Description: Particulate matter (under 10 microns) nonattainment areas in Arizona as of July 2017The U.S. National Ambient Air Quality Standards are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards. Established by the United States Environmental Protection Agency under authority of the Clean Air Act, NAAQS is applied for outdoor air throughout the country
Description: Particulate matter (under 10 microns) maintenance areas in Arizona as of July 2017The U.S. National Ambient Air Quality Standards are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards. Established by the United States Environmental Protection Agency under authority of the Clean Air Act, NAAQS is applied for outdoor air throughout the country.