Air Quality Designations for Ozone

Remand Response

The Clean Air Act requires EPA to designate areas in the United States after the agency sets a new National Ambient Air Quality Standard (NAAQS) or revises an existing standard

November 17, 2021 - EPA completes response to remand issued by the DC Circuit Court on certain area designations for the 2015 ozone standards.

This web site provides information on the process EPA, the states, and the tribes follow to designate areas as "attainment" (meeting) or "nonattainment" (not meeting) the ground-level ozone standards EPA strengthened in 2015.

Learn About Ozone Designations

Ozone designations process
Basis for air quality designations

Regulatory Actions and Guidance for the 2015 Ozone Designations

Regulatory actions
Designations guidance and data

Where You Live

State designations
Tribal designations
Learn about your local ozone levels

Air Quality Designations for Ozone

Remand Response

Learn About Ozone Designations

Regulatory Actions and Guidance for the 2015 Ozone Designations

Where You Live

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