People clear off snow at a parking lot in Beijing, capital of China, Jan. 20, 2013. Snowfall here relieves the air pollution but affects the local traffic in the city. (Xinhua/Jin Liwang) 

Citizens walk on a snowy road in Beijing, capital of China, Jan. 20, 2013. Snowfall here relieves the air pollution but affects the local traffic in the city. (Xinhua/Jin Liwang) 

Citizens walk on a snowy road in Beijing, capital of China, Jan. 20, 2013. Snowfall here relieves the air pollution but affects the local traffic in the city. (Xinhua/Jin Liwang) 

Citizens walk amid snowfall in Jinan, capital of east China's Shandong Province, Jan. 20, 2013. Snowfall here relieves the air pollution but affects the local traffic in the city. (Xinhua/Xu Suhui) 

Snow covers tree branches in Jinan, capital of east China's Shandong Province, Jan. 20, 2013. Snowfall here relieves the air pollution but affects the local traffic in the city. (Xinhua/Xu Suhui) 

Thick snow covers tree branches amid snowfall in Jinan, capital of east China's Shandong Province, Jan. 20, 2013. Snowfall here relieves the air pollution but affects the local traffic in the city. (Xinhua/Xu Suhui)