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In this study, the temporal and spatial distribution patterns of reduced sulfur compounds (RSCs) were investigated from areas affected by strong landfill (LF) processes. Based on these measurement studies, the extent of photochemical reactions by which RSCs convert to sulfur dioxide (SO2) were evaluated using a photochemical box model (PCBM). For the purpose of this study, the concentrations of RSCs in ambient air were measured from in and around area of LF in Gunsan (G) city, Korea during several field campaigns (May through December 2004). While the distribution of RSC was generally dominated by H2S, DMS, or DMDS, such patterns were variable however depending on sampling locations and periods. At the Gunsan landfill (G-LF), DMS and H2S generally recorded the highest concentrations during the study period. The concentrations of DMS at this study site was suspected to be affected not only by LF processes but also by an oceanic source. When all RSCs were compared for the relative contribution to the photochemical production of SO2, three RSCs (DMDS, H2S, and DMS) were observed to be the most crucial of all.