Approval and Promulgation of Implementation Plans and Designations of Areas for Air Quality Planning Purposes; North Carolina: Redesignation of Great Smoky Mountains National Park 1997 8-Hour Ozone Nonattainment Area to Attainment

Résumé

The State of North Carolina through the North Carolina Department of Environment and Natural Resources, Division of Air Quality (NC DAQ) submitted, on July 24, 2009, a request to redesignate the Great Smoky Mountains National Park (GSMNP) 1997 8-hour ozone nonattainment area to attainment for the 1997 8-hour ozone national ambient air quality standards (NAAQS); and to approve a State Implementation Plan (SIP) revision containing a maintenance plan with a 2020 end year for the GSMNP Area. The GSMNP Area is composed of portions of Haywood and Swain Counties in North Carolina. In this action, EPA is proposing to approve the 1997 8-hour ozone redesignation request for the GSMNP Area. Additionally, EPA is proposing to approve the emission inventory and the 1997 8-hour ozone maintenance plan for the GSMNP Area, including motor vehicle emission budgets (MVEBs) for nitrogen oxides (NO X ) and an insignificance determination for conformity for volatile organic compounds (VOC) emissions from motor vehicles. Further, in this action, EPA is also describing the status of its transportation conformity adequacy determination for the new 2011 and 2020 MVEBs for NO X , and for the insignificance de