Summertimefine particulate nitrate pollution in the North China Plain: increasing trend and formation mechanisms

Liang Wen1, Likun Xue1, X. Wang1, Jianmin Chen1, Tao Wang2 and Wenxing Wang3, (1)Shandong University, Environment Research Institute, Jinan, China, (2)Hong Kong Polytechnic University, Department of Civil and Environmental Engineering, Hong Kong, Hong Kong, (3)Shandong University, Environment Research Institute, Qingdao, China