Lecture
This lecture covers the evolution and milestones of the U.S. Clean Air Act, a federal law regulating air emissions. It discusses the establishment of National Ambient Air Quality Standards, control of hazardous air pollutants, and the program's impact on reducing emissions. The lecture also explores the Acid Rain Program, the effects of air pollutants on human health and the environment, and the different strategies implemented to control emissions, such as the command-and-control approach and the Emissions Trading System. The instructor delves into the challenges faced by states in complying with the Act, the impact on different regions, and the significant reductions achieved in emissions over the years.