The Environmental Protection Agency (EPA) is taking final action to approve the portions of a revision to the North Carolina State Implementation Plan (SIP), submitted by the North Carolina Department of Environment and Natural Resources (NC DENR) on February 3, 2010, that incorporate changes to the state rules reflecting the 2006 national ambient air quality standards (NAAQS) for particulate matter (PM). EPA approved the remaining portions of North Carolina's February 3, 2010, SIP revision in a previous rulemaking.