Approval and Promulgation of Air Quality Implementation Plans; State of Colorado; Motor Vehicle Inspection and Maintenance, Clean Screen Program and the Low Emitter Index, On-Board Diagnostics, and Associated Revisions

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The Environmental Protection Agency (EPA) is approving three State Implementation Plan (SIP) revisions submitted by the State of Colorado. The revisions involve amendments to Colorado's Regulation Number 11 "Motor Vehicle Emissions Inspection Program." The revisions address the implementation of the Low Emitter Index (LEI) component of Regulation No. 11's Clean Screen Program, the implementation of the On- Board Diagnostics (OBD) component of Regulation No. 11, and several other associated revisions. The EPA is approving these SIP revisions in accordance with the requirements of section 110 of the Clean Air Act (CAA).