Top 10 most air polluted Chinese cities in 2013
china.org.cn / chinagate.cn by Gong Yingchun, January 15, 2014
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Langfang
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Residents wear masks for protection from hazardous smog in Langfang, north China's Hebei Province. [File photo]
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Province: Hebei
Average annual PM2.5 density: 113.8
