Feng Li/Getty Images
A general view of the skyscrapers in the sandstorm on Feb. 28, 2013, in Beijing. Beijing was hit by its first sandstorm of the year while its air quality reached dangerous level.
Feng Li/Getty Images
This composite photograph shows the skyscrapers during the sandstorm on Feb. 28 and the blue sky on Feb. 19, 2013 in Beijing.
Feng Li/Getty Images
A general view of the skyline in the sandstorm Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A general view of the skyscrapers in the sandstorm on Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A general view of the skyline in the sandstorm on Feb. 28, 2013 in Beijing.
Feng LiFeng Li/Getty Images
A young man wearing the mask walks along the wall with the picture of the Great Hall of the People during severe pollution on Feb. 28, 2013, in Beijing.
Feng Li/Getty Images
A young woman wearing the mask walks along the wall with the picture of the Great Hall of the People during severe pollution on Feb. 28, 2013, in Beijing.
AP Photo/Andy Wong
A masked Chinese woman walks past waiters wearing face masks waiting for customer outside a restaurant after capital city hit by sandstorm in Beijing, Feb. 28, 2013.
AP Photo/Andy Wong
Chinese women, some wearing face masks, brace through strong wind after the capital city is hit by sandstorm in Beijing, Feb. 28, 2013.
AP Photo/Andy Wong
Chinese women brace through strong wind on a street as the capital city is hit by sandstorm in Beijing, Feb. 28, 2013.
