Buildings are seen through smog in Tianjin, Feb 21, 2014. A large area of north China including Beijing and Tianjin are experiencing another round of heavy smog and air pollution that is expected to last for a week. [Photo/Xinhua]
Shanghai forces closures amid smog
Heavy smog shrouds Guangzhou
Beijing issues yellow alert for smog
Expats discover Lianyungang with 'Go Jiangsu'