The study argued that for an approximate period of 1980 - 2000 average increase in life expectancy in certain selected counties in the US was 2.72 years. Using regression modelling techniques, it is argued that reduced air pollution (defined as fine particulate matter PM2.5) is one factor contributing to increased life expectancies. It is estimated that the individual effects of reductions in air pollution account for as much as 15% of the overall increase.
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