Description: This annual report, the 36th in a series, summarizes the state of ambient air quality in Ontario during 2006 and examines trends over time. It covers the measured levels of six contaminants: ozone (O3), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), sulphur dioxide (SO2) and total reduced sulphur (TRS) compounds. An overview of the air quality of 12 cities in the Great Lakes Basin area is also provided in the report based on ground‐level ozone and PM2.5 concentrations. The report also summarizes the results from the Air Quality Index (AQI) and Smog Alert programs, and briefly examines smog episodes in 2006.
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