EPA is approving revisions to the North Carolina State Implementation Plan (SIP) submitted by the State of North Carolina, through the North Carolina Department of Environmental and Natural Resources on August 7, 2006. These revisions incorporate provisions related to the implementation of EPA's Clean Air Interstate Rule (CAIR), promulgated on May 12, 2005, and subsequently revised on April 28, 2006, and December 13, 2006, and the CAIR Federal Implementation Plan (FIP) concerning sulfur dioxide (SO<INF>2</INF>), nitrogen oxides (NO<INF>X</INF>) annual, and NO<INF>X</INF> ozone season emissions for the State of North Carolina, promulgated on April 28, 2006, and subsequently revised December 13, 2006. EPA is not making any changes to the CAIR FIP, but is amending, to the extent EPA approves North Carolina's SIP revisions, the appropriate appendices in the CAIR FIP trading rules simply to note that approval. On July 3, 2007, North Carolina requested that EPA only act on a portion of the August 7, 2006, submittal as an abbreviated SIP. Consequently, EPA is approving the abbreviated SIP revisions that address the methodology to be used to allocate annual and ozone season NO<INF>X</INF> allowances to existing and new units under the CAIR FIPs and CAIR FIP opt-in provisions.