Air Quality In The USA
As we approach the 50th anniversary of the Clean Air Act, here are some highlights on how air quality has changed in the United States and how it compares to the rest of the world. The Clean Air Act was established in 1963 and is a federal law that is regulated by the Environmental Protection Agency (EPA). Significant amendments to the Act occurred in 1970, 1977 and 1990. The EPA has set standards for six common air pollutants: ozone, particulate matter, carbon monoxide, nitrogen oxides, sulfur dioxide and lead.