The Environmental Protection Agency (EPA) is approving, in part, and disapproving, in part, changes to the North Carolina State Implementation Plan (SIP), provided by the North Carolina Department of Environmental Quality (NC DEQ) through the Division of Air Quality (DAQ), to EPA in submittals dated May 16, 2011, (two separate submittals) and September 5, 2013. These SIP submittals modify North Carolina's New Source Review (NSR)--Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NNSR)-- permitting regulations and include the adoption of some federal requirements regarding implementation of the fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS) through the NSR permitting program. As a result of the disapproval of a portion of the State's NSR requirements, EPA is also approving, in part, and disapproving, in part, the PSD elements of North Carolina's infrastructure SIP submittals for the 2008 lead, 2008 8-hour ozone, 2010 sulfur dioxide (SO<INF>2</INF>), 2010 nitrogen dioxide (NO<INF>2</INF>) and the 2012 PM<INF>2.5</INF> NAAQS, and converting the Agency's previous conditional approvals of the PSD elements of North Carolina's infrastructure SIP submittals for the 1997 Annual PM<INF>2.5</INF> and 2006 24-hour PM<INF>2.5</INF> NAAQS to partial approvals and partial disapprovals. This partial disapproval triggers the requirement for EPA to promulgate a Federal Implementation Plan (FIP) no later than two years from the date of the disapproval unless the State corrects the deficiencies through a SIP revision and EPA approves the SIP revision before EPA promulgates such a FIP.