The exposed population of a vulnerable group to high ozone episodes (exceeding 60 ppb/8h) was estimated in Busan metropolitan city from 2000 to 2010. The frequency of high ozone days at monitoring sites and the number of the population aged over 65 were used to calculate the accumulated (total, seasonal, and yearly) number of the exposed older population (EOP) to high ozone episodes during the study period based on administrative areas, by interpolation and zonal mean methods in ArcGIS software. The older population in this city had increased significantly from 2000 to 2010 (representing over 10% of the total population in 2010). The vulnerable areas (e.g. the eastern area of the city) of the EOP to high ozone episodes were different from the areas with frequent high ozone episodes (e.g., the western area) due to the increase of the older population in particular areas. The difference was more significant in spring than in any other season, and in 2010 than in previous years (2000 and 2005).

Abstract
 1. 서 론
 2. 재료 및 방법
 3. 결과 및 고찰
 4. 결 론
 참 고 문 헌

• 강재은(낙동강유역환경청 측정분석과) | Jae-Eun Kang (Division of Monitoring and Analysis, Nakdong River Basin Environmental Office)
• 방진희(부산대학교 지구환경시스템학부) | Jin-Hee Bang (Division of Earth Environmental System, Pusan National University)
• 김유근(부산대학교 지구환경시스템학부) | Yoo-Keun Kim (Division of Earth Environmental System, Pusan National University) Corresponding author
• 오인보(울산대학교 의과대학 환경보건센터) | In-Bo Oh (Environmental Health Center, University of Ulsan College of Medicine)