3 ms·
That's for an N95 respirator combined with a surgical mask. Most of us are just wearing surgical-type masks, and I doubt they make any difference to oxygen leve
by Reason077 6y ago
That's for an N95 respirator combined with a surgical mask. Most of us are just wearing surgical-type masks, and I doubt they make any difference to oxygen levels.
(If they did, I'd be very worried about surgeons!)