Nonattainment Areas for Criteria Pollutants (Green Book)
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Areas of the country that meet or violate air quality standards
Green Book - current as of April 30, 2025
Federal Register Notices published or effective since this Green Book was posted
The EPA Green Book provides detailed information about area National Ambient Air Quality Standards (NAAQS) designations, classifications and nonattainment status. Information is current as of the Green Book posted date and is available in reports, maps and data downloads.
Select one of the NAAQS below to view information about designated nonattainment areas.
Ozone
Particulate Matter (PM)
Sulfur Dioxide
Carbon Monoxide
Nitrogen Dioxide
National Multi-Pollutant
Green Book Website Disclaimer
What's New
New features in this Green Book:
- At the top of each NAAQS page is "All Designated Area Selections" with reports that combine nonattainment and maintenance information.
- Interactive maps are available from each NAAQS page with current status information.
- A "Downloads" link provides access to data exports, GIS shapefiles, and sets of Green Book maps.