The proposed rule development involves amendments to rule Chapter 62-204, F.A.C., to update the Department’s adoption by reference of U.S. Environmental Protection Agency (EPA) regional haze regulations at 40 CFR Part 51. The update includes recent revisions to EPA’s regulations related to Best Available Retrofit Technology (BART). Pursuant to the federal Clean Air Act, the Department is required to ensure that certain sources of visibility-impairing pollutants in Florida use BART to reduce the impact of their emissions on regional haze. The proposed amendments are part of the Department’s overall rulemaking project to implement the BART requirement.