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  • (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.
  • (NAAQS) Sets the levels of air quality for the United States, in the Code of Federal Regulations (40 CFR §50.2), to protect the population's health. These are the minimum and might be more stringent from state to state. Source: Atmospheric Chemistry Glossary