![Beijing activates this winter's first red alert for smog (5/5)](http://www.ecns.cn/hd/2016/12/19/2db82df61ded49dd9c46b4946f309ecd.jpg)
Crowded passengers are seen in a subway train on Line 10 during rush hours in Beijing, capital of China, Dec. 19, 2016. Beijing activated its first red alert for smog this winter under which the "Odd-even" car restriction is in force, and additional public transportation has been arranged, with more buses running for longer. (Xinhua/Luo Xiaoguang)