Here is a writeup on the topic that I prefer, from my friend Matt Bell who has been a constant stream of COVID-19 insight on his facebook wall: https://medium.c

Here is a writeup on the topic that I prefer, from my friend Matt Bell who has been a constant stream of COVID-19 insight on his facebook wall: https://medium.com/@llebttam_45762/masks-work-wear-them-b450ac9f3b7d https://medium.com/@llebttam_45762/masks-work-wear-them-b450... It includes a variety of evidence for masks, including for impromptu masks and their quality. Some key points from my linked article: * You should (like many doctors and care staff) re-use your good quality masks, and the article explains how. (e.g. put it in a breathable bag, like paper, date it, and wait four days) * If you have a good mask, like an N95, wear a lower quality mask over it, to preserve re-use of the good quality mask. * For good fit, the mask should not touch the lips.