Air Pollutant Emission Inventory

The Air Pollutant Emission Inventory (APEI) is an annual report of air pollutant emissions across Canada published by Environment and Climate Change Canada. The report details the release of air pollutants from all known of sources since 1990. The APEI serves many purposes, including:

  • supporting the development of and tracking progress on air quality management strategies, policies and regulations;
  • fulfilling Canada’s domestic and international reporting obligations;
  • informing Canadians about air pollutant emissions; and
  • providing data to support Canada’s air quality health indices.

Access the data

The Air Pollutant Emission Inventory includes emissions of the key air pollutants contributing to the issues of smog, acid rain, and reduced air quality. Data on pollutant emissions can be accessed three ways:

  1. Using the online query tool to perform customized searches on pollutants by year and province/territory
  2. Viewing our online APEI report or downloading the report to your desktop
  3. Accessing the data through Canada's Open Government Portal

Emissions data is available for the following 17 air pollutants for the years 1990-2014:

Criteria air contaminants (CACs):

Heavy metals:

Persistent organic pollutants (POPs):

2014 data for all pollutants is also available at the national or province/territory level:

Data Sources

The Air Pollutant Emission Inventory is compiled from many different data sources. Emissions data reported by individual facilities to Environment and Climate Change Canada's National Pollutant Release Inventory are supplemented with well documented, science-based estimation tools to quantify total emissions. Together these data sources provide a comprehensive overview of pollutant emissions across Canada.

When improved data sources or methodologies become available the inventory is entirely recalculated and re-published to this website. This ensures that current and historical pollutant estimates are accurate and up-to-date.

Canadian Environmental Sustainability Indicators program

APEI data is used by the Canadian Environmental Sustainability Indicators program to report progress towards goals set by the Federal Sustainable Development Strategy and to inform Canadians on the state of the environment.

National Pollutant Release Inventory

The National Pollutant Release Inventory (NPRI) is a legally mandated, publically accessible inventory of facility-level pollutant releases. NPRI data is used, along with estimation models, to calculate the pollutant emissions in the APEI.

APEI Online Data Search

Create personalized queries of our data using the online search query tool below

multiple pollutant sources


Data available on this website are current as of December 1, 2015. Ongoing data analyses may result in periodic updates.

As part of Environment quality assurance process, we conduct a number of data checks for compliance purposes and to ensure completeness.

Please contact us for more information.

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