The Environmental Protection Agency (EPA) is approving Vermont's Regional Haze Five-Year Progress Report (Progress Report), submitted on February 29, 2016 as a revision to its State Implementation Plan (SIP). Vermont's SIP revision addresses requirements of the Clean Air Act (CAA) and EPA's rules that require states to submit periodic reports describing the progress toward reasonable progress goals (RPGs) established for regional haze and a determination of adequacy of the State's existing regional haze SIP. EPA is approving Vermont's Progress Report on the basis that it addresses the progress report and adequacy determination requirements for the first implementation period covering through 2018.