COVID-19 has mounted a sustained attack on public life, especially indoor life. Many of the largest super-spreader events took place inside—at a church in South Korea, an auditorium in France, a conference in Massachusetts. The danger of the indoors is more than anecdotal. A Hong Kong paper awaiting peer review found that of 7,324 documented cases in China, only one outbreak occurred outside—during a conversation among several men in a small village. The risk of infection indoors is almost 19 times higher than in open-air environments, according to another study from researchers in Japan.
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