A citizen walks in sandstorm in Hami, Northwest China's Xinjiang Uygur autonomous region, Nov 2, 2012. [Photo/Xinhua]
A citizen rides against wind in Yinchuan, Northwest China's Ningxia Hui autonomous region, Nov 2, 2012. Strong wind brought sharp drop of temperature and a sandy weather to Yinchuan on Friday.[Photo/Xinhua]