Health
CDC says masks must fit tightly – and two are better than one – The Conversation US
How well your mask works depends on how well it fits. Wearing two snug masks made of different materials offers 95% protection from exposure to aerosols that could…

On Feb. 10, the Centers for Disease Control and Prevention released new mask guidelines based on a study of how mask fit affects the wearers exposure to airborne particles. With more transmissible COVID-19 strains emerging around the world, it is important to properly use the right kinds of face masks.
Some practices such as taking your mask off to speak or wearing your mask below your nose are clearly problematic. Other mistakes may be less obvious. Everyone still needs to be wearing masks as much…
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