OIRA met with representatives of the White House's Council on Environmental Quality, the Environmental Protection Agency and the National Parks Conservation Association regarding a Best Available Retrofit Technology (BART) regulation on June 3. OIRA also met to discuss the BART rule on April 13 and May 16 of this year. 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.