An Analysis of Air-Pollution Trends in Southern Ontario

Abstract

<p>Concentrations of seven pollutants, carbon monoxide, nitric oxide, nitrogen dioxide, total nitrogen oxides, ozone, particulates, and sulphur dioxide are evaluated to identify trends since 1971 when the Canadian Clean Air Act became law. Data is analyzed from monitoring stations located in four cities in Southern Ontario. Decreases are observed in the nitrogen oxides, carbon monoxide and sulphur dioxide giving some indication of the effects of the act.</p.