The concentrations of ambient volatile organic compounds (VOC) were investigated from the Kwangju area. A total number of sixty six sample were collected and analyzed during day/night periods from June to September 1999. Each of the canister sample ws analyzed for alkane and aromatic compounds using a GC/MSD sys-tem. The concentration of VOC in mean day/night time, when compared, was in the order: toluene(16%)> isobu-tane(14%)= acethylene(14%)> propane(12%)> ethane(11%)> butane(9%). The VOC concentrations were gene-rally higher during the daytime than the nighttime. The VOC with light weight(such as an alkane group, $C_2$-C(suh)5) showed generally higher concentrations during day/nighttime than the VOC with heavy weight (such as an aromatic group). High correlations were among the VOC emitted from the similar sources.