Skyscrapers are obscure by heavy haze in Beijing Sunday, Jan. 13, 2013. 

Skyscrapers are obscure by heavy haze 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
Skyscrapers are obscure by heavy haze 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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