(Clean Air Watch periodically accepts guest postings. This very interesting piece is from Holly Chavez, a regular contributor. We hope you find it as informative as we did.)
The Clean Air Act is the law that defines EPA's responsibilities for protecting and improving the nation's air quality and the stratospheric ozone layer. The last major change in the law, the Clean Air Act Amendments of 1990, was enacted by Congress in 1990. Legislation passed since then has made several minor changes.