The Environmental Protection Agency (EPA) is approving state implementation plan (SIP) revisions submitted by the State of Alaska (Alaska or the State) to address Clean Air Act (CAA or Act) requirements for the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS) in the Fairbanks North Star Borough Moderate PM<INF>2.5</INF> nonattainment area (FNSB NAA). Alaska submitted an attainment plan for the FNSB NAA on December 31, 2014, to meet applicable requirements for an area classified as "Moderate" nonattainment, and made additional submissions and provided clarifying information to supplement the attainment plan in January 2015, March 2015, July 2015, November 2015, March 2016, November 2016, and January 2017 (hereafter, the initial submission and all supplemental and clarifying information will be collectively referred to as "the FNSB Moderate Plan").