Description: This report, 27th in a series, summarizes the state of ambient air quality in Ontario in 1997. It covers measured levels of ozone (O3), particles and other criteria contaminants such as sulphur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO) and total reduced sulphur (TRS) compounds. Results are also presented for the measurement of a number of airborne organic compounds for 1997. In addition, the report summarizes the 1997 Air Quality Index statistics from the real-time air quality index information system, examines regional smog episodes in detail and provides a regional/national/ international perspective on air quality. The focus of this year’s publication is to report on the state of ambient air quality.
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