In 1970, Congress created the Environmental Protection Agency (EPA) and passed the Clean Air Act, giving the federal government authority to clean up air pollution in this country. Since then, EPA and states, tribes, local governments, industry, and environmental groups have worked to establish a variety of programs to reduce air pollution levels across America. The Clean Air Act has helped change the way many of us work or do business. In some cases, it has even changed the way we live. This guide provides a brief introduction to the programs, philosophies, and policies in the Clean Air Act.