Air Emissions Inventory

What is an Air Emissions Inventory?

An air emissions inventory is an accounting of air pollutant emissions released over a given time for a given political or geographic area. It can include the following sources:

  • Area (e.g. total home heating in the Edmonton region)
  • Mobile (e.g. cars, trucks, rail)
  • Point (e.g. industrial stack)

Air emissions inventories can include emissions from both anthropogenic (e.g. industrial, commercial, agricultural, transportation, etc.) and natural (e.g. forest fire, vegetation, soil, etc.) sources.

Why are Air Emissions Inventories Important for Alberta?

Air emissions inventories are a fundamental component of an air quality management system. Air emissions must be measured before they can be managed and reduced. Other components of an air quality management system include:

  • Ambient air and source emission monitoring
  • Ambient objectives
  • Approvals
  • Enforcement
  • Environmental reporting
  • Goals
  • Inspections
  • Plume dispersion modeling
  • Policies
  • Research
  • Source emission standards

A province-wide air emissions inventory is needed for:

  • Consistent and efficient Environmental Impact Assessments, Environmental Protection and Enhancement Act (EPEA) Approval applications and renewals
  • Emissions and ambient projections and forecasts
  • Implementation of the Clean Air Strategic Alliance Particulate Matter and Ozone Management Framework
  • State of the Environment Reporting

Existing Sources of Alberta Emissions Data

National Pollutant Release Inventory (NPRI) Emissions Data

Environment Canada collects emissions data from over 9,000 industrial facilities across Canada through its NPRI. Facilities that meet certain reporting criteria and whose emissions meet or exceed the set reporting thresholds of NPRI-listed substances are required to report. NPRI data can be searched at:

Air Emissions Summaries

The Air Pollutant Emissions Inventory (APEI) is compiled by Environment Canada and provides emission data for several common air pollutants by province/territory and for all of Canada. The most recent APEI inventory, as well as trends and projections, can be found at:



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Updated: Sep 18, 2018