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Once Hawaii drops its mask mandate later this week, no state in the United States will require everyone to wear a mask indoors to prevent the spread of COVID-19. Yet in many supermarkets, office buildings, movie theaters, and other indoor locations, some people are still masking up. But if only half, or a few, or nobody else is doing so, does the mask offer the wearer sufficient protection?
The question is becoming more urgent because even though rates of COVID-19 in most of the U.S. are currently low, they are rising in Europe—due to the fast-spreading variant Omicron BA.2—which has often presaged a spike here.
