Test data shows that the best choices for DIY masks are cotton t-shirts, pillowcases, or other cotton materials.
These materials filter out approximately 50% of 0.2 micron particles, similar in size to the coronavirus. They are also as easy to breathe through as surgical masks, which makes them 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.
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