Community Studies of the Health Effects of Air Pollution— a Critique

Abstract
Geographic variation in the prevalence of respiratory disease between communities has been used to incriminate air pollution at low concentrations in the production of disease. Though demographic factors and the design and conduct of survey research affect the validity of these observations, there are other complex factors which are often neglected. From several community studies planned or conducted by the authors, illustrations will be given of the effect of the following six frequently neglected factors: the reliability of the air pollution monitoring network; the validity of the air pollution monitoring network; the competing effect of differential migration of population; the competing effect of occupational pollution of members of the population; the competing effect of socioeconomic factors; and the competing effect of personal air pollution—tobacco smoking.

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