A Japanese study of the effectiveness of various types of face masks has shown that double-masking is not much different to a properly-worn surgical mask in preventing the spread of diseases like Covid-19.
“Wearing two masks does not make them twice as effective but only slightly more so,” Makoto Tsubokura, a professor of computational science at Kobe University, said as cited by the Asahi Shimbun newspaper. “Wearing one nonwoven mask is enough, and make sure it is put on properly without leaving a gap between the fabric and the nose.”
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