Facemask mandates and stay home orders reduced the risk of COVID-19 by 15% and 8%, respectively. Findings also show that long-term exposure to fine particulate matter is a risk factor, and that the levels of exposure to in the U.S. are sufficiently high to increase the risk of COVID-19.
https://ift.tt/3xrqpuB via /r/science https://ift.tt/2S2jetQ
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