Researchers report results of a COVID-19 mask study showing which materials had the greatest filtration efficiency. The findings underscore the critical importance of layering and universal mask wearing to protect people from exposure.
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/04/210402143348.htm
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/04/210402143348.htm
COVID-19 mask study finds layering, material choice matter
![COVID-19 mask study finds layering, material choice matter]()
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April 02, 2021
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