chromatography-mass spectrometry (GC-MS). The annual average concentrations of total VOCs (TVOCs) were as follows: background site (36.00 µg m-3) < residential site (48.71 µg m-3) < port site (61.09 µg m-3) ~ development site (62.25 µg m-3) < traffic site (73.82 µg m-3) < industrial site (98.33 µg m-3). The concentrations of TVOCs in spring and summer were higher than those in autumn and winter. The ozone formation potentials (OFPs) were calculated, and the results indicated that 1-butene had the highest OFP in the residential zone, while toluene contributed most to the OFP in the other functional zones. The ratio of xylene to ethylbenzene was used to analyze the aging of atmospheric VOCs at the background site, which was affected by transport of air pollution from urban areas. Sources of VOCs were identified by the positive matrix factorization (PMF) model and included vehicle exhausts, fuel evaporation, biomass burning, industrial processes, and coal combustion. Vehicle exhaust represented the largest source of atmospheric VOCs for all seasons, ranging from 22.41% to 38.95%, and the percentage of fuel evaporation was enhanced in summer, up to 25.94%. The contributions of biomass burning in autumn (21.11%) and winter (18.01%) were larger than those in spring (11.23%) and summer (16.94%), probably reflecting crop straw burning by communities in the later seasons. Vehicle exhaust was the dominant source of VOCs across all functional zones (30.04%-44.39%), while fuel evaporation was the major contributor (36.20%) in the residential site.