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Notes: The indicator is a population-weighted estimate based on data from 76 monitoring stations. The trend line represents the average rate of change based on the Sen method. The average rate of change is 0.9% per year, with a 90% confidence interval between 0.1% and 1.6% per year. See Appendix 1 (Map A1) for monitoring station locations and for information on trends and their statistical significance.
Sources: Environment Canada, National Air Pollution Surveillance Network Database; Statistics Canada, Environment Accounts and Statistics Division.