This looks good. And has some research to explain it.
PopSci:
links to:
https://pubs.acs.org/doi/10.1021/acsnano.0c03252
And colour me surprised as to a double-layer mask made out of cotton and chiffon (90% polyester & 10% Spandex) was that efficient.
For further info on the materials used check the supplemental material.
I, for one, am still wearing a paper face mask given to me when I was at my local practitioner a while a go. Will probably buy several (so I can swap every other day) from the spouse of a co-worker who owns a small shop and now also makes masks (which helps, since business is not exactly good at the moment).
