Volatile Organic Compounds Monitored Online at Three Photochemical Assessment Monitoring Stations in the Pearl River Delta (PRD) Region during Summer 2016: Sources and Emission Areas

Volatile organic compounds (VOCs) were monitored online at three photochemical assessment monitoring stations (MDS, WQS and HGS) in the Pearl River Delta region during summer of 2016. Measured levels VOCs MDS, HGS sites 34.78, 8.54 8.47 ppbv, respectively, with aromatics alkenes as major ozone precursors to secondary aerosol (SOA). The positive matrix factorization (PMF) model revealed that mainly came from vehicle exhaust, petrochemical industry, solvent use. Vehicle exhaust industrial processes losses contributed most formation potentials (OFP) VOCs, while SOA VOCs. Potential source contribution function (PSCF) analysis a north-south distribution for regions occurring MDS emission sources Guangzhou centered central districts, showed an east-west across Huizhou, Dongguan east Guangzhou, south-north Foshan, Zhaoqing Yangjiang. This study demonstrates multi-point high time resolution data can help resolve locate areas important precursors.