ABSTRACT Cohort epidemiological studies consistently agree that small particulates increase mortality, but they do not agree about the magnitude of this effect. As cohort studies have included observations from more places, they have found smaller effects. This study relies on a sophisticated air pollution model to predict pollution concentrations across all counties in the contiguous United States. We test whether examining all counties in the US affects the magnitude of the pollution mortality effect. We find significant but smaller effects. The results suggest that continued epidemiological research using a broader base of locations is needed.
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