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Ozone Areas
Abstract This data layer identifies areas in the U.S. where air pollution levels have not met the National Ambient Air Quality Standards (NAAQS) for at least one of the Criteria... -
Nonattainment Area - Nitrogen Dioxide (NO2 - 1971 Standard)
The Nonattainment Area - Nitrogen Dioxide (NO2-1971) dataset was updated on June 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of... -
Nonattainment Area - Particulate Matter - 2.5 Annual (2012 Standard)
The Nonattainment Area - Particulate Matter-2.5 (2012) dataset was updated on June 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of... -
Nonattainment Area - Particulate Matter - 2.5 Annual (1997 Standard)
The Nonattainment Area - Particulate Matter-2.5 Annual (1997) dataset was updated on June 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S.... -
Nonattainment Area - 1 hr Ozone (1979 Standard-Revoked)
The Nonattainment Area - 1 hr Ozone (1979) dataset was updated on June 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation... -
Nonattainment Area - 8 hr Ozone (2008 Standard)
The Nonattainment Area - 8 hr ozone (2008) dataset was updated on June 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation...