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

الملخص

On February 24, 2009, the State of Arkansas, through the Arkansas Department of Environmental Quality (ADEQ), submitted a request to redesignate the Arkansas portion of the bi-state Memphis, Tennessee-Arkansas (Memphis TN-AR) 1997 8-hour ozone nonattainment area to attainment for the 8-hour ozone National Ambient Air Quality Standard (NAAQS); and to approve the State Implementation Plan (SIP) revision containing a maintenance plan for the Arkansas portion of the bi-state Memphis TN-AR Area. The bi-state Memphis TN-AR 1997 8-hour ozone nonattainment area is composed of Memphis, Shelby County, Tennessee (Shelby County) and Crittenden County, Arkansas. In this action, EPA proposes to approve the 1997 8-hour ozone redesignation request for Crittenden County, Arkansas. Additionally, EPA proposes to approve the 1997 8-hour ozone maintenance plan for Crittenden County, including the state motor vehicle emissions budgets (MVEBs) for nitrogen oxides (NO X ) and volatile organic compounds (VOCs) for the years 2006 and 2021. This proposed approval of Arkansas' redesignation request is based on EPA's determination that Arkansas has demonstrated that Crittenden County has met the criteria for r