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HomeMy WebLinkAboutAir PM Results February 2025Saturday, February 1, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 02/01/2025 8 AM 52 Good Hangar Fenceline - E Side 02/01/2025 8 AM ** ** Hangar Fenceline - N Center 02/01/2025 8 AM 61 Moderate Hangar Fenceline - N Corner 02/01/2025 8 AM 43 Good Hangar Fenceline - NE Corner 02/01/2025 8 AM ** ** Hangar Fenceline - NE Side 02/01/2025 8 AM 51 Good Hangar Fenceline - S Corner 02/01/2025 8 AM 51 Good Hangar Fenceline - S Side 02/01/2025 8 AM 48 Good Hangar Fenceline - SW Corner 02/01/2025 8 AM 75 Moderate Hangar Fenceline - SW Side 02/01/2025 8 AM 51 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/01/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/01/2025 8 AM ** ** Moffett and Tustin Ranch 02/01/2025 8 AM 47 Good Valencia and Armstrong 02/01/2025 8 AM 53 Good Valencia and Columbus Square 02/01/2025 8 AM 52 Good Valencia and Legacy 02/01/2025 8 AM 41 Good Victory and Tustin Ranch Rd. 02/01/2025 8 AM ** ** Warner Avenue 02/01/2025 8 AM 33 Good Warner and Armstrong 02/01/2025 8 AM 40 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 2, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/02/2025 8 AM Matter 50 Level of Concern Good Hangar Fenceline - E Side 02/02/2025 8 AM 56 Moderate Hangar Fenceline - N Center 02/02/2025 8 AM ** ** Hangar Fenceline - N Corner 02/02/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/02/2025 8 AM ** ** Hangar Fenceline - NE Side 02/02/2025 8 AM 49 Good Hangar Fenceline - S Corner 02/02/2025 8 AM ** ** Hangar Fenceline - S Side 02/02/2025 8 AM 46 Good Hangar Fenceline - SW Corner 02/02/2025 8 AM ** ** Hangar Fenceline - SW Side 02/02/2025 8 AM 50 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/02/2025 8 AM Particulate Matter 30 Level of Concern Good Legacy Road 02/02/2025 8 AM 41 Good Moffett and Tustin Ranch 02/02/2025 8 AM 44 Good Valencia and Armstrong 02/02/2025 8 AM 51 Good Valencia and Columbus Square 02/02/2025 8 AM 50 Good Valencia and Legacy 02/02/2025 8 AM 44 Good Victory and Tustin Ranch Rd. 02/02/2025 8 AM 48 Good Warner Avenue 02/02/2025 8 AM ** ** Warner and Armstrong 02/02/2025 8 AM 39 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 3, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/03/2025 8 AM Matter 76 Level of Concern Moderate Hangar Fenceline - E Side 02/03/2025 8 AM 92 Moderate Hangar Fenceline - N Center 02/03/2025 8 AM 90 Moderate Hangar Fenceline - N Corner 02/03/2025 8 AM 58 Moderate Hangar Fenceline - NE Corner 02/03/2025 8 AM ** ** Hangar Fenceline - NE Side 02/03/2025 8 AM 76 Moderate Hangar Fenceline - S Corner 02/03/2025 8 AM ** ** Hangar Fenceline - S Side 02/03/2025 8 AM 57 Moderate Hangar Fenceline - SW Corner 02/03/2025 8 AM 102 Moderate Hangar Fenceline - SW Side 02/03/2025 8 AM 77 Moderate • •24-Hour Hangar Fenceline - W Side Period • • 02/03/2025 8 AM Particulate Matter 49 Level of Concern Good Legacy Road 02/03/2025 8 AM 58 Moderate Moffett and Tustin Ranch 02/03/2025 8 AM 62 Moderate Valencia and Armstrong 02/03/2025 8 AM 71 Moderate Valencia and Columbus Square 02/03/2025 8 AM 72 Moderate Valencia and Legacy 02/03/2025 8 AM 50 Good Victory and Tustin Ranch Rd. 02/03/2025 8 AM 65 Moderate Warner Avenue 02/03/2025 8 AM 50 Good Warner and Armstrong 02/03/2025 8 AM 38 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 4, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/04/2025 8 AM Matter 52 Level of Concern Good Hangar Fenceline - E Side 02/04/2025 8 AM 64 Moderate Hangar Fenceline - N Center 02/04/2025 8 AM 58 Moderate Hangar Fenceline - N Corner 02/04/2025 8 AM 44 Good Hangar Fenceline - NE Corner 02/04/2025 8 AM 56 Moderate Hangar Fenceline - NE Side 02/04/2025 8 AM 54 Good Hangar Fenceline - S Corner 02/04/2025 8 AM 52 Good Hangar Fenceline - S Side 