Description: This report, the 31st in a series, summarises the state of ambient air quality in Ontario during 2001. It covers the measured levels of seven contaminants: ozone (O3), fine particulate matter (PM2.5), sulphur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), total reduced sulphur (TRS) compounds, and ambient mercury (Hg) in Ontario. Where appropriate, air pollutant concentrations in selected Ontario cities have been compared to the information available in other cities worldwide. The report also summarises the results from the Air Quality Index (AQI) and Smog Alert programs and briefly examines smog episodes in 2001. Results for a selected number of volatile organic compounds (VOCs) are also reviewed. As well, the results of a special air quality study conducted in the Georgian Bay area are briefly discussed.
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