The U.S. Supreme Court voted 6-2 to uphold the U.S. EPA’s Cross-State Air Pollution Rule known as CSAPR, which is the U.S. EPA’s plan to reduce soot and smog pollution from power plants in 28 states, improve air quality, and reduce life-threatening respiratory illnesses. The complex CSAPR regime was created to reduce pollution in downwind states along the Eastern seaboard from upwind states to their west. Once implemented, CSAPR is anticipated to prevent air pollution-related mortality, avoid 19,000 emergency room visits, and prevent 1.8 million missed work and school days each year. The rule is also expected to save the U.S. up to $280 billion in annual health and environmental costs.