An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Ozone Designations

Partial Designations for the 2015 Ozone Standards

EPA is taking the next step in the Clean Air Act process to implement the national air quality standards for ozone set in 2015.  The Agency finds that most areas in the country meet the standards and is designating these areas “attainment/unclassifiable.”

Notice:  Air Quality Designations for the 2015 Ozone National Ambient Air Quality Standards

See other area designations for the 2015 Ozone Standards

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.