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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 CESI come from the air pollutant emissions summaries and trends compiled by Environment Canada’s National Pollutant Release Inventory (NPRI) program.

The air pollutant emissions summaries and trends are compiled in collaboration with provincial, territorial and regional environmental agencies. The emissions inventory (summaries and trends) includes emissions reported by facilities to the 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. For the mapping application, the emissions are directly retrieved from the NPRI database.

3.2 Spatial coverage

The indicators are calculated at the national, provincial and territorial levels. Air pollutant emissions are also available at the facility level in the CESI mapping application.

3.3 Temporal coverage

The latest year available for the air pollutant emissions indicators is 2011. Past years (1990–2010) are also available at the national level. For facility emissions, information on key air pollutants is available for 2002 to 2011. All emissions used for the air pollutant emissions indicators are annual values.

3.4 Data completeness

The air pollutant emissions summaries and trends are compiled to provide the best information available on all significant sources of the 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 2011. The CESI air pollutant emissions indicators are reported approximately two years after data collection, once validation, calculation and interpretation of the data have been completed.