A portable device measuring air quality is placed on a desk while Jiang Zhen's daughter Dudu does her...
A portable device measuring air quality is placed on a desk while Jiang Zhen's daughter Dudu does her homework in her room, on the second day after China's capital Beijing issued its second ever "red alert" for air pollution, in Beijing, China, December 20, 2015. To match CHINA-POLLUTION/BUBBLE REUTERS/Kim Kyung-Hoon