Skip to Content
Return to Navigation

Why Simple Cloth Masks Without Valves Are Better At Fighting The Spread of Covid-19-The Washington Post, 6/28

Those face masks you see with coin-sized valves on the front may look intriguing but they are not as good at preventing the spread of the novel coronavirus as the seemingly lower-tech, non-valved masks. The Washington Post, 06/28/2020

Share this article: