A worker clears off fallen leaves amid smog in Qingzhou City, east China's Shandong Province, Dec. 20, 2016. Heavy smog lingers in Beijing, Tianjin and provinces of Hebei, Henan and Shandong on Tuesday. Over 20 cities have issued red alerts for smog. (Photo: Xinhua/Wang Jilin)
China experiences worst smog of 2016
2016-12-21Heavy smog disrupts air traffic in North China
2016-12-21Heavy smog disrupts air traffic in north China
2016-12-21China cities spark controversy over plans to list smog on natural disaster list
2016-12-20A city sighs as Beijing's heavy smog continues
2016-12-20Smog spreads out as readings spike
2016-12-20
