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Heavy smoke blackened the Sky in Lanzhou

(chinadaily.com.cn) Updated: 2010-05-06 00:30
 Heavy smoke blackened the Sky in Lanzhou

Smoke and flames billow from petroleum wells at an oil refinery in Lanzhou, Northwest China's Gansu province, May 5, 2010. The heavy smoke was caused by a technology adjustment and it may lead to air pollution, a manager with the oil refinery said. [Photo/Asianewsphoto] 

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