EPA is approving a revision to the Ohio State Implementation Plan (SIP) that would address the requirements of EPA's Clean Air Interstate Rule (CAIR). EPA previously approved an "abbreviated SIP" for Ohio, primarily consisting of rules governing allocation of allowances to electric generating units (EGUs) for use in the trading programs established pursuant to CAIR and providing for voluntary opt- in to these programs. The abbreviated SIP was implemented in conjunction with a Federal Implementation Plan (FIP) that specified requirements for emissions monitoring, permit provisions, and other elements of the CAIR programs. EPA is now approving the addition of non-EGUs to the CAIR Nitrogen Oxides (NO<INF>X</INF>) Ozone Season Trading Program, and EPA is issuing a "full SIP" approval under which the various CAIR implementation provisions would be governed by State rules rather than FIP rules. This rulemaking addresses rules Ohio submitted on July 15, 2009, and August 13, 2009. This action also causes the CAIR Federal Implementation Plans (CAIR FIPs) concerning sulfur dioxides (SO<INF>2</INF>), NO<INF>X</INF> annual, and NO<INF>X</INF> ozone season emissions by Ohio sources to be automatically withdrawn.