EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Connecticut. This revision establishes limited maintenance plans for the Hartford-New Britain-Middletown, the New Haven-Meriden-Waterbury, and the Connecticut portion of the New York-Northern New Jersey-Long Island carbon monoxide attainment areas, and provides the ten-year update to these three carbon monoxide maintenance plans. EPA is taking this action under the Clean Air Act.