40 C.F.R. § 52.1627
Control strategy and regulations: Carbon monoxide
(a) Part D Approval. The Albuquerque/Bernalillo County carbon monoxide maintenance plan as adopted on April 13, 1995, meets the requirements of Section 172 of the Clean Air Act, and is therefore approved.
(b) Approval—The Albuquerque/Bernalillo County carbon monoxide limited maintenance plan revision dated September 7, 2004, meets the requirements of section 172 of the Clean Air Act, and is therefore approved.