The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Delaware Department of Natural Resources and Environmental Control (DNREC). The revision fulfills Delaware's nonattainment new source review (NNSR) SIP element requirement for the 2015 8-hour ozone National Ambient Air Quality Standard (NAAQS). EPA is approving these revisions to the Delaware SIP in accordance with the requirements of the Clean Air Act (CAA).