'But scientists who study viral transmission see another lesson in the pandemic school closures: Had the indoor air been cleaner and safer, they may have been avoidable. The coronavirus is an airborne threat, and the incidence of Covid was about 40 percent lower in schools that improved air quality, one study found.'
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https://www.nytimes.com/2023/08/27/health/schools-indoor-air-covid.html?action=click&module=Well&pgtype=Homepage&section=Health