The resolution, introduced by Senator Whitehouse, formally disapproves the EPA rule that approved the South Dakota Regional Haze Plan for its second implementation period. Under Chapter 8 of Title 5 of the U.S. Code, Congress can invalidate federal regulations that it deems inappropriate, and this resolution exercises that authority. The rule, published in the Federal Register on August 28, 2025, is now declared to have no force or effect , effectively nullifying the EPA's approval. This action reflects congressional concern over the plan's adequacy in addressing air quality and haze issues in South Dakota. The resolution was passed by both the Senate and the House and referred to the Committee on Environment and Public Works for further consideration.