Pursuant to the Clean Air Act (CAA), the Environmental Protection Agency (EPA) is approving as a revision to the Ohio State Implementation Plan (SIP), the State's plan for maintaining the 1997 ozone National Ambient Air Quality Standard (NAAQS or standard) through 2028. On April 12, 2019, the Ohio Environmental Protection Agency submitted the 1997 ozone NAAQS Limited Maintenance Plan (LMP) for the Canton-Massillon (Stark County), Lima (Allen County), and Toledo (Lucas and Wood Counties) areas and the Ohio portion of the Parkersburg- Marietta [OH-WV] (Washington County), Steubenville-Weirton [OH-WV] (Jefferson County), Wheeling [OH-WV] (Belmont County), and Youngstown- Warren-Sharon [OH-PA] (Columbiana, Mahoning, and Trumbull Counties) multi-state areas. The effect of this action makes certain commitments related to maintenance of the 1997 ozone NAAQS in these areas federally enforceable as part of the Ohio SIP.