Due to the receipt of an adverse comment, the Environmental Protection Agency (EPA) is withdrawing the August 14, 2017, direct final rule approving a State Implementation Plan (SIP) revision submitted by the State of Connecticut. The revision addresses the nonattainment new source review (NNSR) requirements for the 2008 8-hour ozone National Ambient Air Quality Standards (NAAQS). This action is being taken in accordance with the Clean Air Act.