EPA is taking final action to approve revisions to the North Carolina State Implementation Plan (SIP) submitted by the State of North Carolina in three submittals dated November 30, 2005, March 16, 2007, and June 20, 2008. The revisions modify North Carolina's Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NNSR) permitting regulations in the SIP to address changes to the federal New Source Review (NSR) regulations, which were promulgated by EPA on December 31, 2002, and reconsidered with minor changes on November 7, 2003 (collectively, these two final actions are referred to as the "2002 NSR Reform Rules"). In addition, the revisions address an update to the NSR regulations promulgated by EPA on November 29, 2005 (hereafter referred to as the Ozone Implementation NSR Update) relating to the implementation of the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS). EPA proposed to approve these revisions on September 9, 2008, and received adverse comments. In this final action, EPA is also responding to the adverse comments.