There’s one mask type you really should avoid.
Read full story of excerpts below at Source: >One Chart Shows The Best And Worst Face Mask Types, Based on The Latest Research
“Disposable surgical masks are also made of non-woven fabric. A 2013 study found that surgical masks were about three times as effective at blocking influenza aerosols than homemade face masks (that was true, at least, when air flow was slower than a cough but faster than a human breathing during light work).
“Mask studies should be taken with a grain of salt
“Although research is coalescing around the idea that a few types of masks offer the best protection, it’s not always easy to simulate how a mask will perform in real life. That’s because only some tests directly mimic the size of novel coronavirus particles, while others evaluate performance based on viruses like influenza. Researchers also still aren’t sure about the degree to which the virus gets transmitted via aerosols, since those tiny particles are extremely hard to trap and study without killing the virus.
“Some scientists even have different ideas of what constitutes an aerosol – the generally accepted cutoff is less than 5 microns (that’s roughly the size of a dust particle) – and many experts think the delineation is arbitrary altogether.
“Different studies also test masks under different circumstances: Some mimic the heavy air flow produced when a person coughs, while others mimic the air flow when a person is talking or breathing normally. And of course, masks perform differently depending on how they’re worn. That’s why it’s better to stick with more protection over less.
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