KF-94 masks

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South Korea's KF94 mask does a good job concealing the Mona Lisa's smile — but how effective is it at preventing coronavirus spread? Here, masked pedestrians stroll through a shopping district in Seoul. Chung Sung-Jun/Getty Images hide caption

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Chung Sung-Jun/Getty Images

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Coronavirus FAQ: Why Am I Suddenly Hearing So Much About KF94 Masks?

January 22, 2021 • There are N95s, reserved for health workers. There are KN95s, which you can buy easily — except that quality may vary. And now South Korea's KF94 masks are getting a lot of buzz.