Description: This report, 29th in a series, summarizes the state of ambient air quality in Ontario in 1999. 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. In addition, the report summarizes the 1999 Air Quality Index (AQI) statistics from the realtime AQI information system, examines regional smog episodes, summarizes the air quality of a select number of volatile organic compounds (VOCs) and provides an international, national and regional perspective on air quality. Once again, the focus of this year’s publication is to report on the state of ambient air quality.
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