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.