Fine-Particulate Air Pollution and Life Expectancy in the United States

In a study published in the January 22nd edition of the New England Journal of Medicine, researchers looked at the relationship between exposure to fine-particulate air pollution and increased morbidity and mortality, suggesting that sustained reductions in pollution exposure should result in improved life expectancy. This study directly evaluated the changes in life expectancy associated with differential changes in fine particulate air pollution that occurred in the United States during the 1980s and 1990s. The method used was to compile data on life expectancy, socioeconomic status, and demographic characteristics for 211 county units in the 51 U.S. metropolitan areas with matching data on fine-particulate air pollution for the late 1970s and early 1980s and the late 1990s and early 2000s. Regression models were used to estimate the association between reductions in pollution and changes in life expectancy, with adjustment for changes in socioeconomic and demographic variables and in proxy indicators for the prevalence of cigarette smoking. The study suggests that reductions in air pollution accounted for as much as 15% of the overall increase in life expectancy in the study areas and that reduction in exposure to ambient fine-particulate air pollution contributed to significant and measurable improvements in life expectancy in the United States.

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