Characterization and source identification of PM2.5-bound polycyclic aromatic hydrocarbons in urban, suburban, and rural ambient air, central China during summer harvest

Xinli Xing, Zhanle Chen, Qian Tian, Yao Mao, Weijie Liu, Mingming Shi, Cheng Cheng, Tianpeng Hu, Gehao Zhu, Ying Li, Huang Zheng, Jiaquan Zhang, Shaofei Kong, Shihua Qi