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Chinese men walk on the street during a day of heavy pollution in Harbin, in northeast China's Heilongjiang province, on Monday, Oct. 21, 2013. Visibility shrank to less than half of a football field, and small-particle pollution soared to a record 40 times higher than an international safety standard in the city as the region entered its high-smog season. (AP Photo)

Chinese men walk on the street during a day of heavy pollution in Harbin, in northeast China's Heilongjiang province, on Monday, Oct. 21, 2013. Visibility shrank to less than half of a football field, and small-particle pollution soared to a record 40 times higher than an international safety standard in the city as the region entered its high-smog season. (AP Photo)

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