Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Tennessee; Redesignation of the Shelby County, Tennessee Portion of the Memphis, TN-Arkansas 1997 8-Hour Ozone Nonattainment Area to Attainment

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EPA is taking final action to approve a request submitted on February 26, 2009, from the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), Air Pollution Control Division, to redesignate the Tennessee portion of the bi-state Memphis, Tennessee-Arkansas 8-hour ozone nonattainment area (hereafter referred to as the "bi-state Memphis Area") to attainment for the 1997 8-hour ozone national ambient air quality standards (NAAQS). The bi-state Memphis 1997 8-hour ozone NAAQS nonattainment area is composed of Shelby County, Tennessee and Crittenden County, Arkansas. EPA's approval of the redesignation request is based on the determination that the bi-state Memphis Area has met the criteria for redesignation to attainment set forth in the Clean Air Act (CAA), including the determination that the bi-state Memphis Area has attained the 1997 8- hour ozone standard. Additionally, EPA is approving a revision to the Tennessee State Implementation Plan (SIP) including the 1997 8-hour ozone maintenance plan for Shelby County, Tennessee that contains the new 2006, 2009, 2017, and 2021 motor vehicle emission budgets (MVEBs) for nitrogen oxides (NO X ) and vol