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HomeMy WebLinkAboutAir PM Results December 2023Friday, December 1, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. r Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) Wj Unhealthy Very Unhealthy (255 to 354) (355 to 424) * See below for further category descriptions. ** Data gap due to instrument malfunction, instrument recalibrated Century High School PeriodLocation 24-Hour Ending 12/1/2023 8 AM Particulate Matter 14 Level of Concern Good Columbus Square Park 12/1/2023 8 AM 6 Good Fire Station 21 12/1/2023 8 AM 10 Good Fire Station 28 12/1/2023 8 AM 15 Good Fire Station 37** 12/1/2023 8 AM 6 Good Fire Station 6 12/1/2023 8 AM 14 Good Hangar Fenceline - E Side 12/1/2023 8 AM 9 Good Hangar Fenceline - N Center 12/1/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/1/2023 8 AM 9 Good Hangar Fenceline - NE Corner 12/1/2023 8 AM 9 Good Hangar Fenceline - NE Side 12/1/2023 8 AM 8 Good Hangar Fenceline - S Corner 12/1/2023 8 AM 8 Good Hangar Fenceline - S Side 12/1/2023 8 AM 4 Good Hangar Fenceline - SW Corner 12/1/2023 8 AM 8 Good Hangar Fenceline - SW Side 12/1/2023 8 AM 10 Good Hangar Fenceline - W Side 12/1/2023 8 AM 8 Good Heritage Elementary 12/1/2023 8 AM 8 Good Legacy Academy** 12/1/2023 8 AM 7 Good Legacy Road 12/1/2023 8 AM 10 Good Moffett and Tustin Ranch** 12/1/2023 8 AM 9 Good OC Animal Shelter 12/1/2023 8 AM 5 Good OCHCA 12/1/2023 8 AM 3 Good The District (Costco) 12/1/2023 8 AM 5 Good Tustin Field Services 12/1/2023 8 AM 5 Good Tustin High School 12/1/2023 8 AM 2 Good Tustin Legacy Park 12/1/2023 8 AM 7 Good Valencia and Armstrong 12/1/2023 8 AM 5 Good Valencia and Columbus Square 12/1/2023 8 AM 6 Good Valencia and Legacy 12/1/2023 8 AM 9 Good Victory and Tustin Ranch Rd. 12/1/2023 8 AM 9 Good Warner and Armstrong 12/1/2023 8 AM 3 Good Warner Avenue 12/1/2023 8 AM 9 Good WR Nelson Elementary 12/1/2023 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425-504 Health warning of emer, conditions: ever• ore likely to be affected. Saturday, December 2, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) * See below for further category descriptions. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/2/2023 8 AM Particulate 15 Good Columbus Square Park 12/2/2023 8 AM 10 Good Fire Station 21 12/2/2023 8 AM 11 Good Fire Station 28 12/2/2023 8 AM 19 Good Fire Station 37 12/2/2023 8 AM 14 Good Fire Station 6 12/2/2023 8 AM 17 Good Hangar Fenceline - E Side 12/2/2023 8 AM 11 Good Hangar Fenceline - N Center 12/2/2023 8 AM 13 Good Hangar Fenceline - N Corner 12/2/2023 8 AM 14 Good Hangar Fenceline - NE Corner 12/2/2023 8 AM 15 Good Hangar Fenceline - NE Side 12/2/2023 8 AM 13 Good Hangar Fenceline - S Corner 12/2/2023 8 AM 15 Good Hangar Fenceline - S Side 12/2/2023 8 AM 3 Good Hangar Fenceline - SW Corner 12/2/2023 8 AM 16 Good Hangar Fenceline - SW Side 12/2/2023 8 AM 18 Good Hangar Fenceline - W Side 12/2/2023 8 AM 14 Good Heritage Elementary 12/2/2023 8 AM 13 Good Legacy Academy 12/2/2023 8 AM 17 Good Legacy Road 12/2/2023 8 AM 18 Good Moffett and Tustin Ranch 12/2/2023 8 AM 15 Good OC Animal Shelter 12/2/2023 8 AM 16 Good OCHCA 12/2/2023 8 AM 5 Good The District (Costco) 12/2/2023 8 AM 7 Good Tustin Field Services 12/2/2023 8 AM 6 Good Tustin High School 12/2/2023 8 AM 4 Good Tustin Legacy Park 12/2/2023 8 AM 7 Good Valencia and Armstrong 12/2/2023 8 AM 10 Good Valencia and Columbus Square 12/2/2023 8 AM 12 Good Valencia and Legacy 12/2/2023 8 AM 16 Good Victory and Tustin Ranch Rd. 12/2/2023 8 AM 17 Good Warner and Armstrong 12/2/2023 8 AM 9 Good Warner Avenue 12/2/2023 8 AM 10 Good WR Nelson Elementary 12/2/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Sunday, December 3, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 See below for further category descriptions. Instrument malfunction, instrument enclosure replaced. *" Instrument malfunction, additional maintenance and recalibration performed. Location Century High School 24-Hour Period Ending 12/3/2023 8 AM Matter • 37 Level of • Good Columbus Square Park 12/3/2023 8 AM 9 Good Fire Station 21 12/3/2023 8 AM 29 Good Fire Station 28 12/3/2023 8 AM 35 Good Fire Station 37 12/3/2023 8 AM 11 Good Fire Station 6 12/3/2023 8 AM 33 Good Hangar Fenceline - E Side 12/3/2023 8 AM 12 Good Hangar Fenceline - N Center 12/3/2023 8 AM 15 Good Hangar Fenceline - N Corner 12/3/2023 8 AM 16 Good Hangar Fenceline - NE Corner 12/3/2023 8 AM 15 Good Hangar Fenceline - NE Side 12/3/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/3/2023 8 AM 18 Good Hangar Fenceline - S Side 12/3/2023 8 AM ** ** Hangar Fenceline - SW Corner 12/3/2023 8 AM 18 Good Hangar Fenceline - SW Side 12/3/2023 8 AM 15 Good Hangar Fenceline - W Side 12/3/2023 8 AM 13 Good Heritage Elementary 12/3/2023 8 AM *** *** Legacy Academy 12/3/2023 8 AM 17 Good Legacy Road 12/3/2023 8 AM 16 Good Moffett and Tustin Ranch 12/3/2023 8 AM 16 Good OC Animal Shelter 12/3/2023 8 AM 17 Good OCHCA 12/3/2023 8 AM 6 Good The District (Costco) 12/3/2023 8 AM 6 Good Tustin Field Services 12/3/2023 8 AM 9 Good Tustin High School 12/3/2023 8 AM 3 Good Tustin Legacy Park 12/3/2023 8 AM 6 Good Valencia and Armstrong 12/3/2023 8 AM 11 Good Valencia and Columbus Square 12/3/2023 8 AM 9 Good Valencia and Legacy 12/3/2023 8 AM 14 Good Victory and Tustin Ranch Rd. 12/3/2023 8 AM 17 Good Warner and Armstrong 12/3/2023 8 AM 8 Good Warner Avenue 12/3/2023 8 AM 9 Good WR Nelson Elementary 12/3/2023 8 AM 25 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. LurpleVery Sunday, December 4, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 See below for further category descriptions. Instrument malfunction, instrument enclosure replaced. *" Instrument malfunction, additional maintenance and recalibration performed. Location Century High School 24-Hour Period Ending 12/4/2023 8 AM Matter • 65 Level of • Moderate Columbus Square Park 12/4/2023 8 AM 20 Good Fire Station 21 12/4/2023 8 AM 51 Good Fire Station 28 12/4/2023 8 AM 86 Moderate Fire Station 37 12/4/2023 8 AM 22 Good Fire Station 6 12/4/2023 8 AM 67 Moderate Hangar Fenceline - E Side 12/4/2023 8 AM 24 Good Hangar Fenceline - N Center 12/4/2023 8 AM 31 Good Hangar Fenceline - N Corner 12/4/2023 8 AM 30 Good Hangar Fenceline - NE Corner 12/4/2023 8 AM 30 Good Hangar Fenceline - NE Side 12/4/2023 8 AM 26 Good Hangar Fenceline - S Corner 12/4/2023 8 AM 33 Good Hangar Fenceline - S Side 12/4/2023 8 AM 31 Good Hangar Fenceline - SW