Most of the sulfur in the condensed phase in the troposphere is originated from gas phase compounds through atmospheric oxidation ( Davis et al., 1998). In this context, it is rather surprising that sulfur compounds, mostly sulfate (SO 4 2-) composed the substantial fraction fine aerosols (e.g. Sulfur is not necessarily a dominant element in the composition of the Earth. Overall, the performance of the airborne CIMS system for SO 2 is well demonstrated for future air quality studies. In addition, an observational result over the Yellow Sea is presented to demonstrate the ability of the instrumentation to capture pollution transport from the continent. Furthermore, exemplary observational results around point sources such as a steel production facility and a petrochemical industrial facility in the Taeahn Peninsula in South Korea. In this study, we describe the performance of the CIMS system on B1900D along with descriptions on the modified airborne platform. A chemical ionization mass spectrometry (CIMS) technique using SF 6 - ion chemistry is used to take advantage of fast response (<1 Hz) and the low limit of detection (30 ppt). As the observational constraints of SO 2 become a limiting factor for emission inventory and regional and global transport model validations, we present an airborne SO 2 observational suite integrated on Beechcraft 1900D (B1900D) operated by Hanseo University.
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