Pollution in China

Women wearing face masks run to cross a street in Beijing, May 6, 2013. The United States Embassy monitor on air quality in China classified the quality of air in Beijing as "hazardous."

A man rows a boat on a river during a hazy morning in Shaoxing, Zhejiang province, June 16, 2013. 

A man wearing a mask is seen on a street in Beijing, May 2, 2013. Street-level anger over air pollution that blanketed many northern cities this winter spilled over into online appeals for Beijing to clean water supplies.

A statue of China's late Chairman Mao Zedong is seen in front of buildings during a hazy day in Shenyang, Liaoning province, May 7, 2013. 

Beijing schools kept children indoors, January 14, 2013, and hospitals saw a spike in respiratory cases following a weekend of excessive pollution in China's smoggy capital.

A teacher leads her students doing body exercises during class break in a classroom on a foggy day in Jinan, Shandong province, January 14, 2013.

Cranes atop a residential building under construction in central Beijing, April 18, 2012.

A protester displays how his rights were violated during an anti-coup demonstration at the Victory Monument, in Bangkok, May 28, 2014.

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.

A coal-burning power station at night in Xiangfan, Hubei province, September 15, 2009.

Paramilitary policemen practice drills inside the Forbidden City amid haze in central Beijing, December 4, 2011.

Buildings in Beijing are pictured on an evening with heavy haze and smog, October 28, 2011.