Approval and Promulgation of Air Quality Implementation Plans; State of Colorado; Greeley Revised Carbon Monoxide Maintenance Plan and Approval of Related Revisions

On May 17, 2005, EPA published a notice of proposed rulemaking (NPR) to propose approval of Colorado's revised maintenance plan for the Greeley carbon monoxide (CO) maintenance area for the CO National Ambient Air Quality Standard (NAAQS). In that NPR, EPA proposed to approve the revised maintenance plan, the transportation conformity motor vehicle emission budgets for 2005 through 2009, 2010 through 2014, and 2015 and beyond, the revisions to Colorado's Regulation No. 11 "Motor Vehicle Emissions Inspection Program," and the revisions to Colorado's Regulation No. 13 "Oxygenated Fuels Program." In this action, EPA is approving the Greeley CO revised maintenance plan, the transportation conformity motor vehicle emission budgets, and the revisions to Regulation No. 11 and Regulation No. 13. This action is being taken under section 110 of the Clean Air Act.