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This action will respond to a Clean Air Act section 126(b) petition from the state of New York dated March 12, 2018. The petition requests a finding from EPA that emissions from numerous sources in nine states (Illinois, Indiana, Kentucky, Maryland, Michigan, Ohio, Pennsylvania, Virginia and West Virginia) significantly contribute to nonattainment and interfere with maintenance of the 2008 and 2015 ozone national ambient air quality standards in New York State. EPA previously denied the petition in 2019. Petitioners challenged the denial and on July 14, 2020, the D.C. Circuit vacated and remanded EPA's denial. This action addresses the Court's vacatur and remand and provides a revised response to the petition.