What masks do the best job? That would be N95 masks without valves, followed by surgical or polypropylene masks.
from WebMD Health https://www.webmd.com/lung/news/20200807/simple-test-shows-which-face-masks-are-best?src=RSS_PUBLIC
Saturday, August 8, 2020
Simple Test Shows Which Face Masks Are Best
from WebMD Health https://www.webmd.com/lung/news/20200807/simple-test-shows-which-face-masks-are-best?src=RSS_PUBLIC
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