A visitor stretches her arms as she looks over the Forbidden City through severe haze in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into

 

              A visitor stretches her arms as she looks over the Forbidden City through severe haze in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into
A visitor stretches her arms as she looks over the Forbidden City through severe 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)