The main purpose of this legislative text is to allow Congress to disapprove a specific rule proposed by the Environmental Protection Agency (EPA). This rule pertains to the National Emission Standards for Hazardous Air Pollutants, specifically focusing on coal- and oil-fired electric utility steam generating units. The resolution aims to prevent the repeal of existing emission standards that regulate harmful pollutants emitted by these power plants. The key provision of this resolution is the formal disapproval of the EPA's rule that seeks to repeal the emission standards.