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Explore the sources of PM 2.5 (4)

(People's Daily Online)    08:35, January 23, 2014
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Smoke from a chimney drifts into the air in a factory in Shaoyang City, central China's Hunan Province, Jan. 12, 2014. (Xinhua/Bai Yu)


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(Editor:DuMingming、Gao Yinan)

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