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Acid Rain

Indicator: Emissions of nitrogen oxides

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• In Canada, NO_x emissions remained around the 2 million tonne level over the 1991–95 period. Mobile sources (e.g., cars, trucks, rail, air, and marine transportation) accounted for 52% of total Canadian NO_x emissions in 1995, while stationary sources (e.g., power generation, industrial processing, commercial and residential combustion) accounted for the remainder.
• Total U.S. NO_x emissions fell by 4% between 1993 and 1996, from 22.3 million tonnes to 21.3 million tonnes.
• Canadian measures to reduce mobile NO_x emissions include more stringent performance standards on exhaust emissions from new vehicles, whereas measures to reduce stationary source emissions include emission limits for new fossil-fuelled power plants, retrofits at several existing power plants, and new standards for boilers, process heaters, and kilns.
• Under the Canada–United States Air Quality Agreement, Canada is committed to a 10% reduction in projected NO_x emissions (of 970 000 tonnes) from stationary sources by the year 2000. The United States must reduce its total annual NO_x emissions by approximately 1.8 million tonnes from the 1980 level by the year 2000.

Notes:
 i) U.S. emission estimates (tons) have been converted to tonnes (1 ton = 0.91 tonnes).
 ii) Canadian emission estimates are based on Canada's 1998 report to the United Nations Economic Commission for Europe (UNECE). They may differ from previously released estimates because of changes in methodology.

Canadian source:
Pollution Data Branch, Environmental Protection Service, Environment Canada.

U.S. source:
U.S. Environmental Protection Agency. 1997. National Air Pollutant Emission Trends, 1990–1996. Office of Air Quality Planning and Standards, Research Triangle Park, North Carolina.

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