‘There seems to be diminishing returns on the need for’ face coverings
By 
Arizona National Guard service members direct visitor check-in and collect samples for testing at a COVID-19 testing site at the Graham County Fairgrounds in Safford, Arizona, Sept. 19, 2020. (U.S. Army National Guard photo by Spc. Thurman Snyder)
(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.
Researchers from Jeonbuk National University in South Korea looked at two types of disposable medical-grade masks, as well as several reusable cotton masks.