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AirNow Monitors
Temporary Monitors
Hazard Mapping System Fire Locations Icon Hazard Mapping System Fire Locations

Air Quality Index Levels of Health Concern Numerical
Value
Meaning
Good 0 to 50 Air quality is considered satisfactory, and air pollution poses little or no risk.
Moderate 51 to 100 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups 101 to 150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy 151 to 200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy 201 to 300 Health alert: everyone may experience more serious health effects.
Hazardous 301 to 500 Health warnings of emergency conditions. The entire population is more likely to be affected.

Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the "Hazardous category." Additional information on reducing exposure to extremely high levels of particle pollution is available here.

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Explanation of Map Layers
  • Latest PM2.5 AQI from Temporary Monitors shows particle pollution observed at portable, temporary PM2.5 monitors near large, active wildfires. These monitors are deployed by US Forest Service and state and local agencies for measuring air quality during wildfires. They may be moved based on wildfire locations. Data are not fully verified and only intended for real-time air quality reporting.
  • Latest PM2.5 AQI from AirNow Monitors shows particle pollution observed at monitors operated by state, tribal, or local monitoring agencies using federal reference or equivalent monitoring techniques. Data are considered preliminary and non-regulatory.
  • Incident Information System (InciWeb) shows the locations of active wildfires from the InciWeb website. Chrome and Firefox only.
  • Hazard Mapping System Fire Locations are fire locations detected by satellites operated by the National Oceanic and Atmospheric Administration (NOAA) Hazard Mapping System.
  • Hazard Mapping System Smoke Plumes are smoke plumes analyzed by the National Oceanic and Atmospheric Administration (NOAA) Hazard Mapping System. Darker colors indicate denser smoke concentrations. The plumes may be at ground-level or high up in the atmosphere.
Map layer information
  • Hazard Mapping System Fire Locations was last updated on ....
  • Hazard Mapping System Smoke Plumes was last updated on ....
  • The initial HMS product for the current day is created and updated by a satellite analyst roughly between 8am and 10am Eastern Time. After 10am, the analysis is fine-tuned as time permits as additional satellite data becomes available. Areas of smoke are analyzed and added to the analysis during daylight hours as visible satellite imagery becomes available. The product is finalized and "completed" for the archive the following morning - generally by around 8am.

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