025 8 AM 8 Good Warner Avenue 01/22/2025 8 AM 9 Good Warner and Armstrong 01/22/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 23, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/23/2025 8 AM 18 Good Hangar Fenceline - E Side 01/23/2025 8 AM ** ** Hangar Fenceline - N Center 01/23/2025 8 AM 27 Good Hangar Fenceline - N Corner 01/23/2025 8 AM 23 Good Hangar Fenceline - NE Corner 01/23/2025 8 AM ** ** Hangar Fenceline - NE Side 01/23/2025 8 AM 28 Good Hangar Fenceline - S Corner 01/23/2025 8 AM 28 Good Hangar Fenceline - S Side 01/23/2025 8 AM 26 Good Hangar Fenceline - SW Corner 01/23/2025 8 AM 36 Good Hangar Fenceline - SW Side 01/23/2025 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/23/2025 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 01/23/2025 8 AM 28 Good Moffett and Tustin Ranch 01/23/2025 8 AM 36 Good Valencia and Armstrong 01/23/2025 8 AM 35 Good Valencia and Columbus Square 01/23/2025 8 AM 22 Good Valencia and Legacy 01/23/2025 8 AM 22 Good Victory and Tustin Ranch Rd. 01/23/2025 8 AM 46 Good Warner Avenue 01/23/2025 8 AM 21 Good Warner and Armstrong 01/23/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 24, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/24/2025 8 AM Matter 5 Level of Concern Good Hangar Fenceline - E Side 01/24/2025 8 AM ** ** Hangar Fenceline - N Center 01/24/2025 8 AM 7 Good Hangar Fenceline - N Corner 01/24/2025 8 AM 7 Good Hangar Fenceline - NE Corner 01/24/2025 8 AM ** ** Hangar Fenceline - NE Side 01/24/2025 8 AM 6 Good Hangar Fenceline - S Corner 01/24/2025 8 AM 6 Good Hangar Fenceline - S Side 01/24/2025 8 AM 4 Good Hangar Fenceline - SW Corner 01/24/2025 8 AM 8 Good Hangar Fenceline - SW Side 01/24/2025 8 AM 4 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/24/2025 8 AM Particulate Matter 3 Level of Concern Good Legacy Road 01/24/2025 8 AM 4 Good Moffett and Tustin Ranch 01/24/2025 8 AM ** ** Valencia and Armstrong 01/24/2025 8 AM 7 Good Valencia and Columbus Square 01/24/2025 8 AM 3 Good Valencia and Legacy 01/24/2025 8 AM 3 Good Victory and Tustin Ranch Rd. 01/24/2025 8 AM 6 Good Warner Avenue 01/24/2025 8 AM 6 Good Warner and Armstrong 01/24/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, January 25, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/25/2025 8 AM Matter 10 Level of Concern Good Hangar Fenceline - E Side 01/25/2025 8 AM 3 Good Hangar Fenceline - N Center 01/25/2025 8 AM 13 Good Hangar Fenceline - N Corner 01/25/2025 8 AM 11 Good Hangar Fenceline - NE Corner 01/25/2025 8 AM 2 Good Hangar Fenceline - NE Side 01/25/2025 8 AM 11 Good Hangar Fenceline - S Corner 01/25/2025 8 AM 11 Good Hangar Fenceline - S Side 01/25/2025 8 AM 9 Good Hangar Fenceline - SW Corner 01/25/2025 8 AM 14 Good Hangar Fenceline - SW Side 01/25/2025 8 AM 9 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/25/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/25/2025 8 AM 8 Good Moffett and Tustin Ranch 01/25/2025 8 AM 13 Good Valencia and Armstrong 01/25/2025 8 AM 12 Good Valencia and Columbus Square 01/25/2025 8 AM 9 Good Valencia and Legacy 01/25/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 01/25/2025 8 AM ** ** Warner Avenue 01/25/2025 8 AM 8 Good Warner and