A man wearing a mask walks past a restaurant on a hazy 

A man wearing a mask walks past a restaurant on a hazy day in Beijing Saturday, Jan. 12, 2013. Air pollution levels in China's notoriously dirty capital were at dangerous levels Saturday, with cloudy skies blocking out visibility and warnings issued for people to remain indoors. (AP Photo/Alexander F. Yuan)
Associated Press
A man wearing a mask walks past a restaurant on a hazy day in Beijing Saturday, Jan. 12, 2013. Air pollution levels in China's notoriously dirty capital were at dangerous levels Saturday, with cloudy skies blocking out visibility and warnings issued for people to remain indoors. (AP Photo/Alexander F. Yuan)
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