Test data shows that the best choices for DIY masks are cotton t-shirts, pillowcases, or other cotton materials. These materials are able to filter out approximately 50% of 0.2 micron particles, similar in size to the coronavirus. They are also as easy to breathe through as a surgical mask, which makes them more comfortable enough to wear for several hours.
Doubling the layers of material for your DIY mask gives a very small increase in filtration effectiveness, but makes the mask much more difficult to breathe through.... Read More
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