January 16, 2025

Canadian GHG Emission by Province 1990, 2005, 2019-2022

Historically, Alberta has had the largest emissions of all Canadian provinces primarily due to its oil and gas sector. Ontario’s, the 2nd largest emitting province, have seen emissions drop from 2005 through 2020 mainly due to the closure of its fleet of coal-fired generation plants.

Provincial Share of GHG Emissions 2022

In 2022, Alberta accounted for almost 40% of the total Canadian GHG emissions while Ontario represented just over 20% and Quebec over 11%. Combined, these 3 provinces accounted for almost three-quarters of Canada’s total GHG emissions.

See also:
Canadian Oil and Gas Emissions 2000-2030
Canadian Emissions 2000-2030

References: 
Government of Canada