Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving a revision to a State Implementation Plan (SIP) submitted by the State of New Mexico on March 14, 2014. New Mexico's SIP revision addresses requirements of the Act and the EPA's rules that require New Mexico to submit a periodic report assessing progress toward the reasonable progress goals (RPGs) for mandatory Class I Federal areas in and outside New Mexico with a determination of the adequacy of the State's existing regional haze SIP.