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Data Sources and Methods for the Air Pollutant Emissions Indicators

Data

3.1 Data source

The Air Pollutant Emissions indicators used in the Canadian Environmental Sustainability Indicators (CESI) are based on Canada’s Air Pollutant Emissions Inventory (APEI) data. The APEI summaries and trends include 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 mapping application, the emissions are directly retrieved from the NPRI database.

3.2 Spatial coverage

The indicators are calculated at the national level. Air pollutant emissions are also available at the facility level in the CESI mapping application. Note that the emissions at the provincial and territorial level were not available at the time of the compilation of the indicators.

3.3 Temporal coverage

The latest year available for the Air Pollutant Emissions indicators is 2012. Past years (1990–2011) are also available at the national level. For facility emissions, information on key air pollutants is available for 2002 to 2012. All emissions used for the air pollutant emissions indicators are annual values.

3.4 Data completeness

The APEI summaries and trends are 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. The historical emissions are also updated with these new improvements.

3.5 Data timeliness

The data are current up to 2012. The CESI Air Pollutant Emissions indicators are reported approximately one year after data collection, validation, calculation and interpretation of the data have been completed.