How Do Masks Work?

Dive Deeper

Photo of man in mask walking by mural of running person in neck gaiter
One Mask Is Good. Would Two Be Better? (From the New York Times)
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Community Use of Cloth Masks to Control the Spread of SARS-CoV-2
images from a research study of a mannequin wearing a face mask and particles escaping
Face Shields and Valved Masks Don't Fully Stop the Spread of Aerosols