AQI: Good (0 - 50) AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.
AQI: Moderate (51 - 100) AQI: Moderate (51 - 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.
AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.
AQI: Unhealthy (151 - 200) AQI: Unhealthy (151 - 200)
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
AQI:Very Unhealthy (201 - 300) AQI: Very Unhealthy (201 - 300)
Health alert: everyone may experience more serious health effects.
AQI: Hazardous(301 - 500) AQI: Hazardous (301 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.
Action DayAction Day
Highest 5:
About the Highest 5
 
  • Current AQI
  • Today's Forecasts
  • Tomorrow's Forecasts

Updates for current conditions are not available between midnight and 4 am EST.

Auburn, CA
108
 
Colfax, CA
108
 
Lincoln, CA
108
 
Roseville-Rocklin, CA
108
 
Cool, CA
105
 
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.
Fires: Current Conditions
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Embassies & Consulates U.S. Embassies and Consulates
Data from air quality monitors at select U.S. embassies and consulates around the world

Announcements

5/21/19: Smoke from outside can enter your home and affect the indoor air quality. EPA’s new web site Wildfires and Indoor Air Quality can help you learn how smoke enters your home and what you can do about it. You can also learn how to create a clean room in your home.