A road sweeper works in the dusty weather, and the sign on the car reads "heavy air pollution, emergency response operation" in Beijing on March 28, 2018. (Photo: Li Hao/GT)
RIGHT BG
A road sweeper works in the dusty weather, and the sign on the car reads "heavy air pollution, emergency response operation" in Beijing on March 28, 2018. (Photo: Li Hao/GT)
