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Methods and data quality
The air quality indicators are designed to track the longer term trend in human exposure to ozone and PM2.5 levels from both a national and regional perspective.
The greenhouse gas emissions indicator, related data and trends information come directly from Canada’s National Inventory Report, 1990–2004, an annual report submitted by Environment Canada as required under the United Nations Framework Convention on Climate Change (UNFCCC) (Environment Canada 2006a). Greenhouse gas emissions are estimated according to the procedures and guidelines prescribed by the Intergovernmental Panel on Climate Change (IPCC) and are reviewed annually by a United Nations Expert Review Team. The indicator estimates Canada’s total annual anthropogenic (human-induced) emissions into the atmosphere of six main greenhouse gases:
The national freshwater quality indicator is based on the Water Quality Index (WQI), which is endorsed by the Canadian Council of Ministers of the Environment (CCME 2001). The WQI is described further on the CCME’s website (www.ccme.ca).