Антимасочное
Aug. 23rd, 2021 11:31 amA 3,000 word deep dive into the evidence behind student mask mandates
— David Zweig (@davidzweig) August 20, 2021
Many countries around the world - with vax rates, case rates, and mortality above and below the US - do not require masks on students. Why does the US?
My latest for @NYMag https://t.co/r2nYIHVPNj
Canadian mannequin study finds mask filtration efficiencies of:
— Phil Kerpen (@kerpen) August 22, 2021
Cloth: 10%
Blue disposable: 12%
Fitted KN95: 46%
Fitted R95: 60%
KN95 with 3mm gaps: 3%
Even modest ventilation (2 air changes per hour) outperforms best mask.https://t.co/2GqCW50oyC