The EPA is approving revisions to the New Mexico State Implementation Plan (SIP) submitted by the Governor of New Mexico on behalf of the Albuquerque Environmental Health Department (AEHD) in a letter dated September 23, 2009 (the September 23, 2009 SIP submittal). The September 23, 2009 SIP submittal concerns revisions to New Mexico Administrative Code Title 20, Chapter 11, Part 49, Excess Emissions (20.11.49 NMAC--Excess Emissions) occurring during startup, shutdown, and malfunction related activities. We are approving the September 23, 2009 SIP submittal in accordance with the requirements of section 110 of the Clean Air Act (the Act).