The Environmental Protection Agency (EPA) is approving revisions to the Ohio State Implementation Plan (SIP) submitted by the Ohio Environmental Protection Agency (Ohio EPA) on November 4, 2024. Ohio EPA requested that EPA approve the revised rules for nitrogen oxide standards in the Ohio Administrative Code (OAC) into Ohio's SIP. The revised rules include non-substantive updates to rule language and updates to referenced material. The revisions will assist with Ohio's efforts to attain and maintain the National Ambient Air Quality Standards (NAAQS) for nitrogen dioxide (NO<INF>2</INF>).