Comparing Face Coverings in Controlling Expired Particles Surgical, N95 Masks Block Most Particles (image)

University of California - Davis

Caption

Laboratory tests of surgical and N95 masks by researchers at UC Davis show that they do cut down the amount of aerosolized particles emitted during breathing, talking and coughing. Here, Prof. Chris Cappa tests a mask by reading a prepared text in front of a machine that collects and counts particles in expired air.

Credit

Christopher Cappa, UC Davis

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