Corner 12/4/2023 8 AM 38 Good Hangar Fenceline - SW Side 12/4/2023 8 AM 35 Good Hangar Fenceline - W Side 12/4/2023 8 AM 29 Good Heritage Elementary 12/4/2023 8 AM 28 Good Legacy Academy 12/4/2023 8 AM 33 Good Legacy Road 12/4/2023 8 AM 32 Good Moffett and Tustin Ranch 12/4/2023 8 AM 33 Good OC Animal Shelter 12/4/2023 8 AM 31 Good OCHCA 12/4/2023 8 AM 19 Good The District (Costco) 12/4/2023 8 AM 22 Good Tustin Field Services 12/4/2023 8 AM 1 Good Tustin High School 12/4/2023 8 AM 11 Good Tustin Legacy Park 12/4/2023 8 AM 1 Good Valencia and Armstrong 12/4/2023 8 AM 25 Good Valencia and Columbus Square 12/4/2023 8 AM 18 Good Valencia and Legacy 12/4/2023 8 AM 29 Good Victory and Tustin Ranch Rd. 12/4/2023 8 AM 33 Good Warner and Armstrong 12/4/2023 8 AM 19 Good Warner Avenue 12/4/2023 8 AM 23 Good WR Nelson Elementary 12/4/2023 8 AM 51 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. LurpleVery Tuesday, December 5, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) * See below for further category descriptions. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/5/2023 8 AM Particulate 21 Good Columbus Square Park 12/5/2023 8 AM 31 Good Fire Station 21 12/5/2023 8 AM 15 Good Fire Station 28 12/5/2023 8 AM 23 Good Fire Station 37 12/5/2023 8 AM 35 Good Fire Station 6 12/5/2023 8 AM 22 Good Hangar Fenceline - E Side 12/5/2023 8 AM 38 Good Hangar Fenceline - N Center 12/5/2023 8 AM 42 Good Hangar Fenceline - N Corner 12/5/2023 8 AM 45 Good Hangar Fenceline - NE Corner 12/5/2023 8 AM 46 Good Hangar Fenceline - NE Side 12/5/2023 8 AM 42 Good Hangar Fenceline - S Corner 12/5/2023 8 AM 50 Good Hangar Fenceline - S Side 12/5/2023 8 AM 45 Good Hangar Fenceline - SW Corner 12/5/2023 8 AM 53 Good Hangar Fenceline - SW Side 12/5/2023 8 AM 52 Good Hangar Fenceline - W Side 12/5/2023 8 AM 43 Good Heritage Elementary 12/5/2023 8 AM 42 Good Legacy Academy 12/5/2023 8 AM 53 Good Legacy Road 12/5/2023 8 AM 54 Good Moffett and Tustin Ranch 12/5/2023 8 AM 57 Moderate OC Animal Shelter 12/5/2023 8 AM 50 Good OCHCA 12/5/2023 8 AM 6 Good The District (Costco) 12/5/2023 8 AM 8 Good Tustin Field Services 12/5/2023 8 AM 6 Good Tustin High School 12/5/2023 8 AM 5 Good Tustin Legacy Park 12/5/2023 8 AM 24 Good Valencia and Armstrong 12/5/2023 8 AM 38 Good Valencia and Columbus Square 12/5/2023 8 AM 27 Good Valencia and Legacy 12/5/2023 8 AM 45 Good Victory and Tustin Ranch Rd. 12/5/2023 8 AM 55 Moderate Warner and Armstrong 12/5/2023 8 AM 29 Good Warner Avenue 12/5/2023 8 AM 39 Good WR Nelson Elementary 12/5/2023 8 AM 17 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Wednesday, December 6, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) See below for further category descriptions. ** Data gap due to power failure, instrument replaced. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/6/2023 8 AM Particulate Matter • 29 Level of Concern Good Columbus Square Park 12/6/2023 8 AM 18 Good Fire Station 21 12/6/2023 8 AM 23 Good Fire Station 28 12/6/2023 8 AM 32 Good Fire Station 37 12/6/2023 8 AM 20 Good Fire Station 6 12/6/2023 8 AM 31 Good Hangar Fenceline - E Side 12/6/2023 8 AM 21 Good Hangar Fenceline - N Center 12/6/2023 8 AM 24 Good Hangar Fenceline - N Corner 12/6/2023 8 AM 25 Good Hangar Fenceline - NE Corner 12/6/2023 8 AM 19 Good Hangar Fenceline - NE Side 12/6/2023 8 AM 22 Good Hangar Fenceline - S Corner 12/6/2023 8 AM 29 Good Hangar Fenceline - S Side 12/6/2023 8 AM 37 Good Hangar Fenceline - SW Corner 12/6/2023 8 AM 32 Good Hangar Fenceline - SW Side 12/6/2023 8 AM 27 Good Hangar Fenceline - W Side 12/6/2023 8 AM 26 Good Heritage Elementary 12/6/2023 8 AM 22 Good Legacy Academy 12/6/2023 8 AM 28 Good Legacy Road 12/6/2023 8 AM 29 Good Moffett and Tustin Ranch 12/6/2023 8 AM 28 Good OC Animal Shelter 12/6/2023 8 AM ** ** OCHCA 12/6/2023 8 AM 9 Good The District (Costco) 12/6/2023 8 AM 14 Good Tustin Field Services 12/6/2023 8 AM 8 Good Tustin High School 12/6/2023 8 AM 4 Good Tustin Legacy Park 12/6/2023 8 AM 15 Good Valencia and Armstrong 12/6/2023 8 AM 19 Good Valencia and Columbus Square 12/6/2023 8 AM 14 Good Valencia and Legacy 12/6/2023 8 AM 24 Good Victory and Tustin Ranch Rd. 12/6/2023 8 AM 40 Good Warner and Armstrong 12/6/2023 8 AM 12 Good Warner Avenue 12/6/2023 8 AM 21 Good WR Nelson Elementary 12/6/2023 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. L Thursday, December 7, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for (0 to 54) (55 to 154) Sensitive Groups (155 to 254) * See below for further category descriptions. Unhealthy Very UnhealtHazardous (255 to 354) (355 to 424 Century High School PeriodLocation 24-Hour Ending 12/7/2023 8 AM Particulate 38 Good Columbus Square Park 12/7/2023 8 AM 16 Good Fire Station 21 12/7/2023 8 AM 33 Good Fire Station 28 12/7/2023 8 AM 39 Good Fire Station 37 12/7/2023 8 AM 20 Good Fire Station 6 12/7/2023 8 AM 39 Good Hangar Fenceline - E Side 12/7/2023 8 AM 21 Good Hangar Fenceline - N Center 12/7/2023 8 AM 25 Good Hangar Fenceline - N Corner 12/7/2023 8 AM 25 Good Hangar Fenceline - NE Corner 12/7/2023 8 AM 25 Good Hangar Fenceline - NE Side 12/7/2023 8 AM 22 Good Hangar Fenceline - S Corner 12/7/2023 8 AM 26 Good Hangar Fenceline - S Side 12/7/2023 8 AM 29 Good Hangar Fenceline - SW Corner 12/7/2023 8 AM 28 Good Hangar Fenceline - SW Side 12/7/2023 8 AM 26 Good Hangar Fenceline - W Side 12/7/2023 8 AM 24 Good Heritage Elementary 12/7/2023 8 AM 23 Good Legacy Academy 12/7/2023 8 AM 31 Good Legacy Road 12/7/2023 8 AM 28 Good Moffett and Tustin Ranch 12/7/2023 8 AM 31 Good OC Animal Shelter 12/7/2023 8 AM 26 Good OCHCA 12/7/2023 8 AM 9 Good The District (Costco) 12/7/2023 8 AM 12 Good Tustin Field Services 12/7/2023 8 AM 7 Good Tustin High School 12/7/2023 8 AM 7 Good Tustin Legacy Park 12/7/2023 8 AM 13 Good Valencia and Armstrong 12/7/2023 8 AM 21 Good Valencia and Columbus Square 12/7/2023 8 AM 13 Good Valencia and Legacy 12/7/2023 8 AM 25 Good Victory and Tustin Ranch Rd. 12/7/2023 8 AM 32 Good Warner and Armstrong 12/7/2023 8 AM 11 Good Warner Avenue 12/7/2023 8 AM 21 Good WR Nelson Elementary 12/7/2023 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Friday, December 8, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air sampling measurement sites have been set up around the perimeter of the hangar and in surrounding communities to provide information on pollutants in the air. While the sampling units are in place, air quality results will be provided for the