The U.S. Supreme Court has upheld key regulations from the Biden administration aimed at reducing methane emissions from oil and gas facilities, as well as mercury and other pollutants from coal-fired power plants. In a unanimous decision, the court denied emergency requests from Republican-led states and industry groups seeking to block these Environmental Protection Agency (EPA) rules. The methane regulation is expected to cut emissions by up to 80% over the next 14 years, while the mercury standards address hazardous air pollutants under the Clean Air Act. Opponents argue the EPA has overstepped its authority and set unachievable standards. Nevertheless, the Supreme Court's ruling allows these environmental protections to remain in effect while litigation continues in lower courts, potentially influencing future air pollution reduction strategies.