Coronavirus research now suggests that long-term exposure to PM2.5 air pollution, produced by sources including wildfires, power plants and vehicles, may make the virus particularly deadly. Scientists at Harvard University’s T.H. Chan School of Public Health looked at county-level data nationwide this spring and found that even a small increase in the amount of PM2.5 from one U.S. County to the next was associated with a large increase in the death rate from COVID-19.

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