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The air quality provisions of the Clean Air Act as amended establish restrictions on emission reductions from transportation sources. While Moving Ahead for Progress in the 21st Century Act (MAP-21) is the active transportation legislation providing authorizations for the Federal-aid Highway Program (FAHP) and is codified in Title 23 of the United States Code. The other links provide access to the National Ambient Air Quality Standards (NAAQS) for the criteria pollutants as required by the Clean Air Act, the American Recovery and Reinvestment Act of 2009 and the National Environmental Policy Act (NEPA).

Updated: 07/29/2014
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