Driving forces of agricultural ammonia emissions in semi-arid areas of China: A spatial econometric approach - Yunrui Ai; Liyang Xue; Yong Li; Quanxi Xu; Xuan Dai; Yancong Wu; Ning Kang; Tingting Zhang; Jianfeng Gou; Yan Tao (Journal of Hazardous Materials, 2025)