Data Sources and Methods: Air Pollutant Emissions Indicators
3.1 Data source
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 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 level. Air pollutant emissions are also available at the facility level for the CESI mapping application.
3.3 Temporal coverage
The latest year available for the air pollutant emissions indicators is 2010. Past years (1990–2009) are also available at the national level. For facility emissions, information on key air pollutants is available for 2002 to 2010. 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 methodologies are adopted and additional information is made available.
3.5 Data timeliness
The data are current up to 2010. 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.
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