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Research shows that N95 masks are nearly perfect at blocking the escape of COVID-19 into the air www.valuedpostings.onlineban site
In a head-to-head comparison of masks worn by people with active COVID-19, the cheap 'duckbill' N95 came out on top, blocking 98% of COVID-19 particles in the
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posted by wdariusf 11 months ago
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