Pollution in Beijing
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Italy's Camila Giorgi returns the ball to Russia's Svetlana Kuznetsova during the French tennis Open second round match at the Roland Garros stadium in Paris, France.
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A teacher leads her students doing body exercise during class break in a classroom on a foggy day in Jinan, Shandong province, January 14, 2013. Heavy fog enveloped a large swathe of east and central China, with the city's residents being advised to stay
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Cranes atop a residential building under construction in central Beijing, April 18, 2012.
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Buildings and the Guomao Bridge are pictured amid heavy haze and smog in Beijing, October 29, 2011.
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Visitors to Tiananmen Square shield themselves from the sun with umbrellas on a hot and hazy day, July 28, 2010.
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Smoke billows from a chimney of a heating plant in Beijing, February 13, 2012.
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A fã de futebol e acima de tudo fanática pela selecção brasileira, Marilza Guimarães da Silva, de 63 anos, posa para a foto com uma réplica do troféu do Mundial de Futebol, vestida numa das suas diversas indumentárias com as cores do Brasil. Brasília, Maio 27, 2014. REUTERS/Joedson Alves
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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 a day with heavy haze and smog, October 28, 2011.