There’s no doubt N95/KN95/KF94/FFP2 is better than surgical is better than cloth but the numbers in this graphic are classic data bullshithttps://twitter.com/seungminkim/status/1478867026542219264 …
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Looks like the WSJ just re-styled a chart from here, except they skipped the fit-tested N95. Even though the thesis of that ACGIH page is "Workers need a fit-tested* respirator"https://www.acgih.org/covid-19-fact-sheet-worker-resp/ …
But ACGIH also doesn't, AFAIK, claim to be the original source of the numbers. They say "according to the CDC" then also list these sources:https://www.acgih.org/covid19-references/#resp …
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