Armstrong 01/25/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, January 26, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/26/2025 8 AM Matter 12 Level of Concern Good Hangar Fenceline - E Side 01/26/2025 8 AM ** ** Hangar Fenceline - N Center 01/26/2025 8 AM 15 Good Hangar Fenceline - N Corner 01/26/2025 8 AM 12 Good Hangar Fenceline - NE Corner 01/26/2025 8 AM ** ** Hangar Fenceline - NE Side 01/26/2025 8 AM 14 Good Hangar Fenceline - S Corner 01/26/2025 8 AM 12 Good Hangar Fenceline - S Side 01/26/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/26/2025 8 AM 16 Good Hangar Fenceline - SW Side 01/26/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/26/2025 8 AM Particulate Matter 9 Level of Concern Good Legacy Road 01/26/2025 8 AM 10 Good Moffett and Tustin Ranch 01/26/2025 8 AM 13 Good Valencia and Armstrong 01/26/2025 8 AM ** ** Valencia and Columbus Square 01/26/2025 8 AM 13 Good Valencia and Legacy 01/26/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 01/26/2025 8 AM ** ** Warner Avenue 01/26/2025 8 AM 7 Good Warner and Armstrong 01/26/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, January 27, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/27/2025 8 AM 4 Good Hangar Fenceline - E Side 01/27/2025 8 AM ** ** Hangar Fenceline - N Center 01/27/2025 8 AM 6 Good Hangar Fenceline - N Corner 01/27/2025 8 AM 4 Good Hangar Fenceline - NE Corner 01/27/2025 8 AM ** ** Hangar Fenceline - NE Side 01/27/2025 8 AM 5 Good Hangar Fenceline - S Corner 01/27/2025 8 AM ** ** Hangar Fenceline - S Side 01/27/2025 8 AM 3 Good Hangar Fenceline - SW Corner 01/27/2025 8 AM ** ** Hangar Fenceline - SW Side 01/27/2025 8 AM 3 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/27/2025 8 AM Particulate Matter 3 Level of Concern Good Legacy Road 01/27/2025 8 AM 4 Good Moffett and Tustin Ranch 01/27/2025 8 AM 4 Good Valencia and Armstrong 01/27/2025 8 AM 5 Good Valencia and Columbus Square 01/27/2025 8 AM 5 Good Valencia and Legacy 01/27/2025 8 AM 3 Good Victory and Tustin Ranch Rd. 01/27/2025 8 AM ** ** Warner Avenue 01/27/2025 8 AM 3 Good Warner and Armstrong 01/27/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, January 28, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/28/2025 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 01/28/2025 8 AM ** ** Hangar Fenceline - N Center 01/28/2025 8 AM 14 Good Hangar Fenceline - N Corner 01/28/2025 8 AM 10 Good Hangar Fenceline - NE Corner 01/28/2025 8 AM ** ** Hangar Fenceline - NE Side 01/28/2025 8 AM 12 Good Hangar Fenceline - S Corner 01/28/2025 8 AM ** ** Hangar Fenceline - S Side 01/28/2025 8 AM 11 Good Hangar Fenceline - SW Corner 01/28/2025 8 AM 16 Good Hangar Fenceline - SW Side 01/28/2025 8 AM 11 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/28/2025 8 AM Particulate Matter 7 Level of Concern Good Legacy Road 01/28/2025 8 AM 11 Good Moffett and Tustin Ranch 01/28/2025 8 AM ** ** Valencia and Armstrong 01/28/2025 8 AM 12 Good Valencia and Columbus Square 01/28/2025 8 AM ** ** Valencia and Legacy 01/28/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 01/28/2025 8 AM ** ** Warner Avenue 01/28/2025 8 AM 5 Good Warner and Armstrong 