02/04/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/04/2025 8 AM 81 Moderate Hangar Fenceline - SW Side 02/04/2025 8 AM 54 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/04/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/04/2025 8 AM 38 Good Moffett and Tustin Ranch 02/04/2025 8 AM ** ** Valencia and Armstrong 02/04/2025 8 AM 53 Good Valencia and Columbus Square 02/04/2025 8 AM 55 Moderate Valencia and Legacy 02/04/2025 8 AM 44 Good Victory and Tustin Ranch Rd. 02/04/2025 8 AM 51 Good Warner Avenue 02/04/2025 8 AM 37 Good Warner and Armstrong 02/04/2025 8 AM 39 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 5, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/05/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 02/05/2025 8 AM 11 Good Hangar Fenceline - N Center 02/05/2025 8 AM 8 Good Hangar Fenceline - N Corner 02/05/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/05/2025 8 AM 9 Good Hangar Fenceline - NE Side 02/05/2025 8 AM 8 Good Hangar Fenceline - S Corner 02/05/2025 8 AM 9 Good Hangar Fenceline - S Side 02/05/2025 8 AM 8 Good Hangar Fenceline - SW Corner 02/05/2025 8 AM 12 Good Hangar Fenceline - SW Side 02/05/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 02/05/2025 8 AM Particulate Matter 5 Level of Concern Good Legacy Road 02/05/2025 8 AM 7 Good Moffett and Tustin Ranch 02/05/2025 8 AM 8 Good Valencia and Armstrong 02/05/2025 8 AM 9 Good Valencia and Columbus Square 02/05/2025 8 AM 7 Good Valencia and Legacy 02/05/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 02/05/2025 8 AM 7 Good Warner Avenue 02/05/2025 8 AM 7 Good Warner and Armstrong 02/05/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 6, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/06/2025 8 AM Matter 11 Level of Concern Good Hangar Fenceline - E Side 02/06/2025 8 AM 14 Good Hangar Fenceline - N Center 02/06/2025 8 AM 10 Good Hangar Fenceline - N Corner 02/06/2025 8 AM 9 Good Hangar Fenceline - NE Corner 02/06/2025 8 AM 12 Good Hangar Fenceline - NE Side 02/06/2025 8 AM 11 Good Hangar Fenceline - S Corner 02/06/2025 8 AM 11 Good Hangar Fenceline - S Side 02/06/2025 8 AM 9 Good Hangar Fenceline - SW Corner 02/06/2025 8 AM 15 Good Hangar Fenceline - SW Side 02/06/2025 8 AM 13 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/06/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/06/2025 8 AM ** ** Moffett and Tustin Ranch 02/06/2025 8 AM 10 Good Valencia and Armstrong 02/06/2025 8 AM 11 Good Valencia and Columbus Square 02/06/2025 8 AM 10 Good Valencia and Legacy 02/06/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 02/06/2025 8 AM 9 Good Warner Avenue 02/06/2025 8 AM 8 Good Warner and Armstrong 02/06/2025 8 AM 8 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 7, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/07/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/07/2025 8 AM 4 Good Hangar Fenceline - N Center 02/07/2025 8 AM 2 Good Hangar Fenceline - N Corner 02/07/2025 8 AM 2 Good Hangar Fenceline - NE Corner 02/07/2025 8 AM 4 Good Hangar Fenceline - NE Side 02/07/2025 8 AM 2 Good Hangar Fenceline - S Corner 02/07/2025 8 AM 2 Good Hangar Fenceline - S Side 02/07/2025 8 AM 2 Good Hangar Fenceline - SW Corner 02/07/2025 8 AM 2 Good Hangar Fenceline - SW Side 02/07/2025 8 AM 3 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/07/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/07/2025 8 AM ** ** Moffett and Tustin Ranch 02/07/2025 8 AM 2 Good Valencia and Armstrong 02/07/2025 8 AM 2 Good Valencia and Columbus Square 02/07/2025 8 AM ** ** Valencia and Legacy 02/07/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/07/2025 8 AM 1 Good Warner Avenue 02/07/2025 8 AM 1 Good Warner and Armstrong 02/07/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 8, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/08/2025 