Air Quality Criteria
The relationship between the level of exposure to air pollutant concentrations and the adverse effects on health or public welfare associated with such exposure. Air quality crite...
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National Ambient Air Quality Standard
The key to national air pollution control policy since the passage of the Clean Air Act amendments of 1970 are the National Ambient Air Quality Standards (NAAQS...
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Nonattainment Area
Any locality found to be in violation of one or more National Ambient Air Quality Standards set by the Environmental Protection Agency (EPA) under the provisions of the Clean Air Ac...
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Air Quality Criteria