A girl covers her nose near the outfall of the Ningxia Terry Pharmaceutical Co., Ltd in Xingqing District of Yinchuan, Ningxia Hui Autonomous Region on April 1, 2013. Three big bio-fermentation pharmaceutical companies are located in the suburbs of Yinchuan. The production pollution caused serious impact on the air quality and agricultural production of the surrounding areas. People have called on the authorities to solve the pollution problems for years, but they have not been resolved. (Xinhua/Wang Peng)