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Face Masks Provide False Hope Against Pollution

They're out of stock in China as pollution increases. But do they actually help?

February 28, 2014
5:00 PM EST
Tourists wearing face masks visit Tiananmen Square in heavy smog in Beijing on Feb. 25, 2014. Northern China is braced for more days of hazardous air quality following a week of toxic smog in Beijing that has consistently averaged more than 16 times the World Health Organization's recommended upper limit. | Imaginechina/Corbis