The Environmental Protection Agency (EPA) is approving revisions to the Alaska State Implementation Plan (SIP) submitted on October 25, 2018. The revisions adopt changes to federal emissions factors and modeling guidelines, update pre-construction permitting of stationary sources, and fix typographical and grammatical errors. The EPA is also approving the submitted revisions as meeting major source pre-construction permitting requirements for the Fairbanks North Star Borough fine particulate matter nonattainment area. On the effective date of this rule, the Alaska SIP will include provisions for electronic permit applications, online notice of draft permits, revised modeling guidelines, and updated fine particulate matter requirements in nonattainment areas.