[pmorici]

Masks made from commonly available fabrics were found to have similar filtration efficiency to N95 certified masks.

[0] https://pubs.acs.org/doi/10.1021/acsnano.0c03252

[trhway]

you need to tell that to those picky Canadians (https://www.cbc.ca/news/politics/n95-masks-rejected-montreal...), healthcare workers and everybody else who wants N95.