(DAILY MAIL) -- The surgical N95 mask has been held up as the gold standard when it comes to protecting against Covid.
But a study quietly re-shared by the National Institutes of Health in spring suggests the tight-fitting mask may expose users to dangerous levels of toxic chemicals.
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Researchers from Jeonbuk National University in South Korea looked at two types of disposable medical-grade masks, as well as several reusable cotton masks.