N.M. Code R. § 20.11.61.17
All estimates of ambient concentrations required by 20.11.61 NMAC shall be based on applicable air quality models, data bases, and other requirements as specified in Appendix W to 40 CFR Part 51, its revisions, or any superseding EPA document, and approved by the department. Where an air quality model specified in the Appendix W to 40 CFR Part 51, Guideline on Air Quality Models, is inappropriate, the model may be modified or another model substituted. Any substitution or modification of a model must be approved by the department. Notification shall be given by the department of such a substitution or modification and the opportunity for public comment provided for in fulfilling the public notice requirements in Subsection B of 20.11.61.21 NMAC. The department will seek EPA approval of such substitutions or modifications.
N.M. Code R. § 20.11.61.17