“Masks protect both the wearer and others. Masks are able to filter out aerosols/particles in both directions, although they typically work better in the outward direction because of humidity behind the mask and the fact that it’s so close to the jets of air coming out of your nose and mouth when you breathe and talk.” (Posted January 29, 2021)
Linsey Marr, PhD
Professor of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University
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