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OPINION ONLY
[Temporary: while site is under construction] National Ambient Air Quality Standards
(NAAQS of the Clean Air Act of the EPA)
Some key documents
1970: National Ambient Air Quality Standards (NAAQS)
After the Clean Air Act of 1970 was enacted, the Environmental Protection Agency (EPA) established air quality standards for six air criteria pollutants: - ozone (the principle ingredient of smog),
- carbon monoxide,
- sulfur dioxide,
- nitrogen dioxide,
- lead and
- particulate matter.
The act requires EPA to review and revise standards every five years, although the agency failed to do so for ozone, and [in 1993] is currently under a court-ordered deadline.
The act directs states and localities to monitor their air to determine if air quality meets the standards, and to implement source reduction plans in non-attainment areas. [Source 1993 Annual Report of the EPA's division on Air Program]  
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