Abstract：The ambient concentrations of 58VOCs species were monitored continuously in November-December 2012 and May-July 2014 in the Qingpu District of Shanghai, China. The results showed that the average concentration of VOCs in Qingpu was low, among them, the alkanes were the most abundant component, accounting for 41.64% of the total VOCs, followed by aromatics (25.66%), alkenes (15.21%) and acetylene (7.71%). The monthly variation of the total VOCs indicated that the maximum values occurred in November while the minimum occurred in October. The diurnal pattern showed obviously two peaks. The OH radical loss rate and the ozone formation potential (OFP) were applied to assess the chemical reactivity of VOCs. The VOCs of Qingpu district showed rather high chemical activity and had the significant consistency with the concentration. For the OH radical loss rate, alkenes and aromatics accounted for 56.92% and 45.24%; and for the OFP, accounted for 29.19% and 40.82%. The most important contributors to ozone formation were ethene, isoprene, toluene, m/p-xylene, and propylene. By using the chemical mass balance (CMB) model, we analyzed the sources of VOCs. The results showed that there were six main sources of VOCs in Qingpu District of Shanghai, including vehicle exhaust, LPG leakage, paint and solvent evaporation, vegetable emission, biomass burning, industrial emission, which accounted for 43%, 5%, 16%, 3%, 14%, 7%, respectively.
