.Aerosols in the atmosphere play critical role in controlling atmospheric environment, including air quality and climate. In this study, measurements of volatile organic compounds (VOCs) was made in PRD (Pearl River Delta) region (urban and rural sites) and Beijing area (urban and rural sites) in China, in addition to other gaseous and aerosol measurements. Three dimensional regional model was used to test our understanding of formation processes of ozone (O3) and secondary organic aerosol (SOA). Although model calculations generally reproduced observed VOC and O3 concentrations exceeding 100 ppbv, SOA concentrations were underestimated by a factor of more than 10, indicating that , indicating missing processes or sources in the current organic aerosol model calculations.
PRD, Beijing, VOC, ozone, aerosol