Visitors gather near an entrance to the Forbidden city during a very 

Visitors gather near an entrance to the Forbidden city during a very hazy day in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the capital's air quality went off the index. (AP Photo/Ng Han Guan)
Associated Press
Visitors gather near an entrance to the Forbidden city during a very hazy day in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the capital's air quality went off the index. (AP Photo/Ng Han Guan)
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