Description: This annual report, the 38th in a series, summarizes the state of ambient air quality in Ontario during 2008 and examines trends over time. It reports on the measured levels of six common pollutants: ozone (O3), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), sulphur dioxide (SO2) and total reduced sulphur (TRS) compounds. Air pollutant concentrations from selected Ontario cities have been compared to the information available in other cities from around the world. The report also summarizes the results from the Air Quality Index (AQI) and Smog Alert programs, and briefly examines smog episodes, and results of a special air quality study undertaken in Ottawa during 2007 and 2008.
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