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 02/08/2025 8 AM 12 Good Hangar Fenceline - N Center 02/08/2025 8 AM 6 Good Hangar Fenceline - N Corner 02/08/2025 8 AM 6 Good Hangar Fenceline - NE Corner 02/08/2025 8 AM 7 Good Hangar Fenceline - NE Side 02/08/2025 8 AM 7 Good Hangar Fenceline - S Corner 02/08/2025 8 AM 7 Good Hangar Fenceline - S Side 02/08/2025 8 AM 4 Good Hangar Fenceline - SW Corner 02/08/2025 8 AM 8 Good Hangar Fenceline - SW Side 02/08/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/08/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/08/2025 8 AM 8 Good Moffett and Tustin Ranch 02/08/2025 8 AM 7 Good Valencia and Armstrong 02/08/2025 8 AM 7 Good Valencia and Columbus Square 02/08/2025 8 AM 6 Good Valencia and Legacy 02/08/2025 8 AM 4 Good Victory and Tustin Ranch Rd. 02/08/2025 8 AM 6 Good Warner Avenue 02/08/2025 8 AM 5 Good Warner and Armstrong 02/08/2025 8 AM 4 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 9, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/09/2025 8 AM Matter 19 Level of Concern Good Hangar Fenceline - E Side 02/09/2025 8 AM 25 Good Hangar Fenceline - N Center 02/09/2025 8 AM 18 Good Hangar Fenceline - N Corner 02/09/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/09/2025 8 AM 19 Good Hangar Fenceline - NE Side 02/09/2025 8 AM 18 Good Hangar Fenceline - S Corner 02/09/2025 8 AM 17 Good Hangar Fenceline - S Side 02/09/2025 8 AM 14 Good Hangar Fenceline - SW Corner 02/09/2025 8 AM 24 Good Hangar Fenceline - SW Side 02/09/2025 8 AM 19 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/09/2025 8 AM Particulate Matter 18 Level of Concern Good Legacy Road 02/09/2025 8 AM 23 Good Moffett and Tustin Ranch 02/09/2025 8 AM 17 Good Valencia and Armstrong 02/09/2025 8 AM 19 Good Valencia and Columbus Square 02/09/2025 8 AM 18 Good Valencia and Legacy 02/09/2025 8 AM 14 Good Victory and Tustin Ranch Rd. 02/09/2025 8 AM 17 Good Warner Avenue 02/09/2025 8 AM 14 Good Warner and Armstrong 02/09/2025 8 AM 13 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 10, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/10/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/10/2025 8 AM ** ** Hangar Fenceline - N Center 02/10/2025 8 AM 25 Good Hangar Fenceline - N Corner 02/10/2025 8 AM 22 Good Hangar Fenceline - NE Corner 02/10/2025 8 AM 28 Good Hangar Fenceline - NE Side 02/10/2025 8 AM 26 Good Hangar Fenceline - S Corner 02/10/2025 8 AM 26 Good Hangar Fenceline - S Side 02/10/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/10/2025 8 AM 36 Good Hangar Fenceline - SW Side 02/10/2025 8 AM 28 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/10/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 02/10/2025 8 AM ** ** Moffett and Tustin Ranch 02/10/2025 8 AM 25 Good Valencia and Armstrong 02/10/2025 8 AM 27 Good Valencia and Columbus Square 02/10/2025 8 AM 25 Good Valencia and Legacy 02/10/2025 8 AM 21 Good Victory and Tustin Ranch Rd. 02/10/2025 8 AM 25 Good Warner Avenue 02/10/2025 8 AM 19 Good Warner and Armstrong 02/10/2025 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 11, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/11/2025 8 AM Matter 7 Level of Concern Good Hangar Fenceline - E Side 02/11/2025 8 AM 11 Good Hangar Fenceline - N Center 02/11/2025 8 AM ** ** Hangar Fenceline - N Corner 02/11/2025 8 AM 7 Good Hangar Fenceline - NE Corner 02/11/2025 8 AM ** ** Hangar Fenceline - NE Side 02/11/2025 8 AM 8 Good Hangar Fenceline - S Corner 02/11/2025 8 AM 7 Good Hangar Fenceline - S Side 02/11/2025 8 AM 5 Good Hangar Fenceline - SW Corner 02/11/2025 8 AM ** ** Hangar Fenceline - SW Side 02/11/2025 8 AM 7 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/11/2025 8 AM Particulate Matter 4 Level of Concern Good Legacy Road 02/11/2025 8 AM 9 Good Moffett and Tustin