OIRA met with representatives of Pacificorp power company, the White House's Council on Environmental Quality and the Environmental Protection Agency regarding a Best Available Retrofit Technology (BART) regulation on May 16. The rule, also known as the Clean Air Visibility Rule, would seek to limit regional haze by requiring power plants and factories to install the best available retrofit technology (BART) to control sulfur dioxide and other emissions. These emissions lead to visibility impairment, which is widespread throughout the national park system.