A smoke covered building behind a Chinese flag
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Heavy smog caused by burning straw affects China

12 June 2012 Last updated at 13:28 BST

Heavy smog covered the city of Bengbu in China's eastern Anhui province on Sunday, 10 June, forcing people to stay indoors.

The pollution is being blamed on local farmers who burn straw in their fields after the wheat harvest.

Xiaoyun Yao reports.