This study investigated the weather conditions, fine particle concentration, and ion components in PM2.5 when two cold fronts passed through Busan in succession on February 1 and 2, 2021. A analysis of the surface weather chart, AWS, and backward trajectory revealed that the first cold front passed through the Busan at 0900 LST on February 1, 2021, with the second cold front arriving at 0100 LST on February 2, 2021. According to the PM10 concentration of the KMA, the timing of the cold front passage had a close relationship with the occurrence of the highest concentration of fine particles. The transport time of the cold front from Baengnyeongdo to Mt. Gudeok was approximately 11 hours . The PM10 and PM2.5 concentrations in Busan started to increase after the first cold front had passed, and the maximum concentration occurred two hours after the second cold front passed. The SO4 2-, NO3 -, and NH4 + concentration in PM2.5 started to increase from 1100 to 1200 LST on February 1, after the first cold front passed, and peaked at 0100 LST to 0300 LST on February 2. However, the highest Ca2+ concentration was recorded 2-3 hours after the second cold front had passed.

Abstract
1. 서 론
2. 재료 및 방법
3. 결과 및 고찰
    3.1. 부산지역 2021년 2월 1일과 2일의 한랭전선 통과시의 기상 특성
    3.2. 부산지역 2021년 2월 1일과 2일의 한랭전선 통과시의 미세먼지 농도 특성
    3.3. 부산지역 2021년 2월1일부터 2월 2일 한랭전선통과 시 PM2.5 중의 이온 성분 특성
4. 결 론
REFERENCES

• 전병일(신라대학교 항공교통관리학과) | Byung-Il Jeon (Department of Air Traffic & Operation Management, Silla University) Corresponding author