EPA Revises Air Quality Standards

Remanded designations are now more uniform with changes to counties in Illinois, Indiana, Missouri and Wisconsin.

June 15, 2021

American Flag waving by Capitol Building

WASHINGTON—The Environmental Protection Agency has revised the initial air quality designations for 14 counties associated with seven nonattainment areas for the 2015 primary and secondary National Ambient Air Quality Standards (NAAQS) for ozone.

In a July 10, 2020, decision, the District of Columbia Circuit Court remanded to the EPA but did not vacate the April 30, 2018, designations for 16 counties associated with nine nonattainment areas.

In response, the EPA has re-evaluated the designations for the remanded counties by applying a uniform, nationwide analytical approach and interpretation of the designation provisions of the Clean Air Act (CAA) in considering the specific facts and circumstances of the areas using only data and information available at the time of the original designations.

In this final action, the EPA revises the designations and/or boundaries of 13 counties associated with six nonattainment areas in four states (Illinois, Indiana, Missouri and Wisconsin) and is affirming the April 30, 2018, designation of one county associated with a nonattainment area in Michigan. The EPA is addressing the two additional remanded counties associated with two nonattainment areas in a separate Federal Register document. The rule goes into effect within 30 days.

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