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A woman stands on a bridge under heavy smog in Harbin, northeast China's Heilongjiang province, on October 21, 2013. Choking clouds of pollution blanketed Harbin, which is famed for its annual ice festival, reports said, cutting visibility to 10 metres (33 feet) and underscoring the nation's environmental challenges. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
A woman stands on a bridge under heavy smog in Harbin, northeast China's Heilongjiang province, on October 21, 2013. Choking clouds of pollution blanketed Harbin, which is famed for its annual ice festival, reports said, cutting visibility to 10 metres (33 feet) and underscoring the nation's environmental challenges. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)

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Thick smog blankets city, closes schools

The Chinese city of Harbin has been covered by thick smog. CNN's David McKenzie reports.

Thick smog blankets city, closes schools

The Chinese city of Harbin has been covered by thick smog. CNN's David McKenzie reports.