A man walks on an frozen lake on a hazy day in 

A man walks on an frozen lake on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)
Associated Press
A man walks on an frozen lake on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)
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