With so many fabrics and styles out there, the question, "How do I know if my mask is effective?" is on many people's minds. Masks—and the many myths people believe about them—have come to dominate ...
SAN FRANCISCO (KGO) -- The omicron surge has caused the CDC to finally update its mask guidance late last week, indicating a clear preference for the level of protection offered by N95 and KN95 masks.
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