Whenever the Environmental Protection Agency (EPA) promulgates a new or revised National Ambient Air Quality Standard (NAAQS), the Clean Air Act (CAA) requires each state to make a State Implementation Plan (SIP) submission establishing that the SIP provides for the implementation, maintenance, and enforcement of the new or revised NAAQS, commonly referred to as infrastructure requirements. The EPA is approving the Alaska SIP as meeting specific infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter (PM<INF>2.5</INF>) NAAQS.