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Abstract
Several surveys, relating air pollution exposure to the prevalence of chronic respiratory disease, have recently been conducted by the Community Health and Environmental Surveillance program of the Environmental Protection Agency. The effects of sulfur oxides were studied in the Salt Lake Basin, Rocky Mountain smelter communities, New York City, and Chicago. In all four areas, chronic bronchitis prevalence was higher in polluted neighborhoods than in clean ones. In large urban areas, the effect of air pollution was comparable to the effect of moderate cigarette smoking. In all four areas, the effects of air pollution and of cigarette smoking were roughly additive. In Chattanooga, Tenn, no significant correlation was found between chronic bronchitis prevalence and exposure to moderate urban levels of nitrogen oxides.
