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.
This composite photograph shows the skyscrapers during the sandstorm on Feb. 28 and the blue sky on Feb. 19, 2013 in Beijing.
A general view of the skyline in the sandstorm Feb. 28, 2013, in Beijing.
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
A general view of the skyscrapers in the sandstorm on Feb. 28, 2013, in Beijing.
A general view of the skyline in the sandstorm on Feb. 28, 2013, in Beijing.
A general view of the skyline in the sandstorm on Feb. 28, 2013 in Beijing.
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.
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.
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.
Chinese women, some wearing face masks, brace through strong wind after the capital city is hit by sandstorm in Beijing, Feb. 28, 2013.
Chinese women brace through strong wind on a street as the capital city is hit by sandstorm in Beijing, Feb. 28, 2013.