Sandstorm hits NW China's Gansu (3/9)

Building workers view a sandstorm on the outskirt of Guazhou, Jiuquan, northwest China's Gansu Province, April 23, 2014. Parts of Gansu was hit by a sandstorm Wednesday afternoon, which reduced visibility to less than 50 meters, according to the provincial meteorological center. (Xinhua/Nie Jianjiang)