Ranch 02/11/2025 8 AM 8 Good Valencia and Armstrong 02/11/2025 8 AM 9 Good Valencia and Columbus Square 02/11/2025 8 AM ** ** Valencia and Legacy 02/11/2025 8 AM 6 Good Victory and Tustin Ranch Rd. 02/11/2025 8 AM 7 Good Warner Avenue 02/11/2025 8 AM 5 Good Warner and Armstrong 02/11/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 12, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/12/2025 8 AM Matter 9 Level of Concern Good Hangar Fenceline - E Side 02/12/2025 8 AM 13 Good Hangar Fenceline - N Center 02/12/2025 8 AM 7 Good Hangar Fenceline - N Corner 02/12/2025 8 AM 8 Good Hangar Fenceline - NE Corner 02/12/2025 8 AM ** ** Hangar Fenceline - NE Side 02/12/2025 8 AM 9 Good Hangar Fenceline - S Corner 02/12/2025 8 AM 9 Good Hangar Fenceline - S Side 02/12/2025 8 AM 7 Good Hangar Fenceline - SW Corner 02/12/2025 8 AM 11 Good Hangar Fenceline - SW Side 02/12/2025 8 AM 8 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/12/2025 8 AM Particulate Matter 4 Level of Concern Good Legacy Road 02/12/2025 8 AM ** ** Moffett and Tustin Ranch 02/12/2025 8 AM 9 Good Valencia and Armstrong 02/12/2025 8 AM 10 Good Valencia and Columbus Square 02/12/2025 8 AM ** ** Valencia and Legacy 02/12/2025 8 AM 7 Good Victory and Tustin Ranch Rd. 02/12/2025 8 AM 8 Good Warner Avenue 02/12/2025 8 AM ** ** Warner and Armstrong 02/12/2025 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 13, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 02/13/2025 8 AM 2 Good Hangar Fenceline - E Side 02/13/2025 8 AM 4 Good Hangar Fenceline - N Center 02/13/2025 8 AM ** ** Hangar Fenceline - N Corner 02/13/2025 8 AM 1 Good Hangar Fenceline - NE Corner 02/13/2025 8 AM ** ** Hangar Fenceline - NE Side 02/13/2025 8 AM 2 Good Hangar Fenceline - S Corner 02/13/2025 8 AM 1 Good Hangar Fenceline - S Side 02/13/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/13/2025 8 AM 2 Good Hangar Fenceline - SW Side 02/13/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 02/13/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/13/2025 8 AM ** ** Moffett and Tustin Ranch 02/13/2025 8 AM 2 Good Valencia and Armstrong 02/13/2025 8 AM 2 Good Valencia and Columbus Square 02/13/2025 8 AM ** ** Valencia and Legacy 02/13/2025 8 AM 1 Good Victory and Tustin Ranch Rd. 02/13/2025 8 AM ** ** Warner Avenue 02/13/2025 8 AM 1 Good Warner and Armstrong 02/13/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 14, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/14/2025 8 AM Matter 8 Level of Concern Good Hangar Fenceline - E Side 02/14/2025 8 AM 14 Good Hangar Fenceline - N Center 02/14/2025 8 AM 7 Good Hangar Fenceline - N Corner 02/14/2025 8 AM 9 Good Hangar Fenceline - NE Corner 02/14/2025 8 AM 17 Good Hangar Fenceline - NE Side 02/14/2025 8 AM ** ** Hangar Fenceline - S Corner 02/14/2025 8 AM ** ** Hangar Fenceline - S Side 02/14/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/14/2025 8 AM 10 Good Hangar Fenceline - SW Side 02/14/2025 8 AM ** ** • •24-Hour Hangar Fenceline - W Side Period • • 02/14/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/14/2025 8 AM 20 Good Moffett and Tustin Ranch 02/14/2025 8 AM 11 Good Valencia and Armstrong 02/14/2025 8 AM 11 Good Valencia and Columbus Square 02/14/2025 8 AM 9 Good Valencia and Legacy 02/14/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/14/2025 8 AM 8 Good Warner Avenue 02/14/2025 8 AM 7 Good Warner and Armstrong 02/14/2025 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 15, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/15/2025 8 AM Matter 16 Level of Concern Good Hangar Fenceline - E Side 02/15/2025 8 AM 17 Good Hangar Fenceline - N Center 02/15/2025 8 AM 9 Good Hangar Fenceline - N Corner 02/15/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/15/2025 8 AM 16 Good Hangar Fenceline - NE Side 02/15/2025 8 AM 13 Good