Pollution in China
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Haze blankets the National Stadium, also known as the Bird's Nest, as seen from inside the Olympic Green area during the Olympics, August 7, 2008.
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A coal-burning power station at night in Xiangfan, Hubei province, September 15, 2009.
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Paramilitary policemen practice drills inside the Forbidden City amid haze in central Beijing, December 4, 2011.
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Buildings in Beijing are pictured on an evening with heavy haze and smog, October 28, 2011.