An aerial image shows a sea of dense mist gathering over Yangquan city, in North China's Shanxi province, on March 4. [Photo/IC]

Nanshan Park, a landmark in Yangquan city, North China's Shanxi province, is blanketed with fog on March 4, providing spectacular views. [Photo/IC]

Yangquan city in North China's Shanxi province is shrouded by a cloak of mist on March 4. [Photo/IC]