In this series images, landmarks in Beijing, China are pictured in heavy pollution and again 24 hours later after a strong north wind blew away the smog. China's capital issued its first ever "red alert" for pollution Monday, as the city government warned that Beijing would be shrouded in heavy smog.
Tiananmen Square is seen in heavy pollution.
Tiananmen Square is seen 24 hours later under a clear sky.
Chinese Paramilitary officers stand Tiananmen Square and the Great Hall of the People is seen in heavy pollution.
Tiananmen Square and the Great Hall of the People is seen 24 hours later under a clear sky.
The Forbidden City is seen in heavy pollution.
The Forbidden City is pictured 24 hours later under a clear sky.
The Forbidden City is seen through heavy pollution.
The Forbidden City is pictured 24 hours later under a clear sky.
Tiananmen Square is seen in heavy pollution.
Tiananmen Square is pictured 24 hours later under a clear sky.