The Environmental Protection Agency (EPA) is approving an October 20, 2005, request from Ohio for a State Implementation Plan (SIP) revision of the Cuyahoga County carbon monoxide (CO) maintenance plan. The CO maintenance plan revision is an update to the current approved maintenance plan and continues to demonstrate maintenance of the CO National Ambient Air Quality Standard (NAAQS) for an additional 10 years. The maintenance plan revision is submitted as a limited maintenance plan for the Cuyahoga County, Ohio carbon monoxide area.