"Total nitrogen oxide emissions by source, Canada, 1990 to 2024",,,,,,, ,,,,,,, Year,Oil and gas industry (emissions in kilotonnes),"Transportation (road, rail, air and marine) (emissions in kilotonnes)",Other sources (emissions in kilotonnes),Off-road vehicles and mobile equipment (emissions in kilotonnes),Electric utilities (emissions in kilotonnes),Total emissions (emissions in kilotonnes), 1990,344.1,894.1,362.4,366.6,257.0,2224.1, 1991,337.5,889.2,349.0,337.7,250.9,2164.4, 1992,353.6,930.7,340.9,332.6,262.9,2220.7, 1993,378.8,998.1,347.5,336.8,243.0,2304.2, 1994,411.0,1102.4,353.2,348.1,240.0,2454.7, 1995,427.0,1139.8,353.7,359.8,248.1,2528.3, 1996,439.2,1175.3,349.5,367.3,269.0,2600.3, 1997,483.0,1206.5,350.1,385.8,287.7,2713.1, 1998,494.7,1207.9,333.3,380.4,310.1,2726.3, 1999,512.0,1189.7,339.4,384.1,306.4,2731.6, 2000,456.4,1159.0,344.1,394.9,326.8,2681.2, 2001,450.9,1094.7,328.3,373.8,313.0,2560.6, 2002,451.7,1053.9,364.5,352.6,314.9,2537.7, 2003,493.2,1004.2,363.2,352.1,293.0,2505.7, 2004,427.3,961.8,352.5,342.0,267.5,2351.1, 2005,427.7,915.9,323.9,333.9,253.7,2255.2, 2006,427.4,864.3,283.6,307.3,224.3,2106.9, 2007,450.3,846.1,267.4,284.2,238.8,2086.9, 2008,459.8,801.5,246.4,267.8,225.1,2000.6, 2009,454.9,744.9,219.6,234.0,218.0,1871.4, 2010,445.1,718.7,227.4,259.4,233.7,1884.2, 2011,457.2,630.4,231.4,265.4,199.8,1784.1, 2012,449.5,583.1,228.6,248.6,166.3,1676.1, 2013,451.8,553.8,226.4,243.9,162.0,1637.9, 2014,462.1,521.5,227.8,225.6,167.2,1604.2, 2015,464.7,466.2,224.4,236.2,152.3,1543.8, 2016,457.0,413.9,220.4,224.9,152.4,1468.6, 2017,465.1,395.6,232.0,237.4,145.0,1475.0, 2018,475.5,395.2,228.0,232.6,129.0,1460.5, 2019,469.0,372.9,225.7,223.0,124.8,1415.4, 2020,445.0,320.1,214.9,190.5,101.9,1272.5, 2021,439.4,294.2,219.0,189.7,100.1,1242.5, 2022,443.8,297.1,221.9,180.7,95.2,1238.7, 2023,447.4,297.7,220.6,172.1,90.3,1228.1, 2024,446.7,301.7,214.3,161.2,81.1,1204.9, ,,,,,,, "Note: The indicator reports air pollutant emissions from human activities only. It does not include emissions from natural sources such as forest fires and from vegetation. The category ""other sources"" includes emissions from ore and mineral industries, manufacturing, building heating and energy generation, home firewood burning, incineration and waste, agriculture (livestock, crop production and fertilizer), dust and fires, paints and solvents, and other miscellaneous sources. Consult Table 1 (www.canada.ca/en/environment-climate-change/services/environmental-indicators/air-pollutant-emissions.html#Table1) in the Data sources and methods for a complete list of the air pollutant emissions sources included under each category. The numbers have been rounded off and their sum may not correspond to the total.",,,,,,, Source: Environment and Climate Change Canada (2026) Air Pollutant Emission Inventory (https://www.canada.ca/en/environment-climate-change/services/pollutants/air-emissions-inventory-overview.html).,,,,,,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,,,,,,