Observation and analysis of VOCs in nine prefecture-level cities of Sichuan Province, China - Wenjun Wang; Tingting Xiong; Wei Zhang; Bin Luo; Dongmei Wang; Xincheng Jiang; Zhihan Rao; Yan Jiang; Yue Liu; Huan Cheng; Xiaojing Luo; Meikun Fan; et al. (Environmental Monitoring and Assessment, 2020)