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Year's worst pollution spell begins in northern cities

chinadaily.com.cn | 2016-12-17 08:44
Year's worst pollution spell begins in northern cities

The upper sky remains clear, while heavy pollution hangs low over Beijing buildings on Dec 16. Authorities warned the latest period of severe smog, expected to last six days, would be the worst so far this year and effect more than 20 cities.[Photo/IC]

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