This joint resolution uses a congressional disapproval process to reject an Environmental Protection Agency rule that tightened national air quality standards for particulate matter, which is a form of air pollution. If passed, the resolution would cancel the EPA's rule and prevent it from taking effect. The legislation was introduced by Senator Mitch McConnell and 43 other senators, primarily Republicans, on March 14, 2024, and was referred to the Senate Committee on Environment and Public Works. The rule being challenged was originally submitted by the EPA on March 6, 2024. There is no specific funding authorization or timeline mentioned in the resolution, as disapproval resolutions operate under existing congressional procedures that allow Congress to overturn agency regulations within a limited window.