Description: This report, the 34th in a series, summarizes the state of ambient air quality in Ontario during 2004 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 in Ontario. Where appropriate, air pollutant concentrations from selected Ontario cities have been compared to the information available in other cities world‐wide. The report also summarizes the results from the Air Quality Index (AQI) and Smog Alert programs and briefly examines smog episodes in 2004. Results for a select number of volatile organic compounds (VOCs) are also presented
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