public reference. Any questions regarding these numbers should be directed to the call center at (714)-426-2444. What is being measured in the air? A variety of pollutants are being measured continuously such as particulate matter (PM), Volatile Organic Compounds (VOCs — a common contaminant), carbon monoxide, and sulfur dioxide. Pollutants collected and analyzed in a laboratory include asbestos and the following metals: Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc Incident air quality reports will include the results of the primary pollutants of concern including PM, asbestos, lead and arsenic and if other pollutants are exceeding a health -based threshold, they will be identified. Please note, that the pollutants selected are specific to this localized incident and thus may have differences of "air quality" compared to general regional air quality reporting (weather channel, IOS/Android weather information). What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. For information about air quality index (AQI) and regional air quality monitoring, visit the AirNow website at www.airnow.gov. What is Asbestos? Asbestos is a natural occurring mineral that can be found in nature. It is even found inside California's State rock, Serpentine. It was commonly used in many different building materials and products over the years. If asbestos fibers are released into the air, they pose a health risk when inhaled. What are Toxic Metals in air? Certain metals are hazardous air pollutants, also known as toxic air pollutants or air toxics. These air toxics are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects at sufficient concentrations and durations. Good Moderate Unhealthy for Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument recalibrated. Very Unhealthy (355 to 424) Location Century High School 24-Hour Period Ending 12/8/2023 8 AM Matter • 21 Level of • Good Columbus Square Park 12/8/2023 8 AM 11 Good Fire Station 21 12/8/2023 8 AM 17 Good Fire Station 28 12/8/2023 8 AM 22 Good Fire Station 37 12/8/2023 8 AM 12 Good Fire Station 6 12/8/2023 8 AM 22 Good Hangar Fenceline - E Side 12/8/2023 8 AM 12 Good Hangar Fenceline - N Center 12/8/2023 8 AM 13 Good Hangar Fenceline - N Corner 12/8/2023 8 AM 15 Good Hangar Fenceline - NE Corner 12/8/2023 8 AM 16 Good Hangar Fenceline - NE Side 12/8/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/8/2023 8 AM 16 Good Hangar Fenceline - S Side 12/8/2023 8 AM 17 Good Hangar Fenceline - SW Corner 12/8/2023 8 AM 19 Good Hangar Fenceline - SW Side 12/8/2023 8 AM 16 Good Hangar Fenceline - W Side 12/8/2023 8 AM 13 Good Heritage Elementary 12/8/2023 8 AM 14 Good Legacy Academy 12/8/2023 8 AM 18 Good Legacy Road 12/8/2023 8 AM 17 Good Moffett and Tustin Ranch 12/8/2023 8 AM ** ** OC Animal Shelter 12/8/2023 8 AM 16 Good OCHCA 12/8/2023 8 AM 7 Good The District (Costco) 12/8/2023 8 AM 8 Good Tustin Field Services 12/8/2023 8 AM 6 Good Tustin High School 12/8/2023 8 AM 1 Good Tustin Legacy Park 12/8/2023 8 AM 11 Good Valencia and Armstrong 12/8/2023 8 AM 13 Good Valencia and Columbus Square 12/8/2023 8 AM 9 Good Valencia and Legacy 12/8/2023 8 AM 18 Good Victory and Tustin Ranch Rd. 12/8/2023 8 AM 20 Good Warner and Armstrong 12/8/2023 8 AM 7 Good Warner Avenue 12/8/2023 8 AM 8 Good WR Nelson Elementary 12/8/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purpl Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for e. Ii 425 to 504 Health warning of emergency conditions: ever•ne is more likely to be affected. Saturday, December 9, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to power failure. Data gap due to instrument malfunction, instrument recalibrated. Very Unhealthy Hazardous (355 to 424) (425-504) Location Century High School 24-Hour Period Ending 12/9/2023 8 AM Matter 9 Level of • Good Columbus Square Park 12/9/2023 8 AM 13 Good Fire Station 21 12/9/2023 8 AM 5 Good Fire Station 28 12/9/2023 8 AM 15 Good Fire Station 37 12/9/2023 8 AM 15 Good Fire Station 6 12/9/2023 8 AM 20 Good Hangar Fenceline - E Side 12/9/2023 8 AM 15 Good Hangar Fenceline - N Center 12/9/2023 8 AM 17 Good Hangar Fenceline - N Corner 12/9/2023 8 AM 19 Good Hangar Fenceline - NE Corner 12/9/2023 8 AM 20 Good Hangar Fenceline - NE Side 12/9/2023 8 AM 11 Good Hangar Fenceline - S Corner** 12/9/2023 8 AM 18 Good Hangar Fenceline - S Side 12/9/2023 8 AM 29 Good Hangar Fenceline - SW Corner 12/9/2023 8 AM 27 Good Hangar Fenceline - SW Side 12/9/2023 8 AM 24 Good Hangar Fenceline - W Side 12/9/2023 8 AM 19 Good Heritage Elementary 12/9/2023 8 AM 19 Good Legacy Academy 12/9/2023 8 AM 23 Good Legacy Road 12/9/2023 8 AM 22 Good Moffett and Tustin Ranch*** 12/9/2023 8 AM 26 Good OC Animal Shelter 12/9/2023 8 AM 22 Good OCHCA 12/9/2023 8 AM 7 Good The District (Costco) 12/9/2023 8 AM 8 Good Tustin Field Services 12/9/2023 8 AM 7 Good Tustin High School 12/9/2023 8 AM 2 Good Tustin Legacy Park 12/9/2023 8 AM 10 Good Valencia and Armstrong** 12/9/2023 8 AM 16 Good Valencia and Columbus Square 12/9/2023 8 AM 11 Good Valencia and Legacy 12/9/2023 8 AM 21 Good Victory and Tustin Ranch Rd. 12/9/2023 8 AM 29 Good Warner and Armstrong 12/9/2023 8 AM 11 Good Warner Avenue 12/9/2023 8 AM 14 Good WR Nelson Elementary 12/9/2023 8 AM 15 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Sunday, December 10, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Wnhealthy Sensitive Groups (255 to Unhealthy EL(155 to 254)354) See below for further category descriptions. ** Data gap due to power failure. Very Unhealthy Hazardous (355 to 424) (425-504) Location Century High School Period Ending 12/10/2023 8 AM Matter 8 Level of Concern Good Columbus Square Park 12/10/2023 8 AM 6 Good Fire Station 21 12/10/2023 8 AM 9 Good Fire Station 28 12/10/2023 8 AM 17 Good Fire Station 37 12/10/2023 8 AM 4 Good Fire Station 6 12/10/2023 8 AM 20 Good Hangar Fenceline - E Side 12/10/2023 8 AM 7 Good Hangar Fenceline - N Center 12/10/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/10/2023 8 AM 8 Good Hangar Fenceline - NE Corner 12/10/2023 8 AM 10 Good Hangar Fenceline - NE Side 12/10/2023 8 AM 4 Good Hangar Fenceline - S Corner 12/10/2023 8 AM 11 Good Hangar Fenceline - S Side 12/10/2023 8 AM 20 Good Hangar Fenceline - SW Corner 12/10/2023 8 AM 10 Good Hangar Fenceline - SW Side 12/10/2023 8 AM 11 Good Hangar Fenceline - W Side 12/10/2023 8 AM 16 Good Heritage Elementary 12/10/2023 8 AM 8 Good Legacy Academy 12/10/2023 8 AM 10 Good Legacy Road 