How to wear a facemask — for tthe World health Organisation — https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks  gives some useful scientific advice.

 

clothing masks infographic
clothing masks infographic

Sceptics may also benefit from watching this entertaining video. Sorry I can’t do anything about the annoying adverts

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