Approval and Promulgation of Implementation Plans; Mississippi; Memphis, TN-MS-AR Emissions Inventory for the 2008 8-Hour Ozone Standard

The Environmental Protection Agency (EPA) is taking direct final action to approve the portion of the state implementation plan (SIP) revision submitted by the State of Mississippi, through the Mississippi Department of Environmental Quality (MDEQ) on January 14, 2015, that addresses the base year emissions inventory requirements for the State's portion of the Memphis, Tennessee-Mississippi-Arkansas (Memphis, TN-MS-AR) 2008 8-hour ozone national ambient air quality standards (NAAQS) nonattainment area (hereafter referred to as the "Memphis, TN-MS-AR Area" or "Area"). A base year emissions inventory is required for all ozone nonattainment areas. The Area is comprised of Shelby County in Tennessee, Crittenden County in Arkansas, and a portion of DeSoto County in Mississippi. EPA will take action on the emissions inventories for the Tennessee and Arkansas portions of the Area in separate actions.