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A digital sign reading "the highway closed due to the haze" is seennear the entrance to Wuqiang county, Hengshui city of North China's Hebei province, on Shijiazhuang-Cangzhou Expressway, on the evening of Dec 7. Hebei province raised its smog alert to red on Friday night, the highest level in the three-tier color-coded warning system. [Photo/Xinhua]
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Related:
Smog to persist in eastern China
Smog will persist in eastern China until Monday, though it will disperse in northern China on Sunday, according to the China Meteorological Center.
