Cuts in air pollution in US cities over recent decades have added an average of five months of life to their inhabitants, research suggests.
The New England Journal of Medicine study matched air pollution and life expectancy statistics from 51 cities between 1980 and 2000.
Scientists found people living 2.72 years longer by 2000 - 15% of which they attributed to falls in pollution.
Studies have found poor air quality can worsen lung and heart disease.
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