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National Ambient Air Quality Standards (NAAQS):

National standards set by the Environmental Protection Agency under authority of the Clean Air Act; NAAQS define the maximum allowable concentrations of specified air pollutants in outdoor (ambient) air. NAAQS have been set for carbon monoxide, particulate matter, sulfur oxides, nitrogen dioxide, lead, and ozone. "Primary" NAAQS protect human health, with a margin of safety; "secondary" NAAQS protect human welfare, which includes effects on soils, water, crops, vegetation, materials, etc.

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Information and definitions of the terms been taken from various reliable government publications and we have done our best to verify their accuracy. If you feel any of the definitions are incorrect or needs to be updated please contact us and we will look into it.



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