Aerosols are a bigger coronavirus threat than WHO guidelines suggest – here’s what you need to know
Goodarz Ahmadi, Professor of Mechanical Engineering, Clarkson University
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When someone coughs, talks or even breathes, they send tiny respiratory droplets into the surrounding air. The smallest of these droplets can float for hours, and there is strong evidence that they can carry live coronavirus if the person is infected.
Until mid-July, however, the risk from these aerosols wasn’t incorporated into the World Health Organization’s formal guidance for nations. The WHO instead suggested that the coronavirus was primarily transmitted by coughing or...