Passengers walk at the Hefei Railway Station in fog-bound Hefei, capital of east China's Anhui Province, Jan. 3, 2017. A red alert for fog in large parts of China was issued by the National Meteorological Center on Tuesday. (Xinhua/Yang Xiaoyuan)
China's national observatory on Tuesday issued a red alert for fog in a number of northern and eastern regions, the first ever national red alert for fog.
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