The Environmental Protection Agency (EPA) is approving revisions to Ohio's particulate matter rules into the Ohio State Implementation Plan (SIP) under the Clean Air Act (CAA). The revisions to Ohio's particulate matter rules remove provisions for facilities or emissions units that have permanently shut down, update facility names and addresses, and make nonsubstantive revisions to the language of the rules. EPA proposed to approve this action on April 15, 2024, and received two comments.