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Both sides have made excellent progress in reducing emissions of sulphur dioxide (SO2) and nitrogen oxides (NOx), the two main pollutants that cause acid deposition. Since 2000, the Parties have also made good progress in reducing volatile organic compound (VOC) emissions and further reducing NOx emissions in order to reduce near-ground ozone in the border region. The Canada-U.S. Air Quality Agreement (Agreement) directs the International Joint Commission (IJC) to invite public comments on the progress reports prepared by the Clean Air Committee and to provide the governments of Canada and the United States with a summary of the observations to assist them in implementing the agreement. Air quality, pollutants, research and applications, networks, measurement methods, data sets. To obtain permission to copy Government of Canada documents for commercial purposes, apply for the Crown Copyright Clearance at: Environment and Climate Change Canada Public Inquiries Centre 7th Floor, Fontaine Building 200 Sacré-Coeur Boulevard Gatineau, QC K1A 0H3 Phone: 819-997-2800 Free: 1-800-668-6767 (only in Canada) E-mail: Photos: Public domain © Her Majesty the Queen in Right of Canada, represented by the Minister of Environment and Climate Change, 2017 Annex ozone has been added to the Canada-United States Air Quality Agreement (December 2000) to address transboundary air pollution, which results in high air quality from near-ground ozone, an essential component of smog. The long-term objective of the Ozone Annex is to achieve air quality standards in both countries.