Nonattainment Area:
A Nonattainment Area is a region in which the level of a Criteria Air Pollutant is higher than allowed by the federal NAAQS. For ground-level ozone, the one-hour standard is 120 parts per billion. EPA puts a city or metropolitan area on its "nonattainment" list when ozone exceeds, or violates, the standard more than once a year averaged over a three-year period.
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| National Ambient Air Quality Standards (NAAQS): | ■■■■■■■■ |
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| Primary NAAQS | ■■■■■■■ |
Primary NAAQS: Primary National Ambient Air Quality Standards (NAAQS) in the environmental context refer . . . Read More | |
| Clean Air Act | ■■■■■■■ |
The Clean Air Act gives EPA authority to set standards for air quality and to control the Release of . . . Read More | |
| Criteria Pollutants | ■■■■■■■ |
Criteria Pollutants are the 1970 amendments to the Clean Air Act required EPA to set National Ambient . . . Read More | |
| Average | ■■■■■■■ |
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| Air Toxics | ■■■■■■ |
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| Secondary NAAQS | ■■■■■■ |
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| Criteria pollutant | ■■■■■■ |
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| Criteria | ■■■■■■ |
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| Area and other sources: | ■■■■■■ |
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