
Cars run near a car-free zone which is temporarily designated during the "World Car Free Day" in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, Sept. 22, 2015. (Xinhua/Peng Zhaozhi)

Cars run near a car-free zone which is temporarily designated during the "World Car Free Day" in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, Sept. 22, 2015. (Xinhua/Peng Zhaozhi)