The Environmental Protection Agency (EPA) is taking final action to approve a state implementation plan (SIP) revision submitted by the State of Nevada addressing the nonattainment new source review (NNSR) requirements for the 2015 ozone National Ambient Air Quality Standards (NAAQS). This SIP revision addresses the Clark County Department of Environment and Sustainability ("Department") portion of the Nevada SIP. This action is being taken pursuant to the Clean Air Act (CAA or "Act") and its implementing regulations.