Residents walk amid heavy fog on a street in Harbin, capital of Northeast China's Heilongjiang province on November 10, 2015. The fog has forced a total of 171 flights to be cancelled. (Photo: China News Service/ Wang Yan)
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Residents walk amid heavy fog on a street in Harbin, capital of Northeast China's Heilongjiang province on November 10, 2015. The fog has forced a total of 171 flights to be cancelled. (Photo: China News Service/ Wang Yan)