Long-term exposure to fine particulate matter may have caused 8.9 million deaths in 2015 according to a new mortality model of outdoor particulate air pollution. These results suggest that particulates are an even more important population health risk factor than previously thought.

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Long-term exposure to fine particulate matter may have caused 8.9 million deaths in 2015 according to a new mortality model of outdoor particulate air pollution. These results suggest that particulates are an even more important population health risk factor than previously thought.