This joint resolution aims to exercise congressional disapproval over a specific rule promulgated by the Environmental Protection Agency (EPA). Utilizing the authority granted under chapter 8 of title 5, United States Code, the resolution targets the EPA's rule concerning the "Air Plan Approval; Montana; Regional Haze Plan for the Second Implementation Period" . The EPA's rule, published in the Federal Register on November 28, 2025, outlines an air plan approval for Montana related to regional haze. Should this resolution be enacted by Congress, the specified EPA rule would be nullified and would have no legal force or effect. This action represents a legislative challenge to an executive agency's regulatory decision regarding environmental air quality standards in Montana.