The Environmental Protection Agency (EPA) is taking direct final action to approve the State Implementation Plan (SIP) revision submitted by the State of North Carolina, through the North Carolina Department of Environment and Natural Resources on August 13, 2012, pertaining to definition changes for the Nitrogen Dioxide (NO<INF>2</INF>) and Sulfur Dioxide (SO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). EPA is approving this SIP revision because the State has demonstrated that it is consistent with the Clean Air Act (CAA or Act).