Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Ohio; Redesignation of the Columbus Area to Attainment for Ozone

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EPA is taking several related actions affecting the Columbus, Ohio 1997 8-hour ozone nonattainment area. EPA is making a determination under the Clean Air Act (CAA) that the Columbus area has attained the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS). The Columbus area includes Delaware, Fairfield, Franklin, Knox, Licking, and Madison Counties. This determination is based on quality-assured ambient air quality monitoring data for the 2006-2008 ozone seasons that demonstrate that the 8-hour ozone NAAQS has been attained in the area. Preliminary 2009 air quality data show that the area continues to attain the 8-hour ozone standard. EPA is approving, as a revision to the Ohio State Implementation Plan (SIP), the state's plan for maintaining the 8-hour ozone NAAQS through 2020 in the area. EPA is approving a request from the state of Ohio to redesignate the Columbus area to attainment of the 8-hour ozone NAAQS. EPA is approving the 2002 base year emissions inventory for the Columbus area as meeting the requirements of the CAA. Finally, EPA finds adequate and is approving the state's 2012 and 2020 volatile organic compound (VOC) and oxides of nitrogen (NO X ) Motor Veh