As part of project to investigate the extent of pollutant exchange in the landfill area, we measured the concentration and flux values of major aromatic VOCs which include benzene, toluene, and xylene from Nan Ji Do landfill site. The concentration and flux values of BTX determined from a total of five ventpipes were showing comparable patterns between the concentration and flux. However, when the data were compared among different ventpipes, the results generally lacked from the consistency in their concentration levels. It was found that the VOC concentration levels of ventpipes are extremely variable with the range of mean values from a few to a few hundred pptv. Interestingly enough, their temporal variability was unexpectedly strong such that the concentration of a given specie from an identical vent can vary over a few orders of magnitude through time. As being hgihly contrasting with the patterns of major components with strong temporal stability, consideration of the representative figures for the vent system was complicated. If the flux values were computed using the concentration values and exit ventilation speed, the magnitude of emissions from the NJD site is estimated to be 2.9, 47.2, 8.6 ton/yr for benzene, toluene, and xylene, respectively.