This paper investigates the characteristics of high PM2.5 episodes occurred at Anmyeondo area in spring time, 2009. The monthly mean PM2.5 concentration during April was the highest in the year and especially, high levels of PM2.5 exceeding standard regulation level were sustained consecutively during 5 to 13 April. To analyze more detailed PM2.5 characteristics, numerical simulations were carried out using CMAQ(Community Multi-scale Air Quality) with IPR(Integrated Process Rate) and DDM-3D(Decoupled Direct Method). PM2.5 level was lower in daytime than that in nighttime due to vigorous vertical mixing during daytime. The chemical composition was showed that ratio of primary ion components such as sulfate(SO4 2-), nitrate(NO3 -) and ammonium(NH4 +) were nearly half of total amount of PM2.5. Aerosol and transport process dominantly contributed to PM2.5 concentration in Anmyeondo area and contribution rate of local emissions was nearly zero since Anmyeondo area has rare anthropogenic PM emission sources. DDM-3D analysis result showed that PM2.5 in Anmyeondo area was influenced by emissions from Shanghai and Shandong region of China.

Abstract
 1. 서 론
 2. 연구방법 및 실험설계
  2.1. 연구 대상지역 및 자료
  2.2. 연구 사례기간
  2.3. 수치실험 설계
  2.4. 모델결과 검증
 3. 결과 분석
  3.1. 시계열 및 수평장 모의 결과
  3.2. PM2.5 화학 조성
  3.3. 과정별 기여도 분석결과
  3.4. 수송 기원 분석
 4. 결 론
 참 고 문 헌

• 전원배(부산대학교 환경연구원) | Won-Bae Jeon (Institute of Environment Studies, Pusan National University)
• 이화운(부산대학교 지구환경시스템학부) | Hwa Woon Lee (Division of Earth Environmental System, Pusan National University) Corresponding author
• 박재형(부산대학교 지구환경시스템학부) | Jae-Hyeong Park (Division of Earth Environmental System, Pusan National University)
• 이순환(부산대학교 지구과학교육과) | Soon-Hwan Lee (Department of Earth Science Education, Pusan National University)
• 김현구(한국에너지기술연구원) | Hyun-Goo Kim (Korea Institute of Energy Research)