12/10/2023 8 AM 10 Good Moffett and Tustin Ranch 12/10/2023 8 AM 12 Good OC Animal Shelter 12/10/2023 8 AM 11 Good OCHCA 12/10/2023 8 AM 5 Good The District (Costco) 12/10/2023 8 AM 3 Good Tustin Field Services 12/10/2023 8 AM 9 Good Tustin High School 12/10/2023 8 AM 2 Good Tustin Legacy Park 12/10/2023 8 AM 8 Good Valencia and Armstrong 12/10/2023 8 AM 6 Good Valencia and Columbus Square 12/10/2023 8 AM 4 Good Valencia and Legacy 12/10/2023 8 AM 9 Good Victory and Tustin Ranch Rd. 12/10/2023 8 AM 15 Good Warner and Armstrong" 12/10/2023 8 AM 8 Good Warner Avenue 12/10/2023 8 AM 6 Good WR Nelson Elementary 12/10/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Monday, December 11, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/11/2023 8 AM Matter 29 Level of Concern Good Columbus Square Park 12/11/2023 8 AM 7 Good Fire Station 21 12/11/2023 8 AM 20 Good Fire Station 28 12/11/2023 8 AM 28 Good Fire Station 37 12/11/2023 8 AM 7 Good Fire Station 6 12/11/2023 8 AM 36 Good Hangar Fenceline - E Side 12/11/2023 8 AM 10 Good Hangar Fenceline - N Center 12/11/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/11/2023 8 AM 12 Good Hangar Fenceline - NE Corner 12/11/2023 8 AM 15 Good Hangar Fenceline - NE Side 12/11/2023 8 AM 4 Good Hangar Fenceline - S Corner 12/11/2023 8 AM 18 Good Hangar Fenceline - S Side 12/11/2023 8 AM 21 Good Hangar Fenceline - SW Corner 12/11/2023 8 AM 19 Good Hangar Fenceline - SW Side 12/11/2023 8 AM 14 Good Hangar Fenceline - W Side 12/11/2023 8 AM 14 Good Heritage Elementary 12/11/2023 8 AM 13 Good Legacy Academy 12/11/2023 8 AM 12 Good Legacy Road 12/11/2023 8 AM 11 Good Moffett and Tustin Ranch 12/11/2023 8 AM 15 Good OC Animal Shelter 12/11/2023 8 AM 13 Good OCHCA 12/11/2023 8 AM 16 Good The District (Costco) 12/11/2023 8 AM 19 Good Tustin Field Services 12/11/2023 8 AM 6 Good Tustin High School 12/11/2023 8 AM 4 Good Tustin Legacy Park 12/11/2023 8 AM 24 Good Valencia and Armstrong 12/11/2023 8 AM 8 Good Valencia and Columbus Square 12/11/2023 8 AM 5 Good Valencia and Legacy 12/11/2023 8 AM 10 Good Victory and Tustin Ranch Rd. 12/11/2023 8 AM 28 Good Warner and Armstrong 12/11/2023 8 AM ** ** Warner Avenue 12/11/2023 8 AM 9 Good WR Nelson Elementary 12/11/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Tuesday, December 12, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/12/2023 8 AM Matter 36 Level of Concern Good Columbus Square Park 12/12/2023 8 AM 9 Good Fire Station 21 12/12/2023 8 AM 33 Good Fire Station 28 12/12/2023 8 AM 46 Good Fire Station 37 12/12/2023 8 AM 13 Good Fire Station 6 12/12/2023 8 AM 44 Good Hangar Fenceline - E Side 12/12/2023 8 AM 12 Good Hangar Fenceline - N Center 12/12/2023 8 AM 12 Good Hangar Fenceline - N Corner 12/12/2023 8 AM 15 Good Hangar Fenceline - NE Corner 12/12/2023 8 AM 16 Good Hangar Fenceline - NE Side 12/12/2023 8 AM 5 Good Hangar Fenceline - S Corner 12/12/2023 8 AM 21 Good Hangar Fenceline - S Side 12/12/2023 8 AM 18 Good Hangar Fenceline - SW Corner 12/12/2023 8 AM 25 Good Hangar Fenceline - SW Side 12/12/2023 8 AM 15 Good Hangar Fenceline - W Side 12/12/2023 8 AM 14 Good Heritage Elementary 12/12/2023 8 AM 16 Good Legacy Academy 12/12/2023 5 AM 16 Good Legacy Road 12/12/2023 8 AM 15 Good Moffett and Tustin Ranch 12/12/2023 8 AM 22 Good OC Animal Shelter 12/12/2023 8 AM 18 Good OCHCA 12/12/2023 8 AM 11 Good The District (Costco) 12/12/2023 8 AM 14 Good Tustin Field Services 12/12/2023 8 AM 7 Good Tustin High School 12/12/2023 8 AM 5 Good Tustin Legacy Park 12/12/2023 8 AM 16 Good Valencia and Armstrong 12/12/2023 8 AM 11 Good Valencia and Columbus Square 12/12/2023 8 AM 9 Good Valencia and Legacy 12/12/2023 8 AM 14 Good Victory and Tustin Ranch Rd. 12/12/2023 8 AM 32 Good Warner and Armstrong 12/12/2023 8 AM 9 Good Warner Avenue 12/12/2023 8 AM 18 Good WR Nelson Elementary 12/12/2023 8 AM 31 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Wednesday, December 13, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/13/2023 8 AM Matter 59 Level of Concern Moderate Columbus Square Park 12/13/2023 8 AM 15 Good Fire Station 21 12/13/2023 8 AM 71 Moderate Fire Station 28 12/13/2023 8 AM 49 Good Fire Station 37 12/13/2023 8 AM 13 Good Fire Station 6 12/13/2023 8 AM 52 Good Hangar Fenceline - E Side 12/13/2023 8 AM 17 Good Hangar Fenceline - N Center 12/13/2023 8 AM 16 Good Hangar Fenceline - N Corner 12/13/2023 8 AM 21 Good Hangar Fenceline - NE Corner 12/13/2023 8 AM 22 Good Hangar Fenceline - NE Side 12/13/2023 8 AM 8 Good Hangar Fenceline - S Corner 12/13/2023 8 AM 24 Good Hangar Fenceline - S Side 12/13/2023 8 AM 24 Good Hangar Fenceline - SW Corner 12/13/2023 8 AM 25 Good Hangar Fenceline - SW Side 12/13/2023 8 AM 22 Good Hangar Fenceline - W Side 12/13/2023 8 AM 19 Good Heritage Elementary 12/13/2023 8 AM 21 Good Legacy Academy 12/13/2023 8 AM 26 Good Legacy Road 12/13/2023 8 AM 24 Good Moffett and Tustin Ranch 12/13/2023 8 AM 32 Good OC Animal Shelter 12/13/2023 8 AM 24 Good OCHCA 12/13/2023 8 AM 13 Good The District (Costco) 12/13/2023 8 AM 14 Good Tustin Field Services 12/13/2023 8 AM 9 Good Tustin High School 12/13/2023 8 AM 11 Good Tustin Legacy Park 12/13/2023 8 AM 28 Good Valencia and Armstrong 12/13/2023 8 AM 17 Good Valencia and Columbus Square 12/13/2023 8 AM 12 Good Valencia and Legacy 12/13/2023 8 AM 23 Good Victory and Tustin Ranch Rd. 12/13/2023 8 AM 28 Good Warner and Armstrong 12/13/2023 8 AM 12 Good Warner Avenue 12/13/2023 8 AM 18 Good WR Nelson Elementary 12/13/2023 8 AM 54 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Thursday, December 14, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/14/2023 8 AM Matter 51 Level of Concern Good Columbus Square Park 12/14/2023 8 AM 22 Good Fire Station 21 12/14/2023 8 AM 51 Good Fire Station 28 12/14/2023 8 AM 44 Good Fire Station 37 12/14/2023 8 AM 24 Good Fire Station 6 12/14/2023 8 AM 50 Good Hangar Fenceline - E Side 12/14/2023 8 AM 29 Good Hangar Fenceline - N Center 12/14/2023 8 AM 23 Good Hangar Fenceline - N Corner 12/14/2023 8 AM 32 Good Hangar Fenceline - NE Corner 12/14/2023 8 AM 33 Good Hangar Fenceline - NE Side 12/14/2023 8 AM 14 Good Hangar Fenceline - S Corner 12/14/2023 8 AM 35 Good Hangar Fenceline - S Side 12/14/2023 8 AM 36 Good Hangar Fenceline - SW Corner 12/14/2023 8 AM 35 Good Hangar Fenceline - SW Side 12/14/2023 8 AM 34 Good Hangar Fenceline - W Side 12/14/2023 8 AM 29 Good Heritage Elementary 12/14/2023 8 AM 31 Good Legacy Academy 12/14/2023 8 AM 32 Good