The Environmental Protection Agency (EPA) is approving parts of state implementation plan (SIP) submissions, 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 PM<INF>2.5</INF> nonattainment area (Fairbanks PM<INF>2.5</INF> Nonattainment Area). The EPA is also approving rule revisions and an associated air quality control plan chapter submitted by Alaska into the federally-approved SIP. Alaska made these submissions on October 25, 2018, November 28, 2018, December 13, 2019, (Fairbanks Serious Plan) and December 15, 2020.