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.

		0-50 Air quality is satisfactory, and air pollution poses little or no risk with 24 hours of exposure.
		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.
		101-150 Members of sensitive groups may experience health effects with 24 hours of exposure. The general public is less likely to be affected.
		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.
		201-300 Health alert: The risk of health effects is increased for everyone with 24 hours of exposure.
		301 and Higher Higher Health warning of emergency conditions: everyone is more likely to be affected with 24 hours of exposure.