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Notes: Regional clusters were defined by Environment Canada. Numbers of stations per region are: Atlantic (3);
Quebec and Eastern Ontario (25); Southern Ontario (21); Prairies and Northern Ontario (14); Lower Fraser
Valley, British Columbia (11); Not in regional trends (5).
Sources: Environment Canada, National Air Pollution Surveillance Network Database; Statistics Canada, Environment
Accounts and Statistics Division.
Map source: Government of Canada. 2005. Canadian Environmental Sustainability Indicators. Statistics Canada. Catalogue number 16-251-XIE2005000.