Americans have 4.8 more months of expected lifespan because of cleaner air over the past two decades, according to the first study to connect efforts to reduce air pollution to longevity. Researchers in the government-funded study used data on particulate pollution levels over two decades in 51 cities, comparing changes to life expectancies based on death and census data. They say cities that had larger reductions in air pollution saw bigger increases in life expectancy.

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