Legacy Road 12/14/2023 8 AM 37 Good Moffett and Tustin Ranch 12/14/2023 8 AM 46 Good OC Animal Shelter 12/14/2023 8 AM 35 Good OCHCA 12/14/2023 8 AM 12 Good The District (Costco) 12/14/2023 8 AM 16 Good Tustin Field Services 12/14/2023 8 AM 7 Good Tustin High School 12/14/2023 8 AM 11 Good Tustin Legacy Park 12/14/2023 8 AM 20 Good Valencia and Armstrong 12/14/2023 8 AM 28 Good Valencia and Columbus Square 12/14/2023 8 AM 17 Good Valencia and Legacy 12/14/2023 8 AM 36 Good Victory and Tustin Ranch Rd. 12/14/2023 8 AM 39 Good Warner and Armstrong 12/14/2023 8 AM 18 Good Warner Avenue 12/14/2023 8 AM 27 Good WR Nelson Elementary 12/14/2023 8 AM 40 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Friday, December 15, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/15/2023 8 AM Matter 32 Level of Concern Good Columbus Square Park 12/15/2023 8 AM 20 Good Fire Station 21 12/15/2023 8 AM 23 Good Fire Station 28 12/15/2023 8 AM 42 Good Fire Station 37 12/15/2023 8 AM 22 Good Fire Station 6 12/15/2023 8 AM 40 Good Hangar Fenceline - E Side 12/15/2023 8 AM 23 Good Hangar Fenceline - N Center 12/15/2023 8 AM 24 Good Hangar Fenceline - N Corner 12/15/2023 8 AM 27 Good Hangar Fenceline - NE Corner 12/15/2023 8 AM 29 Good Hangar Fenceline - NE Side 12/15/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/15/2023 8 AM 33 Good Hangar Fenceline - S Side 12/15/2023 8 AM 41 Good Hangar Fenceline - SW Corner 12/15/2023 8 AM 32 Good Hangar Fenceline - SW Side 12/15/2023 8 AM 29 Good Hangar Fenceline - W Side 12/15/2023 8 AM 25 Good Heritage Elementary 12/15/2023 8 AM 29 Good Legacy Academy 12/15/2023 8 AM 24 Good Legacy Road 12/15/2023 8 AM 30 Good Moffett and Tustin Ranch 12/15/2023 8 AM 37 Good OC Animal Shelter 12/15/2023 8 AM 32 Good OCHCA 12/15/2023 8 AM 11 Good The District (Costco) 12/15/2023 8 AM 19 Good Tustin Field Services 12/15/2023 8 AM 6 Good Tustin High School 12/15/2023 8 AM 6 Good Tustin Legacy Park 12/15/2023 8 AM 22 Good Valencia and Armstrong 12/15/2023 7 AM 24 Good Valencia and Columbus Square 12/15/2023 8 AM 19 Good Valencia and Legacy 12/15/2023 8 AM 30 Good Victory and Tustin Ranch Rd. 12/15/2023 8 AM 38 Good Warner and Armstrong 12/15/2023 8 AM 21 Good Warner Avenue 12/15/2023 8 AM 32 Good WR Nelson Elementary 12/15/2023 8 AM 27 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Saturday, December 16, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/16/2023 8 AM Matter 11 Level of Concern Good Columbus Square Park 12/16/2023 8 AM 13 Good Fire Station 21 12/16/2023 8 AM 12 Good Fire Station 28 12/16/2023 8 AM 24 Good Fire Station 37 12/16/2023 8 AM 15 Good Fire Station 6 12/16/2023 8 AM 29 Good Hangar Fenceline - E Side 12/16/2023 8 AM 15 Good Hangar Fenceline - N Center 12/16/2023 8 AM 15 Good Hangar Fenceline - N Corner 12/16/2023 8 AM 19 Good Hangar Fenceline - NE Corner 12/16/2023 8 AM 21 Good Hangar Fenceline - NE Side 12/16/2023 8 AM 7 Good Hangar Fenceline - S Corner 12/16/2023 8 AM 24 Good Hangar Fenceline - S Side 12/16/2023 8 AM 41 Good Hangar Fenceline - SW Corner 12/16/2023 8 AM 23 Good Hangar Fenceline - SW Side 12/16/2023 8 AM 22 Good Hangar Fenceline - W Side 12/16/2023 8 AM 22 Good Heritage Elementary 12/16/2023 8 AM 20 Good Legacy Academy 12/16/2023 8 AM 14 Good Legacy Road 12/16/2023 8 AM 19 Good Moffett and Tustin Ranch 12/16/2023 8 AM 18 Good OC Animal Shelter 12/16/2023 8 AM 20 Good OCHCA 12/16/2023 8 AM 4 Good The District (Costco) 12/16/2023 8 AM 5 Good Tustin Field Services 12/16/2023 8 AM 8 Good Tustin High School 12/16/2023 8 AM 2 Good Tustin Legacy Park 12/16/2023 8 AM 9 Good Valencia and Armstrong 12/16/2023 8 AM 13 Good Valencia and Columbus Square 12/16/2023 8 AM 10 Good Valencia and Legacy 12/16/2023 8 AM 21 Good Victory and Tustin Ranch Rd. 12/16/2023 8 AM 27 Good Warner and Armstrong 12/16/2023 8 AM 13 Good Warner Avenue 12/16/2023 8 AM 18 Good WR Nelson Elementary 12/16/2023 8 AM 16 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Sunday, December 17, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy u Sensitive GrouUnhealthy Very Unhealthy ...us (0 to 54) (55 to 154) ps (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/17/2023 8 AM Matter 26 Level of Concern Good Columbus Square Park 12/17/2023 8 AM 13 Good Fire Station 21 12/17/2023 8 AM 15 Good Fire Station 28 12/17/2023 8 AM 30 Good Fire Station 37 12/17/2023 8 AM 14 Good Fire Station 6 12/17/2023 8 AM 33 Good Hangar Fenceline - E Side 12/17/2023 8 AM 16 Good Hangar Fenceline - N Center 12/17/2023 8 AM 13 Good Hangar Fenceline - N Corner 12/17/2023 8 AM 18 Good Hangar Fenceline - NE Corner 12/17/2023 8 AM 22 Good Hangar Fenceline - NE Side 12/17/2023 8 AM 7 Good Hangar Fenceline - S Corner 12/17/2023 8 AM 24 Good Hangar Fenceline - S Side 12/17/2023 8 AM 36 Good Hangar Fenceline - SW Corner 12/17/2023 8 AM 23 Good Hangar Fenceline - SW Side 12/17/2023 8 AM 19 Good Hangar Fenceline - W Side 12/17/2023 8 AM 18 Good Heritage Elementary 12/17/2023 8 AM 17 Good Legacy Academy 12/17/2023 8 AM 13 Good Legacy Road 12/17/2023 8 AM 18 Good Moffett and Tustin Ranch 12/17/2023 8 AM 21 Good OC Animal Shelter 12/17/2023 8 AM 20 Good OCHCA 12/17/2023 8 AM 8 Good The District (Costco) 12/17/2023 8 AM 6 Good Tustin Field Services 12/17/2023 8 AM 7 Good Tustin High School 12/17/2023 8 AM 3 Good Tustin Legacy Park 12/17/2023 8 AM 10 Good Valencia and Armstrong 12/17/2023 8 AM 14 Good Valencia and Columbus Square 12/17/2023 8 AM 11 Good Valencia and Legacy 12/17/2023 8 AM 19 Good Victory and Tustin Ranch Rd. 12/17/2023 8 AM 33 Good Warner and Armstrong 12/17/2023 8 AM 15 Good Warner Avenue 12/17/2023 8 AM 21 Good WR Nelson Elementary 12/17/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Monday, December 18, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/18/2023 8 AM Matter 27 Level of Concern Good Columbus Square Park 12/18/2023 8 AM 18 Good Fire Station 21 12/18/2023 8 AM 24 Good Fire Station 28 12/18/2023 8 AM 35 Good Fire Station 37 12/18/2023 8 AM 17 Good Fire Station 6 12/18/2023 8 AM 41 Good Hangar Fenceline - E Side 12/18/2023 8 AM 22 Good Hangar Fenceline - N Center 12/18/2023 8 AM 21 Good Hangar Fenceline - N Corner 12/18/2023 8 AM 26 Good Hangar Fenceline - NE Corner 12/18/2023 8 AM 18 Good Hangar Fenceline - NE Side 12/18/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/18/2023 8 AM 31 Good Hangar Fenceline - S Side 12/18/2023 8 AM 33 Good Hangar Fenceline - SW Corner 12/18/2023 8 AM 27 Good Hangar Fenceline - SW