Governor Matt Mead told the U.S. Environmental Protection Agency (EPA) that Wyoming should have primacy in regulating regional haze. In a letter commenting on the EPA's disapproval of part of Wyoming's State Implementation Plan (SIP),  Governor Mead said that the federal plan would be more costly and without any apparent benefit over the state plan. Mead said the EPA's  regional haze rule is intended to restore viewsheds in national parks, national forests and wilderness areas to their natural states by 2064. the rule is not aimed at improving human health. the rule, part of the clean air act, intends for states to have the regulatory lead. mead said EPA's disapproval of part of Wyoming's State Implementation Plan would result in extra supplemental controls on seven electric generating units with no perceptible improvement in visibility.