Chemical Characteristics and Sources Apportionment of Volatile Organic Compounds in the Primary Urban Area of Shijiazhuang, North China Plain - Zhang, Xiao; Junfeng Wang; Zhao, Jiangwei; He, Junliang; Lei, Yali; Meng, Kai; Wei, Rui; Xue Zhang; Zhang, Miaomiao; Ni, Shuangying; Aruffo, Eleonora (JOURNAL OF ENVIRONMENTAL SCIENCES, 2025)