Abstract：Volatile organic compounds (VOCs) were continuously measured by on-line gas chromatography spectrum instrument coupled with fire ion detector from June 2011 to May 2012 at Guangzhou Panyu atmospheric component Station (GPACS), China Meteorological Bureau. The variation pattern of VOC concentrations and compositions was obtained with high time resolution. The results showed that monthly variation of VOCs concentration ranged from 40.99×10-9 to 65.40×10-9 and the averaged monthly concentration was 48.10×10-9. The concentrations of VOCs were higher in winter than in summer. The diurnal variation of VOCs concentrations ranged from 35.10×10-9 to 59.13×10-9.The annual average proportions of alkanes, alkenes and aromatics were 58%, 16% and 26% respectively, its constitutional characterizations varied from different seasons. It was no weekend effect during July while it was very apparent during December. The concentrations of total VOCs in China National holidays were 39.3% and 56.7% lower respectively than in fore-and-aft China National holidays. The VOC concentrations had an anti-correlation with wind speed. The VOCs concentrations were low when the wind directions were NNE, NE and SSW because of the high wind speed, which was in contrary with the situation when the wind directions were WNW and ENE. BTEX and isoprene were dramatically higher in summer than in winter due to the fact that higher temperature caused higher solvent evaporation and plant emission.