Side 12/18/2023 8 AM 28 Good Hangar Fenceline - W Side 12/18/2023 8 AM 26 Good Heritage Elementary 12/18/2023 8 AM 25 Good Legacy Academy 12/18/2023 8 AM 22 Good Legacy Road 12/18/2023 8 AM 25 Good Moffett and Tustin Ranch 12/18/2023 8 AM 35 Good OC Animal Shelter 12/18/2023 8 AM 28 Good OCHCA 12/18/2023 8 AM 9 Good The District (Costco) 12/18/2023 8 AM 14 Good Tustin Field Services 12/18/2023 8 AM 7 Good Tustin High School 12/18/2023 8 AM 7 Good Tustin Legacy Park 12/18/2023 8 AM 15 Good Valencia and Armstrong 12/18/2023 8 AM 21 Good Valencia and Columbus Square 12/18/2023 8 AM 17 Good Valencia and Legacy 12/18/2023 8 AM 26 Good Victory and Tustin Ranch Rd. 12/18/2023 8 AM 32 Good Warner and Armstrong 12/18/2023 8 AM 19 Good Warner Avenue 12/18/2023 8 AM 28 Good WR Nelson Elementary 12/18/2023 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Tuesday, December 19, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Century High School 24-Hour Period Ending 12/19/2023 8 AM Matter 28 Level of Concern Good Columbus Square Park 12/19/2023 8 AM 13 Good Fire Station 21 12/19/2023 8 AM 24 Good Fire Station 28 12/19/2023 8 AM 30 Good Fire Station 37 12/19/2023 8 AM 11 Good Fire Station 6 12/19/2023 8 AM 37 Good Hangar Fenceline - E Side 12/19/2023 8 AM 14 Good Hangar Fenceline - N Center 12/19/2023 8 AM 12 Good Hangar Fenceline - N Corner 12/19/2023 8 AM 16 Good Hangar Fenceline - NE Corner 12/19/2023 8 AM 18 Good Hangar Fenceline - NE Side 12/19/2023 8 AM 7 Good Hangar Fenceline - S Corner 12/19/2023 8 AM 19 Good Hangar Fenceline - S Side 12/19/2023 8 AM 18 Good Hangar Fenceline - SW Corner 12/19/2023 8 AM 17 Good Hangar Fenceline - SW Side 12/19/2023 8 AM 17 Good Hangar Fenceline - W Side 12/19/2023 8 AM 15 Good Heritage Elementary 12/19/2023 8 AM 17 Good Legacy Academy 12/19/2023 8 AM 16 Good Legacy Road 12/19/2023 8 AM 17 Good Moffett and Tustin Ranch 12/19/2023 8 AM 21 Good OC Animal Shelter 12/19/2023 8 AM 18 Good OCHCA 12/19/2023 8 AM 7 Good The District (Costco) 12/19/2023 8 AM 7 Good Tustin Field Services 12/19/2023 7 AM 4 Good Tustin High School 12/19/2023 7 AM 3 Good Tustin Legacy Park 12/19/2023 8 AM 11 Good Valencia and Armstrong 12/19/2023 8 AM 14 Good Valencia and Columbus Square 12/19/2023 8 AM 11 Good Valencia and Legacy 12/19/2023 8 AM 18 Good Victory and Tustin Ranch Rd. 12/19/2023 8 AM 22 Good Warner and Armstrong 12/19/2023 8 AM 11 Good Warner Avenue 12/19/2023 8 AM 18 Good WR Nelson Elementary 12/19/2023 8 AM 20 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. 425 to 504 Health warning of emergencV conditions:Hazardous - everyone . likely . •- affected. Wednesday, December 20, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/20/2023 8 AM Matter 10 Level of Concern Good Fire Station 37 12/20/2023 8 AM 9 Good Hangar Fenceline - E Side 12/20/2023 8 AM 10 Good Hangar Fenceline - N Center 12/20/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - NE Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - NE Side 12/20/2023 6 AM 5 Good Hangar Fenceline - S Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - S Side 12/20/2023 8 AM 12 Good Hangar Fenceline - SW Corner 12/20/2023 8 AM 12 Good Hangar Fenceline - SW Side 12/20/2023 8 AM 13 Good Hangar Fenceline - W Side 12/20/2023 8 AM 11 Good Heritage Elementary 12/20/2023 8 AM 13 Good Legacy Academy 12/20/2023 8 AM 11 Good Legacy Road 12/20/2023 8 AM 13 Good Moffett and Tustin Ranch 12/20/2023 8 AM 15 Good OC Animal Shelter 12/20/2023 8 AM 14 Good Valencia and Armstrong 12/20/2023 7 AM 11 Good Valencia and Columbus Square 12/20/2023 8 AM 9 Good Valencia and Legacy 12/20/2023 8 AM 12 Good Victory and Tustin Ranch Rd. 12/20/2023 8 AM 14 Good Warner and Armstrong 12/20/2023 8 AM 7 Good Warner Avenue 12/20/2023 8 AM 14 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Friday, December 22, 2023 North Hangar Fire Incident I City of Tustin Aik quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very Unhealthy (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) IL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/22/2023 8 AM Matter 4 Level of • Good Fire Station 37 12/22/2023 8 AM 5 Good Hangar Fenceline - E Side 12/22/2023 8 AM 5 Good Hangar Fenceline - N Center 12/22/2023 8 AM 8 Good Hangar Fenceline - N Corner 12/22/2023 8 AM 5 Good Hangar Fenceline - NE Corner 12/22/2023 8 AM 6 Good Hangar Fenceline - NE Side 12/22/2023 8 AM 6 Good Hangar Fenceline - S Corner 12/22/2023 8 AM 5 Good Hangar Fenceline - S Side 12/22/2023 8 AM 5 Good Hangar Fenceline - SW Corner 12/22/2023 8 AM 5 Good Hangar Fenceline - SW Side 12/22/2023 8 AM 6 Good Hangar Fenceline - W Side 12/22/2023 8 AM 5 Good Heritage Elementary 12/22/2023 8 AM 5 Good Legacy Academy 12/22/2023 8 AM 5 Good Legacy Road 12/22/2023 8 AM 5 Good Moffett and Tustin Ranch 12/22/2023 8 AM 8 Good OC Animal Shelter 12/22/2023 8 AM 6 Good Valencia and Armstrong 12/22/2023 7 AM 4 Good Valencia and Columbus Square 12/22/2023 8 AM 3 Good Valencia and Legacy 12/22/2023 8 AM 4 Good Victory and Tustin Ranch Rd. 12/22/2023 8 AM 8 Good Warner and Armstrong 12/22/2023 8 AM 3 Good Warner Avenue 12/22/2023 8 AM 6 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Saturday, December 23, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/23/2023 8 AM Matter 5 Level of Concern Good Fire Station 37 12/23/2023 8 AM 6 Good Hangar Fenceline - E Side 12/23/2023 8 AM 6 Good Hangar Fenceline - N Center 12/23/2023 8 AM 9 Good Hangar Fenceline - N Corner 12/23/2023 8 AM 7 Good Hangar Fenceline - NE Corner 12/23/2023 8 AM 8 Good Hangar Fenceline - NE Side 12/23/2023 8 AM 12 Good Hangar Fenceline - S Corner 12/23/2023 8 AM 8 Good Hangar Fenceline - S Side 12/23/2023 8 AM 7 Good Hangar Fenceline - SW Corner 12/23/2023 8 AM 7 Good Hangar Fenceline - SW Side 12/23/2023 8 AM 8 Good Hangar Fenceline - W Side 12/23/2023 8 AM 6 Good Heritage Elementary 12/23/2023 8 AM 8 Good Legacy Academy 12/23/2023 8 AM 8 Good Legacy Road 12/23/2023 8 AM 7 Good Moffett and Tustin Ranch 12/23/2023 8 AM 11 Good OC Animal Shelter 12/23/2023 8 AM 9 Good Valencia and Armstrong 12/23/2023 7 AM 7 Good Valencia and Columbus Square 12/23/2023 8 AM 5 Good Valencia and Legacy 12/23/2023 8 AM 6 Good Victory and Tustin Ranch Rd. 12/23/2023 8 AM 9 Good Warner and Armstrong 12/23/2023 8 AM 4 Good Warner Avenue 12/23/2023 8 AM 7 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Sunday, December 24, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/24/2023 8 AM Matter 9 Level