Originally Posted by
VariablePitchP
99% of masks do absolutely nothing against COVID, mean they can’t be used in critical healthcare settings where they might actually be useful, and can do more harm than good. Not a single agency recommends the public wearing them so would be a bizarre policy to implement.
Strangely, where I am, in three weeks they have gone from propagating advice almost as ridiculous as this, to setting up emergency fabrication units for makeshift masks.
A quick search for figures produced this
https://www.sciencedirect.com/scienc...02817714630555
"The respirator provided an efficiency of 94 to 96 percent, compared with 90 to 92 percent and 85 to 86 percent for the molded and tie-on
surgical masks, respectively."