Under the Clean Air Act, the Environmental Protection Agency is required to establish a nationally uniform air quality index for reporting air quality. Local newspapers publish the Air Quality Index (AQI) daily. The AQI uses a color-coded system to indicate air quality conditions. The AQI lets you know when it's safe for you or your children to be outside and exercising.

Click below to look at the Air Quality Index chart:
http://www.vcapcd.org/aqindex.htm