Hangar Fenceline - S Corner 02/15/2025 8 AM 5 Good Hangar Fenceline - S Side 02/15/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/15/2025 8 AM 14 Good Hangar Fenceline - SW Side 02/15/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/15/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/15/2025 8 AM ** ** Moffett and Tustin Ranch 02/15/2025 8 AM 16 Good Valencia and Armstrong 02/15/2025 8 AM 14 Good Valencia and Columbus Square 02/15/2025 8 AM 12 Good Valencia and Legacy 02/15/2025 8 AM 8 Good Victory and Tustin Ranch Rd. 02/15/2025 8 AM 10 Good Warner Avenue 02/15/2025 8 AM ** ** Warner and Armstrong 02/15/2025 8 AM 9 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 16, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/16/2025 8 AM Matter 15 Level of Concern Good Hangar Fenceline - E Side 02/16/2025 8 AM 16 Good Hangar Fenceline - N Center 02/16/2025 8 AM 9 Good Hangar Fenceline - N Corner 02/16/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/16/2025 8 AM 10 Good Hangar Fenceline - NE Side 02/16/2025 8 AM ** ** Hangar Fenceline - S Corner 02/16/2025 8 AM ** ** Hangar Fenceline - S Side 02/16/2025 8 AM 11 Good Hangar Fenceline - SW Corner 02/16/2025 8 AM 16 Good Hangar Fenceline - SW Side 7 02/16/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/16/2025 8 AM Particulate Matter 6 Level of Concern Good Legacy Road 02/16/2025 8 AM ** ** Moffett and Tustin Ranch 02/16/2025 8 AM 18 Good Valencia and Armstrong 02/16/2025 8 AM 13 Good Valencia and Columbus Square 02/16/2025 8 AM 11 Good Valencia and Legacy 02/16/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 02/16/2025 8 AM ** ** Warner Avenue 02/16/2025 8 AM 7 Good Warner and Armstrong 02/16/2025 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 17, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/17/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/17/2025 8 AM 20 Good Hangar Fenceline - N Center 02/17/2025 8 AM ** ** Hangar Fenceline - N Corner 02/17/2025 8 AM 14 Good Hangar Fenceline - NE Corner 02/17/2025 8 AM 18 Good Hangar Fenceline - NE Side 02/17/2025 8 AM 16 Good Hangar Fenceline - S Corner 02/17/2025 8 AM 14 Good Hangar Fenceline - S Side 02/17/2025 8 AM 15 Good Hangar Fenceline - SW Corner 02/17/2025 8 AM 21 Good Hangar Fenceline - SW Side 02/17/2025 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/17/2025 8 AM Particulate Matter 14 Level of Concern Good Legacy Road 02/17/2025 8 AM ** ** Moffett and Tustin Ranch 02/17/2025 8 AM 22 Good Valencia and Armstrong 02/17/2025 8 AM ** ** Valencia and Columbus Square 02/17/2025 8 AM 15 Good Valencia and Legacy 02/17/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 02/17/2025 8 AM 14 Good Warner Avenue 02/17/2025 8 AM 9 Good Warner and Armstrong 02/17/2025 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 18, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/18/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/18/2025 8 AM 16 Good Hangar Fenceline - N Center 02/18/2025 8 AM 11 Good Hangar Fenceline - N Corner 02/18/2025 8 AM 11 Good Hangar Fenceline - NE Corner 02/18/2025 8 AM 16 Good Hangar Fenceline - NE Side 02/18/2025 8 AM 13 Good Hangar Fenceline - S Corner 02/18/2025 8 AM 11 Good Hangar Fenceline - S Side 02/18/2025 8 AM 11 Good Hangar Fenceline - SW Corner 02/18/2025 8 AM 17 Good Hangar Fenceline - SW Side 02/18/2025 8 AM 12 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/18/2025 8 AM Particulate Matter 15 Level of Concern Good Legacy Road 02/18/2025 8 AM ** ** Moffett and Tustin Ranch 02/18/2025 8 AM 20 Good Valencia and Armstrong 02/18/2025 8 AM ** ** Valencia and Columbus Square 02/18/2025 8 AM ** ** Valencia and Legacy 02/18/2025 8 AM 9 Good Victory and Tustin Ranch Rd. 02/18/2025 8 AM 10 Good Warner Avenue 02/18/2025 8 AM 9 Good Warner and Armstrong 02/18/2025 8 AM 10 