This is what non-medical mask research looks like. There's not a lot out there. None of my masks have filters, and none fit well, two important points. They might block air pollution to my lungs, but probably won't do much on droplets coming from me. This article is from 2010 and the last pandemic, but should give you an idea what to look for. When I want to see controlled research, not the opinion of a doctor or a news writer who does medical stories, or a politically charged harangue, I put "NCBI" in the search strategy. That will get the medical articles. This is a "review article." That's another good thing to look for because you'll get a whole group of studies rolled into one and save a lot of time. Some have abstracts, and some are full text. Most articles conclude with, "further studies are needed."
https://pubmed.ncbi.nlm.nih.gov/20092668/
“Face masks to prevent transmission of influenza virus: a systematic review” Epidemiol Infect 2010 Apr;138(4):449-56
Go to the bottom of the page and look at additional sources.
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