This legislation, officially named the "Curtailing Agency Reach and Bureaucracy Overreach on Net-Zero Act" or the "CARBON Act," proposes a significant amendment to the Clean Air Act. Its central purpose is to modify Section 302(g) of the Act, which defines the term "air pollutant." The bill explicitly states that carbon dioxide, methane, and nitrous oxide are not to be included in this definition. This change would effectively remove the Environmental Protection Agency's authority to regulate these specific greenhouse gases under the Clean Air Act, thereby curtailing federal oversight of their emissions.