The Clean Air Act is a United States federal law designed to control air pollution and protect air quality. Enacted in 1963 and amended several times, it empowers the Environmental Protection Agency (EPA) to set and enforce air quality standards. The Act aims to reduce harmful emissions from various sources, including vehicles and industrial facilities. Under the Clean Air Act, states are required to develop plans to meet national air quality standards. The law also addresses specific pollutants, such as carbon monoxide and sulfur dioxide, and promotes the use of cleaner technologies to improve public health and the environment.