EPA is approving a State Implementation Plan (SIP) revision submitted by the State of New Mexico for the purpose of addressing the "good neighbor" provisions of the Clean Air Act (Act or CAA) section 110(a)(2)(D)(i) for the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS or standards) and the 1997 PM<INF>2.5</INF> NAAQS. This SIP revision addresses the requirement that New Mexico's SIP has adequate provisions to prohibit air emissions from adversely affecting another state's air quality through interstate transport. In this action, EPA is approving the New Mexico Interstate Transport SIP provisions that address the requirement of CAA section 110 (a)(2)(D)(i)(I) that emissions from New Mexico sources do not interfere with maintenance of the 1997 8-hour ozone NAAQS and the 1997 PM<INF>2.5</INF> NAAQS in any other state. In addition, EPA is approving the provisions of this SIP submission that address the requirement of section 110(a)(2)(D)(i)(II) that emissions from the State's sources do not interfere with measures required in the SIP of any other state under part C of the CAA to prevent "significant deterioration of air quality." For purposes of the 8-hour ozone NAAQS, EPA is also approving a SIP revision that modifies New Mexico's Prevention of Significant Deterioration (PSD) SIP for the 1997 8-hour ozone NAAQS to include nitrogen oxides (NO<INF>X</INF>) as an ozone precursor. This action is being taken under section 110 and part C of the Act.