Test data shows surgical masks are surprisingly effective, even for tiny particles. For example, in one study, researchers tested particles down to .007 microns (even smaller than viruses) and found that a simple surgical mask blocked 80%. Yet still, N95 and N99 masks outscore them. For example, in that study, N95 masks captured 96% . So it’s downright surprising that surgical masks are just as effective! Maybe virus particles are actually easy to capture because they fly on water droplets. Or maybe mask usage prevents people from touching their mouth and nose.
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