Approval and Promulgation of Air Quality Implementation Plans; Oklahoma; Attainment Demonstration for the Central Oklahoma Early Action Compact Area

The EPA is approving a revision to the Oklahoma State Implementation Plan (SIP) submitted by the Secretary of the Environment on December 22, 2004 for Central Oklahoma. This revision will incorporate a Memorandum of Agreement (MOA) between the Oklahoma Department of Environmental Quality (ODEQ) and the Association of Central Oklahoma Governments (ACOG) into the Oklahoma SIP and includes a demonstration of attainment and maintenance for the 8-hour National Ambient Air Quality Standard (NAAQS) for ozone. The MOA outlines duties and responsibilities of each party for implementation of pollution control measures for the Central Oklahoma Early Action Compact (EAC) area. EPA is approving the photochemical modeling in support of the attainment demonstration for the 8-hour ozone standard within the Central Oklahoma EAC area and is approving the associated control measures. These actions strengthen the SIP in accordance with the requirements of sections 110 and 116 of the Federal Clean Air Act (the Act) and will result in emission reductions needed to help ensure attainment and maintenance of the 8-hour NAAQS for ozone.