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Basketball court area

by Timmac @, Steilacoom, WA, Friday, January 21, 2022, 14:00 (166 days ago) @ ZihuaRx

Even a cloth mask approaches 30%.N-95 and KN-95 masks provide 95%.
Another way of looking at it:
If you are wearing a cloth mask and omicron is in the crowd, you have about 30 minutes, with a surgical mask about an hour, with N-95 around 25 hours.


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