An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Stratospheric Ozone Protection: 30 Years of Progress and Achievements

November 2017 report on the 30-year history, milestones, and achievements of the Montreal Protocol and its implementation in the United States via Title VI, Stratospheric Ozone Protection, of the Clean Air Act.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.