of Concern Good Fire Station 37 12/24/2023 8 AM 8 Good Hangar Fenceline - E Side 12/24/2023 8 AM 10 Good Hangar Fenceline - N Center 12/24/2023 8 AM 14 Good Hangar Fenceline - N Corner 12/24/2023 8 AM 12 Good Hangar Fenceline - NE Corner 12/24/2023 8 AM 12 Good Hangar Fenceline - NE Side 12/24/2023 8 AM 18 Good Hangar Fenceline - S Corner 12/24/2023 8 AM 12 Good Hangar Fenceline - S Side 12/24/2023 8 AM 12 Good Hangar Fenceline - SW Corner 12/24/2023 8 AM 11 Good Hangar Fenceline - SW Side 12/24/2023 8 AM 11 Good Hangar Fenceline - W Side 12/24/2023 8 AM 9 Good Heritage Elementary 12/24/2023 8 AM 12 Good Legacy Academy 12/24/2023 8 AM 12 Good Legacy Road 12/24/2023 8 AM 13 Good Moffett and Tustin Ranch 12/24/2023 8 AM 17 Good OC Animal Shelter 12/24/2023 8 AM 14 Good Valencia and Armstrong 12/24/2023 8 AM 11 Good Valencia and Columbus Square 12/24/2023 8 AM 8 Good Valencia and Legacy 12/24/2023 8 AM 7 Good Victory and Tustin Ranch Rd. 12/24/2023 8 AM 14 Good Warner and Armstrong 12/24/2023 8 AM 7 Good Warner Avenue 12/24/2023 8 AM 12 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Monday, December 25, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/25/2023 8 AM Matter 30 Level of Concern Good Fire Station 37 12/25/2023 8 AM 67 Moderate Hangar Fenceline - E Side 12/25/2023 8 AM 33 Good Hangar Fenceline - N Center 12/25/2023 8 AM 42 Good Hangar Fenceline - N Corner 12/25/2023 8 AM 37 Good Hangar Fenceline - NE Corner 12/25/2023 8 AM 34 Good Hangar Fenceline - NE Side 12/25/2023 8 AM 44 Good Hangar Fenceline - S Corner 12/25/2023 8 AM 36 Good Hangar Fenceline - S Side 12/25/2023 8 AM 35 Good Hangar Fenceline - SW Corner 12/25/2023 8 AM 36 Good Hangar Fenceline - SW Side 12/25/2023 8 AM 38 Good Hangar Fenceline - W Side 12/25/2023 8 AM 31 Good Heritage Elementary 12/25/2023 8 AM 38 Good Legacy Academy 12/25/2023 8 AM 36 Good Legacy Road 12/25/2023 8 AM 41 Good Moffett and Tustin Ranch 12/25/2023 8 AM 43 Good OC Animal Shelter 12/25/2023 8 AM 41 Good Valencia and Armstrong 12/25/2023 7 AM 35 Good Valencia and Columbus Square 12/25/2023 8 AM 27 Good Valencia and Legacy 12/25/2023 8 AM 23 Good Victory and Tustin Ranch Rd. 12/25/2023 8 AM 33 Good Warner and Armstrong 12/25/2023 8 AM 21 Good Warner Avenue 12/25/2023 8 AM 35 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Tuesday, December 26, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy u Sensitive GrouUnhealthy Very Unhealthy • •us (0 to 54) (55 to 154) ps (155 to 254) (255 to 354) (355 to 424) (425-504)* See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Columbus Square Park PeriodLocation 24-Hour Ending 12/26/2023 8 AM Particulate Matter • 22 Level of Concern Good Fire Station 37 12/26/2023 8 AM 26 Good Hangar Fenceline - E Side 12/26/2023 8 AM 23 Good Hangar Fenceline - N Center 12/26/2023 8 AM 30 Good Hangar Fenceline - N Corner 12/26/2023 8 AM 26 Good Hangar Fenceline - NE Corner 12/26/2023 8 AM 25 Good Hangar Fenceline - NE Side 12/26/2023 8 AM 33 Good Hangar Fenceline - S Corner 12/26/2023 8 AM 26 Good Hangar Fenceline - S Side 12/26/2023 8 AM 23 Good Hangar Fenceline - SW Corner 12/26/2023 8 AM 27 Good Hangar Fenceline - SW Side 12/26/2023 8 AM 29 Good Hangar Fenceline - W Side 12/26/2023 8 AM 22 Good Heritage Elementary 12/26/2023 8 AM 26 Good Legacy Academy 12/26/2023 8 AM 29 Good Legacy Road 12/26/2023 8 AM 29 Good Moffett and Tustin Ranch 12/26/2023 8 AM 34 Good OC Animal Shelter 12/26/2023 8 AM 29 Good Valencia and Armstrong 12/26/2023 8 AM 23 Good Valencia and Columbus Square 12/26/2023 8 AM 21 Good Valencia and Legacy 12/26/2023 8 AM 19 Good Victory and Tustin Ranch Rd. 12/26/2023 8 AM 29 Good Warner and Armstrong 12/26/2023 8 AM 19 Good Warner Avenue 12/26/2023 8 AM 28 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Hazardous 425 "to504 arning of emergency Maroon - conditions: ever. . likely ..- affected. Wednesday, December 27, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for Unhealthy Very UnhealthyHazardous (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/27/2023 8 AM Matter 40 Level of Concern Good Fire Station 37 12/27/2023 8 AM 47 Good Hangar Fenceline - E Side 12/27/2023 8 AM 48 Good Hangar Fenceline - N Center 12/27/2023 8 AM 58 Moderate Hangar Fenceline - N Corner 12/27/2023 8 AM 53 Good Hangar Fenceline - NE Corner 12/27/2023 8 AM 52 Good Hangar Fenceline - NE Side 12/27/2023 8 AM 62 Moderate Hangar Fenceline - S Corner 12/27/2023 8 AM 53 Good Hangar Fenceline - S Side 12/27/2023 8 AM 54 Good Hangar Fenceline - SW Corner 12/27/2023 8 AM 54 Moderate Hangar Fenceline - SW Side 12/27/2023 8 AM 58 Moderate Hangar Fenceline - W Side 12/27/2023 8 AM 48 Good Heritage Elementary 12/27/2023 8 AM 52 Good Legacy Academy 12/27/2023 8 AM 58 Moderate Legacy Road 12/27/2023 8 AM 61 Moderate Moffett and Tustin Ranch 12/27/2023 8 AM 68 Moderate OC Animal Shelter 12/27/2023 8 AM 60 Moderate Valencia and Armstrong 12/27/2023 7 AM 49 Good Valencia and Columbus Square 12/27/2023 8 AM 40 Good Valencia and Legacy 12/27/2023 12 AM 38 Good Victory and Tustin Ranch Rd. 12/27/2023 8 AM 54 Moderate Warner and Armstrong 12/27/2023 8 AM 35 Good Warner Avenue 12/27/2023 8 AM 56 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects i d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Thursday, December 28, 2023 North Hangar Fire Incident I City of Tustin Aik quality updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate (0 to 54) (55 to 154) Unhealthy for Sensitive Groups IL(155 to 254) W Unhealthy (255 to 354) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Very Unhealthy (355 to 424) Location Columbus Square Park 24-Hour Period Ending 12/28/2023 8 AM Matter 51 Level of • Good Fire Station 37 12/28/2023 8 AM 62 Moderate Hangar Fenceline - E Side 12/28/2023 8 AM 59 Moderate Hangar Fenceline - N Center 12/28/2023 8 AM 72 Moderate Hangar Fenceline - N Corner 12/28/2023 8 AM 69 Moderate Hangar Fenceline - NE Corner 12/28/2023 8 AM 65 Moderate Hangar Fenceline - NE Side 12/28/2023 8 AM 75 Moderate Hangar Fenceline - S Corner 12/28/2023 8 AM 67 Moderate Hangar Fenceline - S Side 12/28/2023 8 AM 69 Moderate Hangar Fenceline - SW Corner 12/28/2023 8 AM 68 Moderate Hangar Fenceline - SW Side 12/28/2023 8 AM 74 Moderate Hangar Fenceline - W Side 12/28/2023 8 AM 61 Moderate Heritage Elementary 12/28/2023 8 AM 66 Moderate Legacy Academy 12/28/2023 8 AM 77 Moderate Legacy Road 12/28/2023 8 AM 71 Moderate Moffett and Tustin Ranch 12/28/2023 8 AM 84 Moderate