A person rides a motorcycle through thick haze in Linfen, Shanxi Province, China on Thursday, 03 December, 2009. Linfen is one of the most polluted cities in the world as it turns readily available coal from the surrounding regions into coke that powers the steel mills. Due to the heavy presence of coal mines and related industries, Linfen was named the world's most polluted city from 2004-2007.
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