Description: This annual report, the 37th in a series, summarizes the state of ambient air quality in Ontario during 2007 and examines trends over time. It covers the measured levels of six common contaminants: 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 special studies of air quality that were undertaken in 2007: the Border Air Quality Study, and the Ottawa Study.
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