The EPA is approving a revision to the Kansas State Implementation Plan (SIP) prepared by Kansas to maintain the 8-hour national ambient air quality standard (NAAQS) for ozone in the Kansas portion of the Kansas City area. The Kansas City area is designated attainment for the ozone NAAQS. This revision is required by the Clean Air Act. A similar final rulemaking pertaining to the Missouri portion of the Kansas City maintenance area is being done in conjunction with this rulemaking. The effect of this approval is to ensure Federal enforceability of the state air program plan and to maintain consistency between the state-adopted plan and the approved SIP.