
Buildings are shrouded by heavy fog in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, May 14, 2017. (Xinhua/Huang Xiaobang)

Buildings are shrouded by heavy fog in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, May 14, 2017. (Xinhua/Huang Xiaobang)