The Environmental Protection Agency (EPA) is finalizing approval of the State implementation plan (SIP) submission, submitted by the State of Alaska (Alaska or the State) on December 4, 2024, to address Clean Air Act requirements for the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard in the Fairbanks North Star Borough PM<INF>2.5</INF> nonattainment area. Alaska's submission includes SIP revisions to meet nonattainment planning requirements for emissions inventories, modeling and sulfur dioxide precursor demonstration for major stationary sources, control measures, attainment projection date, reasonable further progress requirements, motor vehicle emissions budgets, and contingency measures.