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Air Quality Improvement Programs

Pollutants are generated by a wide variety of sources, including emissions.  The Clean Air Act Amendments of 1990 required a reduction in the amount of allowable vehicle tailpipe emissions, initiated more stringent control measures in areas that still failed to meet the federal National Ambient Air Quality Standards (NAAQS) -- known as non-attainment areas, and provided for a stronger, more rigorous link between transportation and air quality planning.

In coordination with the Federal Highway Administration, TDOT provides several programs and resources to assist local communities in air quality improvement. These programs include:

For more information, please contact TDOT Senior Air Quality Planner Tom Doherty by phone at (615) 253-3068 or by email at