People walk in snow in Daxing District of Beijing, capital of China, Feb. 12, 2019. (Xinhua/Li Xin)

　　Street cleaners work in snow in Daxing District of Beijing, capital of China, Feb. 12, 2019. (Xinhua/Li Xin)

　　Aerial photo taken on Feb. 12, 2019 shows a snow view of the Yudu Mountain in Yanqing District of Beijing, capital of China. A snowfall hit Beijing on Tuesday. (Xinhua/Wei Lai)

　　Aerial photo taken on Feb. 12, 2019 shows a snow view of the Yudu Mountain in Yanqing District of Beijing, capital of China. A snowfall hit Beijing on Tuesday. (Xinhua/Wei Lai)

　　Aerial photo taken on Feb. 12, 2019 shows a snow view of the Yudu Mountain in Yanqing District of Beijing, capital of China. A snowfall hit Beijing on Tuesday. (Xinhua/Wei Lai)

　　Aerial photo taken on Feb. 12, 2019 shows a snow view of the Yudu Mountain in Yanqing District of Beijing, capital of China. A snowfall hit Beijing on Tuesday. (Xinhua/Wei Lai)

　　Citizens walk in snow in Beijing, capital of China, Feb. 12, 2019. A snowfall hit Beijing on Tuesday. (Xinhua/Li Xin)

　　A citizen walks in snow in Beijing, capital of China, Feb. 12, 2019. A snowfall hit Beijing on Tuesday. (Xinhua/Li Xin)