To determine the size distributions of water-soluble inorganic ionic species (WSIS) in roadside aerosols, sampling experiments were carried out in the urban roadside area of Jeju City on August 2018 and January 2019 by using the eight-stage cascade impactor sampler. The mass of roadside aerosols were partitioned at 57% in fine fraction, 36-37% in coarse fraction, and 6-7% in giant fraction, regardless of summer and winter. The mass concentrations of WSIS except for Na+ and SO42- in roadside aerosols were higher in winter than in summer. The size distributions of Na+, Mg2+, Ca2+ and Cl- were characterized by bimodal types with coarse particle mode peaking around 3.3-4.7㎛ and 5.8-9.0㎛ . The size distributions of NO3 - and K+ shifted from a single fine mode peaking around 0.7-1.1㎛ in winter to bimodal and/or trimodal types with peaks around coarse mode in summer. SO4 2- and NH4 + showed a single fine mode peaking around 0.7-1.1㎛ . The MMAD of roadside aerosols was lower than that of Na+, Mg2+, Ca2+ and Cl-. Based on the marine enrichment factors and the ratio values of WSIS and the corresponding value for sea water, the composition of roadside aerosols in Jeju City may be practically affected by terrestrial sources rather than marine source.

Abstract
1. 서 론
2. 연구 방법
    2.1. 시료의 채취
    2.2. 시료의 분석
3. 결과 및 고찰
    3.1. 도로변 에어로졸의 질량농도
    3.2. 질량농도의 입경분포 특성
    3.3. 이온 균형
    3.4. 도로변 에어로졸에서의 이온농도
    3.5. 이온성분들의 입경분포
    3.6. 중화기여도
    3.7. 해양의 영향
4. 결 론
REFERENCES

• 허철구(제주대학교 환경공학과) | Chul-Goo Hu (Department of Environmental Engineering, Jeju National University)
• 김수미(제주특별자치도 보건환경연구원 대기환경과) | Su-Mi Kim (Air Environmental Division, Jeju Special Self-Governing Province Research Institute of Health & Environment)
• 이기호(제주대학교 환경공학과) | Ki-Ho Lee (Department of Environmental Engineering, Jeju National University) Corresponding author