Major aromatic VOC in the ambient air in the proximity of an urban landfill facility.

In this study, the environmental behavior of major aromatic VOC (including benzene, toluene, ethylbenzene and xylene, commonly called BTEX) in the ambient air was investigated from a mid-size municipal landfill site located in Dae Gu city, Korea in the winter of 2004. A series of field campaigns were conducted in the course of the study to cover eight different locations within and near this landfill site along with a number of VOC vent systems. The mean concentrations of different VOC species in ambient air fell in a comparable range of at or above a few ppb (e.g., the most abundant toluene approximately 10 ppb). An inspection of the VOC data sets at the studied LF sites also indicated that they are quite analogous to those typically found in other urban areas in terms of their absolute magnitude and relative pattern (e.g., the general dominance of toluene over the other species). In light of the fact that there is active ventilation of landfill gas (LFG: e.g., with their LFG concentrations above a few to a few tens of ppm) in the study area with no other distinct source processes, it can be concluded that the effects of the landfill processes may be as important as other point sources in maintaining VOC concentration levels in certain urban areas.