Air Plan Approval and Air Quality Designation; TN; Reasonably Available Control Measures and Redesignation for the TN Portion of the Chattanooga 1997 Annual PM2.5

The Environmental Protection Agency (EPA) is approving the portion of a State Implementation Plan (SIP) revision submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), on October 15, 2009, that addresses reasonably available control measures (RACM), including reasonably available control technology (RACT), for the Tennessee portion of the Chattanooga, TN-GA-AL nonattainment area for the 1997 fine particulate matter (PM2.5) national ambient air quality standards (NAAQS) (hereinafter referred to as the ``Chattanooga TN-GA-AL Area'' or ``Area''). Additionally, EPA is taking three separate final actions related to Tennessee's November 13, 2014 request to redesignate the Tennessee portion of the Area to attainment for the 1997 PM2.5 NAAQS and associated SIP revision containing a plan for maintaining attainment of the standard in the Chattanooga TN-GA-AL Area. In these three actions, EPA is determining that the Area is continuing to attain the 1997 PM2.5 NAAQS; approving and incorporating the State's plan for maintaining attainment of the standard in the Area, including the 2025 motor vehicle emission budgets (MVEBs) for nitrogen oxides (NOX) and PM2.5 for the Tennessee portion of this Area, into the SIP; and redesignating the Tennessee portion of the Area to attainment for the 1997 PM2.5 NAAQS. In addition to the four final actions described above, EPA is also finding the 2025 MVEBs for the Tennessee portion of the Area adequate for the purposes of transportation conformity.