Observational study demonstrates increased excess mortality in urban populations, suggesting fine-particulate air pollution exposure shortens lifespans.
Although the effects of other, unmeasured risk factors cannot be excluded with certainty, these results suggest that fine-particulate air pollution, or a more complex pollution mixture associated with fine particulate matter, contributes to excess mortality in certain U.S. cities.
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Dockery et al. (1993) studied this question.
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