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 19, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. Very Unhealthy Hazardous (355 to 424) (425-504) Columbus Square Park PeriodLocation 24-Hour Ending 02/19/2025 8 AM Particulate Matter 27 Level of Concern Good Hangar Fenceline - E Side 02/19/2025 8 AM 27 Good Hangar Fenceline - N Center 02/19/2025 8 AM 22 Good Hangar Fenceline - N Corner 02/19/2025 8 AM 17 Good Hangar Fenceline - NE Corner 02/19/2025 8 AM 25 Good Hangar Fenceline - NE Side 02/19/2025 8 AM 22 Good Hangar Fenceline - S Corner 02/19/2025 8 AM 19 Good Hangar Fenceline - S Side 02/19/2025 8 AM 19 Good Hangar Fenceline - SW Corner 02/19/2025 8 AM 28 Good Hangar Fenceline - SW Side 02/19/2025 8 AM 21 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/19/2025 8 AM Particulate Matter 23 Level of Concern Good Legacy Road 02/19/2025 8 AM 27 Good Moffett and Tustin Ranch 02/19/2025 8 AM 29 Good Valencia and Armstrong 02/19/2025 8 AM 10 Good Valencia and Columbus Square 02/19/2025 8 AM 21 Good Valencia and Legacy 02/19/2025 8 AM 16 Good Victory and Tustin Ranch Rd. 02/19/2025 8 AM 18 Good Warner Avenue 02/19/2025 8 AM 16 Good Warner and Armstrong 02/19/2025 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 20, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/20/2025 8 AM Matter 38 Level of Concern Good Hangar Fenceline - E Side 02/20/2025 8 AM 39 Good Hangar Fenceline - N Center 02/20/2025 8 AM 31 Good Hangar Fenceline - N Corner 02/20/2025 8 AM 26 Good Hangar Fenceline - NE Corner 02/20/2025 8 AM ** ** Hangar Fenceline - NE Side 02/20/2025 8 AM 31 Good Hangar Fenceline - S Corner 02/20/2025 8 AM ** ** Hangar Fenceline - S Side 02/20/2025 8 AM 29 Good Hangar Fenceline - SW Corner 02/20/2025 8 AM ** ** Hangar Fenceline - SW Side 02/20/2025 8 AM 32 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/20/2025 8 AM Particulate Matter 31 Level of Concern Good Legacy Road 02/20/2025 8 AM 33 Good Moffett and Tustin Ranch 02/20/2025 8 AM 40 Good Valencia and Armstrong 02/20/2025 8 AM 14 Good Valencia and Columbus Square 02/20/2025 8 AM 31 Good Valencia and Legacy 02/20/2025 8 AM 23 Good Victory and Tustin Ranch Rd. 02/20/2025 8 AM 28 Good Warner Avenue 02/20/2025 8 AM ** ** Warner and Armstrong 02/20/2025 8 AM 26 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 21, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/21/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/21/2025 8 AM 47 Good Hangar Fenceline - N Center 02/21/2025 8 AM 41 Good Hangar Fenceline - N Corner 02/21/2025 8 AM 32 Good Hangar Fenceline - NE Corner 02/21/2025 8 AM 45 Good Hangar Fenceline - NE Side 02/21/2025 8 AM 40 Good Hangar Fenceline - S Corner 02/21/2025 8 AM ** ** Hangar Fenceline - S Side 02/21/2025 8 AM 36 Good Hangar Fenceline - SW Corner 02/21/2025 8 AM 55 Moderate Hangar Fenceline - SW Side 02/21/2025 8 AM 41 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/21/2025 8 AM Particulate Matter 36 Level of Concern Good Legacy Road 02/21/2025 8 AM ** ** Moffett and Tustin Ranch 02/21/2025 8 AM 46 Good Valencia and Armstrong 02/21/2025 8 AM ** ** Valencia and Columbus Square 02/21/2025 8 AM 40 Good Valencia and Legacy 02/21/2025 8 AM 30 Good Victory and Tustin Ranch Rd. 02/21/2025 8 AM 34 Good Warner Avenue 02/21/2025 8 AM ** ** Warner and Armstrong 02/21/2025 8 AM 32 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Saturday, February 22, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/22/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/22/2025 8 AM 46 Good Hangar Fenceline - N Center 02/22/2025 8 AM 37 Good Hangar Fenceline - N Corner 02/22/2025 8 AM 30 Good Hangar Fenceline - NE Corner 02/22/2025 8 AM 44 Good Hangar Fenceline - NE Side 02/22/2025 8 AM 39 Good Hangar Fenceline - S Corner 02/22/2025 8 AM ** ** Hangar Fenceline - S Side 02/22/2025 8 AM ** ** Hangar Fenceline - SW Corner 02/22/2025 8 AM 53 Good Hangar Fenceline - SW Side 02/22/2025 8 AM 40 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/22/2025 8 AM Particulate Matter 36 Level of Concern Good Legacy Road 02/22/2025 8 AM ** ** Moffett and Tustin Ranch 02/22/2025 8 AM 45 Good Valencia and Armstrong 02/22/2025 8 AM 17 Good Valencia and Columbus Square 02/22/2025 8 AM 38 Good Valencia and Legacy 02/22/2025 8 AM 27 Good Victory and Tustin Ranch Rd. 02/22/2025 8 AM 32 Good Warner Avenue 02/22/2025 8 AM ** ** Warner and Armstrong 02/22/2025 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Sunday, February 23, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups 155 to 254) (255 to 354) (355 to 424) (425-504) �( See below for further category descriptions. ** Data gap due to instrument malfunction Location Columbus Square Park 24-Hour Period Ending 02/23/2025 8 AM ** ** Hangar Fenceline - E Side 02/23/2025 8 AM 33 Good Hangar Fenceline - N Center 02/23/2025 8 AM 27 Good Hangar Fenceline - N Corner 02/23/2025 8 AM 22 Good Hangar Fenceline - NE Corner 02/23/2025 8 AM 30 Good Hangar Fenceline - NE Side 02/23/2025 8 AM 26 Good Hangar Fenceline - S Corner 02/23/2025 8 AM ** ** Hangar Fenceline - S Side 02/23/2025 8 AM 29 Good Hangar Fenceline - SW Corner 02/23/2025 8 AM 43 Good Hangar Fenceline - SW Side 02/23/2025 8 AM 27 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/23/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/23/2025 8 AM 35 Good Moffett and Tustin Ranch 02/23/2025 8 AM 34 Good Valencia and Armstrong 02/23/2025 8 AM 12 Good Valencia and Columbus Square 02/23/2025 8 AM 26 Good Valencia and Legacy 02/23/2025 8 AM 20 Good Victory and Tustin Ranch Rd. 02/23/2025 8 AM ** ** Warner Avenue 02/23/2025 8 AM ** ** Warner and Armstrong 02/23/2025 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Monday, February 24, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/24/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/24/2025 8 AM ** ** Hangar Fenceline - N Center 02/24/2025 8 AM 17 Good Hangar Fenceline - N Corner 02/24/2025 8 AM ** ** Hangar Fenceline - NE Corner 02/24/2025 8 AM ** ** Hangar Fenceline - NE Side 02/24/2025 8 AM 18 Good Hangar Fenceline - S Corner 02/24/2025 8 AM ** ** Hangar Fenceline - S Side 02/24/2025 8 AM 20 Good Hangar Fenceline - SW Corner 02/24/2025 8 AM 29 Good Hangar Fenceline - SW Side 02/24/2025 8 AM 16 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/24/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/24/2025 8 AM 25 Good Moffett and Tustin Ranch 02/24/2025 8 AM 26 Good Valencia and Armstrong 02/24/2025 8 AM 10 Good Valencia and Columbus Square 02/24/2025 8 AM 17 Good Valencia and Legacy 02/24/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/24/2025 8 AM 15 Good Warner Avenue 02/24/2025 8 AM ** ** Warner and Armstrong 02/24/2025 8 AM ** ** Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Tuesday, February 25, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/25/2025 8 AM Matter ** Level of Concern ** Hangar Fenceline - E Side 02/25/2025 8 AM ** ** Hangar Fenceline - N Center 02/25/2025 8 AM 26 Good Hangar Fenceline - N Corner 02/25/2025 8 AM 24 Good Hangar Fenceline - NE Corner 02/25/2025 8 AM 29 Good Hangar Fenceline - NE Side 02/25/2025 8 AM 28 Good Hangar Fenceline - S Corner 02/25/2025 8 AM ** ** Hangar Fenceline - S Side 02/25/2025 8 AM 26 Good Hangar Fenceline - SW Corner 02/25/2025 8 AM 40 Good Hangar Fenceline - SW Side 02/25/2025 8 AM 24 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/25/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/25/2025 8 AM 36 Good Moffett and Tustin Ranch 02/25/2025 8 AM 34 Good Valencia and Armstrong 02/25/2025 8 AM ** ** Valencia and Columbus Square 02/25/2025 8 AM 26 Good Valencia and Legacy 02/25/2025 8 AM ** ** Victory and Tustin