N.M. Admin. Code § 20.11.3.390
The federal conformity rules under 40 CFR Part 93 Subpart A, in addition to any existing applicable state requirements, establish the conformity criteria and procedures necessary to meet the requirements of CAA Section 176(c) until such time as this conformity implementation plan revision is approved by EPA. Following EPA approval of this revision to the applicable implementation plan (or a portion thereof), the approved (or approved portion of the) criteria and procedures in 20.11.3 NMAC shall govern conformity determinations and the federal conformity regulations contained in 40 CFR Part 93 shall apply only for the portion, if any, of 20.11.3 NMAC conformity provisions that is not approved by EPA. In addition, any previously applicable implementation plan requirements relating to conformity remain enforceable until 20.11.3 NMAC is adopted.
N.M. Admin. Code § 20.11.3.390