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(Natural News) A new study from the National Institute of Standards and Technology (NIST) is warning the public against using N95 face masks that have built-in exhalation valves, as these allow unfiltered air to escape. This makes these kinds of masks useless at preventing the wearer of the mask from spreading the Wuhan coronavirus (COVID-19) to others.... |
from NaturalNews.com https://ift.tt/3eVd5GT
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