This joint resolution would overturn an Environmental Protection Agency rule that disapproved Colorado's plan to reduce regional haze during the second implementation period under the Clean Air Act. The EPA rule, published in January 2026, rejected Colorado's state plan for improving air visibility in areas like national parks and wilderness areas by reducing pollution that causes hazy conditions. If passed by both chambers of Congress and signed by the President, this resolution would nullify the EPA's disapproval and restore Colorado's original plan. The resolution primarily affects Colorado's air quality regulations and the state's approach to meeting federal visibility standards in protected areas. The measure was introduced by Colorado Senators Bennet and Hickenlooper along with Senator Whitehouse and has been placed on the Senate calendar for potential floor consideration.