Characteristics of Volatile Organic Compounds (VOCs) in Seoul Metropolitan during 2022 SIJAQ Campaign; [SIJAQ II 캠페인 기간 서울 도심의 휘발성 유기화합물 (VOCs) 조성 특성]

초록

Volatile organic compounds (VOCs) are key precursors in the formation of ozone and secondary organic aerosols. Emitted into the atmosphere from a variety of sources, VOCs exhibit a wide range of reactivity. Consequently, accurately determining VOC species is imperative for reducing VOC-related air pollution on local and regional scales. In this study, 56 VOC species were measured in real time using the TD-GC-FID method, which involves collecting airborne VOCs by thermal desorption (TD) tubes, separating them via gas chromatograph (GC), and determining their concentrations with a flame ion detector (FID). Experiments were conducted for the Satellite Integrated Joint Air Quality (SIJAQ) campaign at the Mediheal Earth Environmental Science Hall of Korea University in Seoul in May~June (early summer) and November (early winter) 2022. In this campaign, the proportion of alkene has increased compared to the past, with the proportion of alkene 25.3% in summer and 23.3% in winter, respectively. Alkenes such as propylene, trans-2-pentene, trans-2-butene were higher in summer than in winter and exhibited the highest ozone formation potential (OFP). In particular, butene and pentene isomers along with propylene, showed strong correlations with temperature, suggesting the contribution of fugitive emissions through evaporation. The temporal distribution of VOCs, correlations, and principal component analysis results all emphasize automobile emissions as the main source of VOCs in Seoul. © 2026, Korean Society for Atmospheric Environment. All rights reserved.

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