The Environmental Protection Agency (EPA) is approving portions of the State Implementation Plan (SIP) submission provided by the State of Florida, through the Florida Department of Environmental Protection (FDEP), through a letter dated September 18, 2018. This submission pertains to the infrastructure requirements of the Clean Air Act (CAA or Act) for the 2015 8-hour ozone national ambient air quality standards (NAAQS). Whenever EPA promulgates a new or revised NAAQS, the CAA requires that each state adopt and submit a SIP submission to establish that the state's implementation plan meets infrastructure requirements for the implementation, maintenance, and enforcement of each such NAAQS. FDEP made the required SIP submission to assure that the Florida SIP contains provisions that ensure the 2015 8-hour ozone NAAQS is implemented, enforced, and maintained in Florida. EPA has in this action determined that Florida's infrastructure SIP submission satisfies certain required infrastructure elements for the 2015 8-hour ozone NAAQS.