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What is the Air Quality Index (AQI)?

  • Updated

The EPA and your State environmental agency measure pollution in the air and use the Air Quality Index, or AQI, to report how good or bad the air is.

Color dots go from Green to Yellow to Orange to Red to Purple to Maroon and number range from 0 to 500.

The Air Quality Index (AQI) mapping layer can be toggled on and off by tapping on the Layers button from the map and scrolling to the Weather section.

To turn on or off this layer, tap the Layers button and tap Air Quality Index.

Watch-Duty-AQI.png aqi-green.png 0-50
Air quality is satisfactory, and air pollution poses little or no risk with 24 hours of exposure.
aqi-yellow.png 51-100
Air quality is acceptable. However, there may be a risk for some people with 24 hours of exposure, particularly those who are unusually sensitive to air pollution.
aqi-orange.png 101-150
Members of sensitive groups may experience health effects with 24 hours of exposure. The general public is less likely to be affected.
aqi-red.png 151-200
Some members of the general public may experience health effects with 24 hours of exposure; members of sensitive groups may experience more serious health effects.
aqi-purple.png 201-300
Health alert: The risk of health effects is increased for everyone with 24 hours of exposure.
aqi-maroon.png 301 and Higher
Higher Health warning of emergency conditions: everyone is more likely to be affected with 24 hours of exposure.

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