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

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On February 26, 2009, the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), Air Pollution Control Division, submitted a request to redesignate the Tennessee portion of the bi-State Memphis, Tennessee-Arkansas 8-hour ozone nonattainment area (the "bi-State Memphis Area") to attainment for the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS); and to approve the State Implementation Plan (SIP) revision containing a maintenance plan for the Tennessee portion of the bi-State Memphis Area. The bi-State Memphis 1997 8-hour ozone NAAQS nonattainment area is composed of Shelby County, Tennessee and Crittenden County, Arkansas. In this action, EPA is proposing to approve the February 26, 2009 redesignation request for Shelby County, Tennessee as part of the Memphis Area. Additionally, EPA is proposing to approve the 1997 8-hour ozone NAAQS maintenance plan for Shelby County, including the emissions inventory and the State motor vehicle emission budgets (MVEBs) for nitrogen oxides (NO X ) and volatile organic compounds (VOC) for the years 2006, 2009, 2017, and 2021. This proposed approval of Tennessee's redesignation request is based o