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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

Clean Air Markets

Protocol Gas Verification Program Participants Map

The map below shows the 2021 Protocol Gas Verification Program (PGVP) participants. A list of the historical participants is also available.