Ranch Rd. 02/25/2025 8 AM 22 Good Warner Avenue 02/25/2025 8 AM ** ** Warner and Armstrong 02/25/2025 8 AM 21 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Wednesday, February 26, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/26/2025 8 AM Matter 41 Level of Concern Good Hangar Fenceline - E Side 02/26/2025 8 AM 46 Good Hangar Fenceline - N Center 02/26/2025 8 AM 37 Good Hangar Fenceline - N Corner 02/26/2025 8 AM 31 Good Hangar Fenceline - NE Corner 02/26/2025 8 AM 41 Good Hangar Fenceline - NE Side 02/26/2025 8 AM 42 Good Hangar Fenceline - S Corner 02/26/2025 8 AM 47 Good Hangar Fenceline - S Side 02/26/2025 8 AM 32 Good Hangar Fenceline - SW Corner 02/26/2025 8 AM 50 Good Hangar Fenceline - SW Side 02/26/2025 8 AM 38 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/26/2025 8 AM Particulate Matter 28 Level of Concern Good Legacy Road 02/26/2025 8 AM 50 Good Moffett and Tustin Ranch 02/26/2025 8 AM ** ** Valencia and Armstrong 02/26/2025 8 AM 13 Good Valencia and Columbus Square 02/26/2025 8 AM 39 Good Valencia and Legacy 02/26/2025 8 AM 24 Good Victory and Tustin Ranch Rd. 02/26/2025 8 AM 29 Good Warner Avenue 02/26/2025 8 AM ** ** Warner and Armstrong 02/26/2025 8 AM 22 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Thursday, February 27, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/27/2025 8 AM Matter 46 Level of Concern Good Hangar Fenceline - E Side 02/27/2025 8 AM 52 Good Hangar Fenceline - N Center 02/27/2025 8 AM 4S Good Hangar Fenceline - N Corner 02/27/202S 8 AM 35 Good Hangar Fenceline - NE Corner 02/27/202S 8 AM 45 Good Hangar Fenceline - NE Side 02/27/2025 8 AM 46 Good Hangar Fenceline - S Corner 02/27/2025 8 AM 51 Good Hangar Fenceline - S Side 02/27/2025 8 AM 38 Good Hangar Fenceline - SW Corner 02/27/2025 8 AM 58 Moderate Hangar Fenceline - SW Side 02/27/2025 8 AM 41 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/27/2025 8 AM Particulate Matter 32 Level of Concern Good Legacy Road 02/27/2025 8 AM 51 Good Moffett and Tustin Ranch 02/27/2025 8 AM 46 Good Valencia and Armstrong 02/27/2025 8 AM 16 Good Valencia and Columbus Square 02/27/2025 8 AM 45 Good Valencia and Legacy 02/27/2025 8 AM 30 Good Victory and Tustin Ranch Rd. 02/27/2025 8 AM 33 Good Warner Avenue 02/27/2025 8 AM ** ** Warner and Armstrong 02/27/2025 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected. Friday, February 28, 2025 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals An environmental group contracted by the U.S. Navy is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthyfor Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to instrument malfunction Very Unhealthy Hazardous (355 to 424) (425-504) Location Columbus Square Park Period Ending 02/28/2025 8 AM Matter 20 Level of Concern Good Hangar Fenceline - E Side 02/28/2025 8 AM 21 Good Hangar Fenceline - N Center 02/28/2025 8 AM ** ** Hangar Fenceline - N Corner 02/28/2025 8 AM 16 Good Hangar Fenceline - NE Corner 02/28/2025 8 AM 20 Good Hangar Fenceline - NE Side 02/28/2025 8 AM 17 Good Hangar Fenceline - S Corner 02/28/2025 8 AM 23 Good Hangar Fenceline - S Side 02/28/2025 8 AM 21 Good Hangar Fenceline - SW Corner 02/28/2025 8 AM 25 Good Hangar Fenceline - SW Side 02/28/2025 8 AM 14 Good • •24-Hour Hangar Fenceline - W Side Period • • 02/28/2025 8 AM Particulate Matter ** Level of Concern ** Legacy Road 02/28/2025 8 AM 25 Good Moffett and Tustin Ranch 02/28/2025 8 AM 27 Good Valencia and Armstrong 02/28/2025 8 AM 8 Good Valencia and Columbus Square 02/28/2025 8 AM 16 Good Valencia and Legacy 02/28/2025 8 AM 12 Good Victory and Tustin Ranch Rd. 02/28/2025 8 AM 17 Good Warner Avenue 02/28/2025 8 AM 11 Good Warner and Armstrong 02/28/2025 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 to 504 Health warning of emergency - conditions: ever. . likely ..- affected.