How Face Masks Work and Which Types Offer the Best Covid-19 Protection – WSJ

August 23, 2020

note indications of an “official N95” mask – need to have the manufacturer name + NIOSH printed on the front

https://www.wsj.com/articles/how-face-masks-work-and-which-types-offer-the-best-covid-19-protection-11595946178

This entry was posted on August 23, 2020 at 12:59 am and is filed under -.

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