Dental hygienists might be another group that could be studied, and hopefully one with fewer confounding factors. As an added bonus they're usually (in the Bef

Dental hygienists might be another group that could be studied, and hopefully one with fewer confounding factors. As an added bonus they're usually (in the Before Times) wearing surgical masks as opposed to a [K]N-95, which is anecdotally a lot more reflective of what the general population is wearing (if they're wearing anything at all). Edited to add: As an added, added bonus, dental hygienist skews heavily female, whereas construction and remediation skews heavily male. Female populations also wouldn't have the confounding factor of facial hair, which interferes with the seal of a respirator. Full disclosure: I type all this while I'm wearing a half-face respirator with P-100 cartridges on it because I'm doing a bunch of sanding today. I also have a goatee. Read into that what you will.