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BEIJING, CHINA - DECEMBER 18:  Tourists wearing masks visit the Tiananmen Square on December 18, 2016 in Beijing, China. At least 24 cities in North China issued red alerts on Friday as heavy smog will shroud the country's northern regions in the following two days.  (Photo by VCG/VCG via Getty Images)
BEIJING, CHINA - DECEMBER 18:  Tourists wearing masks visit the Tiananmen Square on December 18, 2016 in Beijing, China. At least 24 cities in North China issued red alerts on Friday as heavy smog will shroud the country's northern regions in the following two days.  (Photo by VCG/VCG via Getty Images)

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    Heavy smog causes chaos in China

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Heavy smog causes chaos in China

A red alert for air pollution was issued in 23 cities in northern China, affecting severely schools and factories in Beijing.

Heavy smog causes chaos in China

A red alert for air pollution was issued in 23 cities in northern China, affecting severely schools and factories in Beijing.