01/28/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, January 29, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 01/29/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 01/29/2025 8 AM ** ** Hangar Fenceline - N Center 01/29/2025 8 AM 24 Good Hangar Fenceline - N Corner 01/29/2025 8 AM 15 Good Hangar Fenceline - NE Corner 01/29/2025 8 AM ** ** Hangar Fenceline - NE Side 01/29/2025 8 AM ** ** Hangar Fenceline - S Corner 01/29/2025 8 AM 18 Good Hangar Fenceline - S Side 01/29/2025 8 AM ** ** Hangar Fenceline - SW Corner 01/29/2025 8 AM 25 Good Hangar Fenceline - SW Side 01/29/2025 8 AM 18 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/29/2025 8 AM Particulate Matter 8 Level of Concern Good Legacy Road 01/29/2025 8 AM 17 Good Moffett and Tustin Ranch 01/29/2025 8 AM 17 Good Valencia and Armstrong 01/29/2025 8 AM 19 Good Valencia and Columbus Square 01/29/2025 8 AM 19 Good Valencia and Legacy 01/29/2025 8 AM 14 Good Victory and Tustin Ranch Rd. 01/29/2025 8 AM 15 Good Warner Avenue 01/29/2025 8 AM 7 Good Warner and Armstrong 01/29/2025 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, January 30, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/30/2025 8 AM 23 Good Hangar Fenceline - E Side 01/30/2025 8 AM ** ** Hangar Fenceline - N Center 01/30/2025 8 AM 27 Good Hangar Fenceline - N Corner 01/30/2025 8 AM 20 Good Hangar Fenceline - NE Corner 01/30/2025 8 AM ** ** Hangar Fenceline - NE Side 01/30/2025 8 AM 23 Good Hangar Fenceline - S Corner 01/30/2025 8 AM 23 Good Hangar Fenceline - S Side 01/30/2025 8 AM 21 Good Hangar Fenceline - SW Corner 01/30/2025 8 AM 31 Good Hangar Fenceline - SW Side 01/30/2025 8 AM 22 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/30/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 01/30/2025 8 AM 21 Good Moffett and Tustin Ranch 01/30/2025 8 AM 21 Good Valencia and Armstrong 01/30/2025 8 AM 25 Good Valencia and Columbus Square 01/30/2025 8 AM 23 Good Valencia and Legacy 01/30/2025 8 AM 19 Good Victory and Tustin Ranch Rd. 01/30/2025 8 AM ** ** Warner Avenue 01/30/2025 8 AM 16 Good Warner and Armstrong 01/30/2025 8 AM 18 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, January 31, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 01/31/2025 8 AM 20 Good Hangar Fenceline - E Side 01/31/2025 8 AM ** ** Hangar Fenceline - N Center 01/31/2025 8 AM 27 Good Hangar Fenceline - N Corner 01/31/2025 8 AM 17 Good Hangar Fenceline - NE Corner 01/31/2025 8 AM ** ** Hangar Fenceline - NE Side 01/31/2025 8 AM 21 Good Hangar Fenceline - S Corner 01/31/2025 8 AM 20 Good Hangar Fenceline - S Side 01/31/2025 8 AM 18 Good Hangar Fenceline - SW Corner 01/31/2025 8 AM 28 Good Hangar Fenceline - SW Side 01/31/2025 8 AM 20 Good • •24-Hour Hangar Fenceline - W Side Period • • 01/31/2025 8 AM Particulate Matter 10 Level of Concern Good Legacy Road 01/31/2025 8 AM 17 Good Moffett and Tustin Ranch 01/31/2025 8 AM 19 Good Valencia and Armstrong 01/31/2025 8 AM 21 Good Valencia and Columbus Square 01/31/2025 8 AM 20 Good Valencia and Legacy 01/31/2025 8 AM 16 Good Victory and Tustin Ranch Rd. 01/31/2025 8 AM 17 Good Warner Avenue 01/31/2025 8 AM 17 Good Warner and Armstrong 01/31/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected.