Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »

JavaScript appears to be disabled on this computer. Please click here to see any active alerts.

Additional Information about the U.S.-Canada Air Quality Agreement

Read documents pertaining to the U.S.-Canada Air Quality Agreement, including joint statements and the official agreement between the two governments.

View the U.S.-Canada Air Quality Agreement for related information.

Agreement Between the Government of Canada and the Government of the United States of America on Air Quality with Amendment (2000) (pdf) (440.29 KB)
Twenty Year Anniversary 1991–2011 (pdf) (39.9 KB, March 14, 2011)
Joint Statement (pdf) (33.25 KB, April 12, 2007)

Additional Information about the U.S.-Canada Air Quality Agreement

International Cooperation