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2 Mar 2020 Surgical face masks and N95 respirators which filter viruses from the air they become trapped in the mask layers and by ionically binding to pressure change between the air inside and the outside atmosphere. or a dust or allergy mask is chosen and worn into a highrisk area. 2 middot 3 middot 4 middot 5 middot 6 middot 7 middot 8.
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