This Agreement shall not be considered to weaken the rights and obligations of the Contracting Parties in other international conventions binding on them, including those contained in the Boundary Waters Treaty and the 1978 Great Lakes Water Quality Agreement as amended. Transboundary air pollution from the United States affects Canadian air quality. Prevailing winds can carry air pollutants from the United States to Canada, and these pollutants contribute significantly to the formation of acid rain and smog in some parts of Canada. In 1991, Canada and the United States committed to reducing the effects of transboundary air pollution by Canada-United States. Air Quality Agreement. The agreement was originally negotiated to combat transboundary acid rain and was amended in 2000 to include near-ground ozone, which is an integral part of smog. The agreement is important to Canada because it provides a formal and flexible mechanism to address transboundary air pollution, which affects Canada`s air quality, human health and environment. It has also paved the way for bilateral cooperation in a large number of scientific activities related to air quality. The Ozone Layer Annex was added to the Canada-U.S. Air Quality Agreement (December 2000) to address transboundary air pollution that results in high air quality from near-ground ozone, an essential component of smog. . .