This study quantified the precipitation effect on residential odor complaints in a megacity (Seoul, South Korea). A total of 134,936 residential odor complaint records (2,922 days; 2014~2021) were subjected to Box-Cox transformation to attenuate the influence of extreme events. The inlier range, representing typical residential odor complaint levels, was determined to range from 4 to 191 cases/day (107,956 cases; 2,740 days). The precipitation effect on air pollutants was concurrently evaluated and benchmarked against previously reported values to validate the quantitative approach. After excluding days with yellow dust advisories (105,658 cases; 2,681 days), data were stratified into rainy (28,878 cases; 764 days) and non-rainy (28,878 cases; 764 days) periods. Optimal regression equations were derived from temporal variations in residential odor complaints and air pollutants (PM10, PM2.5, NOX, CO, O3, and SO2) across air temperature intervals delineated using Sturges’ rule. These equations were integrated over the temperature range (–1.9~28.1oC) to quantify the precipitation effect. The precipitation effect on air pollutants, expressed as percentage reductions (minimum~maximum), was 23.1% (21.2~74.9) for PM10, 19.8% (18.5~78.1) for PM2.5, 17.7% (17.6~72.1) for NOX, 12.3% (7.8~50.5) for SO2, 9.4% (7.3~63.4) for O3, and 8.7% (5.6~45.7) for CO. Although numerical deviations from prior estimates were observed, a consistent trend was evident. The precipitation effect on residential odor complaints was 14.2% (8.1~88.1%). Compared with air pollutants, residential odor-causing substances (predominantly gas-phase, 14.2%) exhibited a lower precipitation effect than particulate matter but a higher value than SO2 (12.3%) and lower than NOX (17.7%). Nonetheless, the maximum precipitation effect on residential odor complaints (88.1%) exceeded the maximum values for all examined air pollutants (PM10, PM2.5, NOX, CO, O3, and SO2). These findings suggest that residential odor-causing substances, -heterogeneous gas-phase compounds with physicochemical properties dependent on emission source characteristics, -can achieve high scavenging efficiency when water-soluble components dominate. This behavior may inform targeted management strategies for specific emission sources or regions.

Abstract
1. 서 론
2. 연구 내용과 방법
    2.1 민원, 기상 및 대기오염도 수집
    2.2 민원의 분류 및 발생 속도 산정
    2.3 강수효과의 정량적 평가 방법
3. 결과 및 고찰
    3.1 악취 민원, 기상 및 대기오염도 현황
    3.2 강수효과에 의한 악취 민원의 정량적 평가
    3.3 강수효과에 의한 대기오염도의 정량적 평가
4. 결 론
References
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• 김남진(서울시보건환경연구원) | NamJin Kim (Seoul Metropolitan Government Research Institute of Public Health and Environment) Corresponding author
• 조경숙(이화여자대학교 환경공학과) | KyungSuk Cho (Department of Environmental Science & Engineering, Ewha Womans University)
• 배재근(서울과학기술대학교 환경공학과) | ChaeGun Phae (Department of Environmental Engineering, Seoul National University of Science & Technology)