OC Animal Shelter 12/28/2023 8 AM 74 Moderate Valencia and Armstrong 12/28/2023 8 AM 62 Moderate Valencia and Columbus Square 12/28/2023 8 AM 53 Good Valencia and Legacy 12/28/2023 8 AM 50 Good Victory and Tustin Ranch Rd. 12/28/2023 8 AM 67 Moderate Warner and Armstrong 12/28/2023 8 AM 45 Good Warner Avenue 12/28/2023 8 AM 71 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is increased for everyone. Friday, December 29, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/29/2023 8 AM Matter 58 Level of Concern Moderate Fire Station 37 12/29/2023 8 AM 63 Moderate Hangar Fenceline - E Side 12/29/2023 8 AM 63 Moderate Hangar Fenceline - N Center 12/29/2023 8 AM 76 Moderate Hangar Fenceline - N Corner 12/29/2023 8 AM 74 Moderate Hangar Fenceline - NE Corner 12/29/2023 8 AM 69 Moderate Hangar Fenceline - NE Side 12/29/2023 8 AM 79 Moderate Hangar Fenceline - S Corner 12/29/2023 8 AM 71 Moderate Hangar Fenceline - S Side 12/29/2023 8 AM 75 Moderate Hangar Fenceline - SW Corner 12/29/2023 8 AM 73 Moderate Hangar Fenceline - SW Side 12/29/2023 8 AM 78 Moderate Hangar Fenceline - W Side 12/29/2023 8 AM 65 Moderate Heritage Elementary 12/29/2023 8 AM 72 Moderate Legacy Academy 12/29/2023 8 AM 78 Moderate Legacy Road 12/29/2023 8 AM 73 Moderate Moffett and Tustin Ranch 12/29/2023 8 AM 90 Moderate OC Animal Shelter 12/29/2023 8 AM 80 Moderate Valencia and Armstrong 12/29/2023 7 AM 68 Moderate Valencia and Columbus Square 12/29/2023 8 AM 57 Moderate Valencia and Legacy 12/29/2023 8 AM 46 Good Victory and Tustin Ranch Rd. 12/29/2023 8 AM 69 Moderate Warner and Armstrong 12/29/2023 8 AM 41 Good Warner Avenue --F7 12/29/2023 8 AM 75 Moderate Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health effects is ' d for everyone. 425 to 504 Health warning of - •- more conditions: • - is likely • be affected. Saturday, December 30, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/30/2023 8 AM Matter 38 Level of Concern Good Fire Station 37 12/30/2023 8 AM 39 Good Hangar Fenceline - E Side 12/30/2023 8 AM 36 Good Hangar Fenceline - N Center 12/30/2023 8 AM 47 Good Hangar Fenceline - N Corner 12/30/2023 8 AM 42 Good Hangar Fenceline - NE Corner 12/30/2023 8 AM 41 Good Hangar Fenceline - NE Side 12/30/2023 8 AM 48 Good Hangar Fenceline - S Corner 12/30/2023 8 AM 38 Good Hangar Fenceline - S Side 12/30/2023 8 AM 43 Good Hangar Fenceline - SW Corner 12/30/2023 8 AM 41 Good Hangar Fenceline - SW Side 12/30/2023 8 AM 45 Good Hangar Fenceline - W Side 12/30/2023 8 AM 40 Good Heritage Elementary 12/30/2023 8 AM 44 Good Legacy Academy 12/30/2023 8 AM 46 Good Legacy Road 12/30/2023 8 AM 49 Good Moffett and Tustin Ranch 12/30/2023 8 AM 53 Good OC Animal Shelter 12/30/2023 8 AM 47 Good Valencia and Armstrong 12/30/2023 7 AM 38 Good Valencia and Columbus Square 12/30/2023 8 AM 36 Good Valencia and Legacy 12/30/2023 8 AM 28 Good Victory and Tustin Ranch Rd. 12/30/2023 8 AM 44 Good Warner and Armstrong 12/30/2023 8 AM 26 Good Warner Avenue 12/30/2023 8 AM 44 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected. Sunday, December 31, 2023 North Hangar Fire Incident I City of Tustin Air Quality Updates: Particulate Matter Air monitoring and sampling locations have been set up around the perimeter of the hangar and in surrounding communities to provide real-time information on Particulate Matter (PM) in the air. While the units are in place, an average reading for the last 24 hours will be provided for the public's reference. Any questions regarding these numbers should be directed to the call center at 714-426-2444. Monitoring Air Quality for Sensitive Individuals The Incident Management Team Environmental Group is monitoring the air quality around the incident for any readings above 154 micrograms per cubic meter (ug/m3), which may cause individuals in sensitive groups to experience health effects. This is a moderate threshold that is less likely to affect the general public. What is Particulate Matter? "Particulate matter," also known as particle pollution or PM, is a complex mixture of extremely small particles and liquid droplets that exists in the environment including pollen, dust, and soil. Typical particulate matter for the area ranges from 3 to 67 ug/m3. The concentration range is based on sampling results collected by South Coast AQMD in Anaheim, CA, which was the closest available dataset in proximity to the site. For more information about air quality and monitoring, visit the AirNow website at www.airnow.gov. Good Moderate Unhealthy for �nhealthy Very Unhealthy • • (0 to 54) (55 to 154) Sensitive Groups (255 to 354) (355 to 424) (425-504) EL(155 to 254) See below for further category descriptions. ** Data gap due to instrument malfunction, instrument replaced. Location Columbus Square Park 24-Hour Period Ending 12/31/2023 8 AM Matter 7 Level of Concern Good Fire Station 37 12/31/2023 8 AM 7 Good Hangar Fenceline - E Side 12/31/2023 8 AM 8 Good Hangar Fenceline - N Center 12/31/2023 8 AM 10 Good Hangar Fenceline - N Corner 12/31/2023 8 AM 9 Good Hangar Fenceline - NE Corner 12/31/2023 8 AM 7 Good Hangar Fenceline - NE Side 12/31/2023 8 AM 13 Good Hangar Fenceline - S Corner 12/31/2023 8 AM 8 Good Hangar Fenceline - S Side 12/31/2023 8 AM 10 Good Hangar Fenceline - SW Corner 12/31/2023 8 AM 9 Good Hangar Fenceline - SW Side 12/31/2023 8 AM 11 Good Hangar Fenceline - W Side 12/31/2023 8 AM 8 Good Heritage Elementary 12/31/2023 8 AM 8 Good Legacy Academy 12/31/2023 8 AM 9 Good Legacy Road 12/31/2023 8 AM 10 Good Moffett and Tustin Ranch 12/31/2023 8 AM 13 Good OC Animal Shelter 12/31/2023 8 AM 10 Good Valencia and Armstrong 12/31/2023 8 AM 8 Good Valencia and Columbus Square 12/31/2023 8 AM 6 Good Valencia and Legacy 12/31/2023 8 AM 5 Good Victory and Tustin Ranch Rd. 12/31/2023 8 AM 11 Good Warner and Armstrong 12/31/2023 7 AM 3 Good Warner Avenue 12/31/2023 8 AM 11 Good Category Descriptions Color Green Good 0 to 54 Air quality is satisfactory, and air pollution poses little or no risk. Yellow Moderate 55 to 154 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Orange Unhealthy for Sensitive 155 to 254 Members of sensitive groups may Groups experience health effects. The general public is less likely to be affected. Red Unhealthy 255 to 354 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Purple Very Unhealthy 355 to 424 Health alert: The risk of health eryone. 425 to 04 Health warning. emergency more conditions: everyone is likely ..- affected.