Data Sources and Methods for the Air Pollutant Emissions Indicators
3.1 Data source
The Air Pollutant Emissions indicators used in the Canadian Environmental Sustainability Indicators (CESI) program are based on Canada's Air Pollutant Emission Inventory (APEI) data. The APEI Report includes emissions reported by facilities to the National Pollutant Release Inventory (NPRI), as well as emissions estimated by Environment Canada using the latest estimation methods, published statistics or other sources of information such as surveys and reports. The APEI summaries and trends are compiled in collaboration with provincial, territorial and regional environmental agencies. For the interactive maps, the emissions are directly retrieved from the NPRI database.
Data for the black carbon indicator come from Canada's Black Carbon Emission Inventory. As a member country of the Arctic Council's Task Force for Action on Black Carbon (TFABC), Canada has committed to voluntarily submitting an inventory of its black carbon emissions to the United Nations Economic Commission for Europe (UNECE) by February 2015. Black carbon estimates are published separately from the APEI.
3.2 Spatial coverage
The indicators are calculated at the national and provincial/territorial, level except for black carbon, which is only available at the national level. Air pollutant emissions are also available at the facility level in the CESI interactive maps, except for black carbon.
3.3 Temporal coverage
The latest year available for the Air Pollutant Emissions indicators is 2013. Past years (1990–2012) are also available. Emissions by province and territory are reported for the years 1990, 2000 and 2013. Black carbon emissions are only reported for 2013. For facility emissions, information on key air pollutants is available for 2002 to 2013. All emissions used for the Air Pollutant Emissions indicators are annual values.
3.4 Data completeness
The APEI Report is compiled to provide the best information available on all significant sources of key air pollutants. As such, improvements to data completeness are made periodically as new emission estimation methodologies are adopted and additional information is made available. Historical emissions are also updated on the basis of these new improvements.
3.5 Data timeliness
The data are current as of December 1, 2014 for the years 1990–2013. The CESI air pollutant emissions indicators are reported approximately one year after data collection, validation, calculation and interpretation have been completed.
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