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Kristobel
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https://www.newscientist.com/article/2398713-schools-cut-covid-19-sick-days-by-20-per-cent-using-hepa-air-filters/
Schools cut covid-19 sick days by 20 per cent using HEPA air filters
The eagerly awaited finding comes from the first randomised trial of putting HEPA filter machines into classrooms
www.newscientist.com
October 20, 2023 at 11:30 PM