The Environmental Protection Agency (EPA) is approving an amendment to the carbon monoxide (CO) State Implementation Plan (SIP) for Minnesota. Minnesota submitted this amendment to the SIP to the EPA in five separate submittals, dated November 14, 1995, July 8, 1996, September 24, 1996, June 30, 1999, and September 1, 1999. EPA proposed this action on August 6, 1999 (64 FR 42888). No adverse comments were received on EPA's proposed approval. The submittals include revisions to the motor vehicle inspection and maintenance (I/M) program currently in operation in the Minneapolis/St. Paul CO nonattainment area. The revisions make changes to the State's I/M program, including model year coverage, vehicle waiver provisions, and other program deficiencies identified by the EPA. The revision also contains provisions for the discontinuation of the I/M program if EPA redesignates the area to attainment for CO.