A man pushes a bike onto a bridge during a day of heavy pollution in Harbin in northeast China's Heilongjiang province Monday Oct. 21, 2013. Visibility shrank to less than half a football field and small-particle pollution soared to a record 40 times higher than an international safety standard in the northern Chinese city as the region entered its high-smog season. (Associated Press)
Two women cover up their mouths and noses with a jacket as they cross a street covered by dense smog in Harbin, northern China, Monday, Oct. 21, 2013. (Associated Press)
A traffic policeman signals to drivers during a smoggy day in Harbin, Heilongjiang province, October 21, 2013. (CHINA DAILY/REUTERS)
People walk through a square during a smoggy day in Jilin, Jilin province, October 21, 2013. Air quality in Chinese cities is of increasing concern to China's stability-obsessed leadership because it plays into popular resentment over political privilege and rising inequality in the world's second-largest economy. (CHINA STRINGER NETWORK/REUTERS)
A combination picture shows the 75-storey high landmark skyscraper of Shenyang in Liaoning province taken on October 11, 2013 (bottom) and October 21, 2013. (SHENG LI/REUTERS)
A statue of China's late Chairman Mao Zedong is seen on a smoggy day in Shenyang, Liaoning province, October 21, 2013. (SHENG LI/REUTERS)
A woman wearing a mask checks her mobile phone during a smoggy day on the square in front of Harbin's landmark San Sophia church, in Heilongjiang province October 21, 2013. (CHINA STRINGER NETWORK/REUTERS)
People ride along a street on a smoggy day in Daqing, Heilongjiang province, October 21, 2013. (CHINA STRINGER NETWORK/REUTERS)
People walk on a bridge during a smoggy day in Jilin, Jilin province, October 21, 2013. (CHINA STRINGER NETWORK/REUTERS)
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