With an emphasis on the extension of our efforts to accumulate the databases for the soil-air Hg exchange processes, we conducted measurements of concentrations, concentration gradients, and fluxes of airborne Hg along with relevant environmental parameters from a monitoring site located in a residential area of Seoul, Korea during late May through mid June 1998. Our measurements showed that the frequency with which Hg emissions occur slightly exceeds those of dry deposition (58 vs 42%) and that the strength of emission is quite comparable in magnitude with that of deposition (~±8 ng/m²/hr). The results of our work also indicated quite complex temporal distribution pattern of Hg with the occurrence of reduced Hg concentrations during daytime over diurnal scale. When the relationships between different parameters are compared for both emission and dry deposition, they generally exhibited a similar pattern such that Hg data tend to be strongly correlated with several important chemical species investigated concurrently including nitrogen dioxide. Overall, the reasonably low values in concentration, gradient, and flux of Hg at the study site suggests that the Hg distributions in a residential area may not necessarily be affected by any major source processes.
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