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The EPA promulgated initial air quality designations for the 2015 ozone National Ambient Air Quality Standards (NAAQS) for all areas of the country in three actions. As part of the second action, promulgated on April 30, 2018, EPA designated 51 nonattainment areas. Subsequently, multiple petitioners filed six petitions for review of that designations action. Collectively, the petitioners challenged the designations of 17 counties associated with nine nonattainment areas, including nearby counties that EPA designated as attainment. On July 10, 2020, the court issued its decision remanding without vacatur all but one of the challenged counties to EPA for further consideration. Therefore, the affected designations remain in place pending the outcome of EPA's response to the court remand.