People dance at Shuimogou Park in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Feb. 25, 2014. The air became very fresh after a heavy snowfall in Urumqi on Tuesday. (Xinhua/Wang Fei)

Fishes swim in water at Shuimogou Park in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Feb. 25, 2014. The air became very fresh after a heavy snowfall in Urumqi on Tuesday. (Xinhua/Wang Fei)

People pose for photos with the snow scenery at Shuimogou Park in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Feb. 25, 2014. The air became very fresh after a heavy snowfall in Urumqi on Tuesday. (Xinhua/Wang Fei)

Hot spring water steams in Shuimogou Park in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Feb. 25, 2014. The air became very fresh after a heavy snowfall in Urumqi on Tuesday. (Xinhua/Wang Fei)

A photographer takes photo at Shuimogou Park in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Feb. 25, 2014. The air became very fresh after a heavy snowfall in Urumqi on Tuesday. (Xinhua/Wang Fei)