In this action, the EPA is approving the recodification of, and revisions to, the New Mexico State Implementation Plan (SIP). The existing Air Quality Control Regulations (AQCRs) have been renumbered and reformatted into the New Mexico Administrative Code (NMAC) as required by the New Mexico State Records Center. In addition to having renumbered and reformatted the regulations, standard administrative changes have been made throughout all AQCRs, and revisions made to seven particular AQCRs. The intended effects of these revisions are to delete obsolete, nonessential, redundant, and technically inadequate regulations; make certain rules and definitions more explicit and; make one particular regulation more closely reflect current New Mexico Environment Department (NMED) policy.