Canada-United States Air Quality Agreement

The Canada- United States Air Quality Agreement [PDF] was signed by Canada and the United States in Ottawa, Ontario on March 13, 1991 to address transboundary air pollution leading to acid rain. Both countries agreed to reduce emissions of sulphur dioxide (SO₂) andnitrogen oxides (NOx), the primary precursors to acid rain and to work together on acid rain related scientific and technical cooperation.

The Ozone Annex was added to the Canada-United States Air Quality Agreement (December 2000) to address the transboundary air pollution leading to high air quality levels of ground-level ozone, a major component of smog. The long-term goal of the Ozone Annex is the attainment of the ozone air quality standards in both countries. Where there are transboundary flows of the pollution that creates ozone, the Ozone Annex commits both countries to reduce their emissions of nitrogen oxides and volatile organic compounds, the precursor pollutants to ground-level ozone. For more information see Ground-Level Ozone: Occurrence and transport in Eastern North America (also available in PDF)

Canada-US Air Quality Agreement Progress Reports

Progress under the Canada-U.S. Air Quality Agreement

Canada-U.S. Air Quality Agreement Progress Report 2006
(also available in PDF)
Canada-U.S. Air Quality Agreement 2004 Progress Report
Cleaner Air through Cooperation (Brochure) - 2003 (also available in PDF)
Canada-U.S. Air Quality Agreement 2002 Progress Report
Saskatchewan-North Dakota Monitoring, 1999-2000
Canada-U.S. Air Quality Agreement 2000 Progress Report
Canada-U.S. Air Quality Agreement 1998 Progress Report
Canada-U.S. Air Quality Agreement 1996 Progress Report
Canada-U.S. Air Quality Agreement 1994 Progress Report
Canada-U.S. Air Quality Agreement 1992 Progress Report

Canada-United States Air Quality Agreementand Ozone Annex

Canada-U.S. Air Quality Agreement - 1991
Ozone Annex - December 7, 2000