An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Clean Air Markets

Fact Sheet: Final CSAPR Close-Out

Fact Sheet for the Final Determination Regarding Good Neighbor Obligations for the 2008 Ozone National Ambient Air Quality Standard (CSAPR Close‐Out).

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