Air Plan Approval; Ohio; 2015 Ozone Moderate Reasonably Available Control Technology

The Environmental Protection Agency (EPA) is approving revisions to Ohio Administrative Code (OAC) Chapters 3745-21 and 3745- 110 into the Ohio State Implementation Plan (SIP). The Ohio Environmental Protection Agency ("Ohio" or "Ohio EPA") submitted these revisions on March 30, 2022, and supplemented the submittal on February 1, 2023, and August 28, 2023. The EPA is approving parts of OAC Chapters 3745-21 and 3745-110 as satisfying some of the Moderate Volatile Organic Compound (VOC) Reasonably Available Control Technology (RACT) and Nitrogen Oxide (NO<INF>X</INF>) RACT requirements for the Cleveland, OH nonattainment area (Cuyahoga, Geauga, Lake, Lorain, Medina, Portage, and Summit counties) under the 2015 ozone National Ambient Air Quality Standard ("NAAQS" or "standard") and as SIP strengthening for Ashtabula County and the Ohio portion of the Cincinnati, OH-KY maintenance area (Butler, Clermont, Hamilton, and Warren counties). The EPA is also approving Table (M)(1) in OAC rule 3745-21-07 into the SIP, with the exception of the row for The Ruscoe Company. Finally, the EPA is approving OAC rule 3745-15-03, submitted by Ohio on February 9, 2023, and supplemented on December 1, 2023, and December 30, 2024. The EPA proposed to approve this action on August 28, 2025 and received two comments.