Canada’s Air Pollutant Emissions Inventory Report 2025

The Air Pollutant Emission Inventory (APEI) report is produced annually, by March 15, to meet Canada's international reporting obligations under the Convention on Long-Range Transboundary Air Pollution (CLRTAP) of the United Nations Economic Commission for Europe (UNECE). The 2025 report is a comprehensive inventory of anthropogenic emissions from 1990 to 2023. The APEI includes emissions data for 17 air pollutants that contribute to smog, acid rain and diminished air quality, including:

• criteria air contaminants : total particulate matter (TPM), PM less than or equal to 10 microns (PM₁₀), PM less than or equal to 2.5 microns (PM_2.5), SO_x, NO_x, volatile organic compounds (VOCs), CO and ammonia (NH₃);

• heavy metals: mercury (Hg), lead (Pb) and cadmium (Cd); and
• persistent organic pollutants (POPs): dioxins and furans, four polycyclic aromatic hydrocarbons (PAHs) compounds (benzo(a)pyrene, benzo(b)fluoranthene, benzo(k)fluoranthene and indeno(1,2,3-cd)pyrene, and hexachlorobenzene (HCB).