EPA is approving a portion of a State Implementation Plan (SIP) submitted by the State of New Mexico for the purpose of addressing the "good neighbor" provisions of the Clean Air Act (CAA) section 110(a)(2)(D)(i) for the 1997 ozone National Ambient Air Quality Standard (NAAQS) and the 1997 PM<INF>2.5</INF> NAAQS. This SIP revision satisfies a portion of the State of New Mexico's obligation to submit a SIP that demonstrates that adequate provisions are in place to prohibit air emissions from adversely affecting another state's air quality through interstate transport. This rulemaking action is being taken under section 110 of the CAA and addresses one element of CAA section 110(a)(2)(D)(i), which pertains to prohibiting air pollutant emissions from within New Mexico from contributing significantly to nonattainment of the 1997 8-hour ozone and PM<INF>2.5</INF> NAAQS in any other state.