Average concentration of PM in Seoul metropolitan area satisfied the Korean air quality standard in 2010. Furthermore, concentration of PM in all boroughs across Seoul met the air environment standard in 2012. PM10 concentration was relatively higher in center of Seoul in comparison to the rest, while PM2.5 concentration showed exactly the contrary result. We analyzed the effect that PM emissions from vehicles would have on PM concentrations across Seoul. The results showed that average annual PM concentration recently decreased in Seoul although the number of vehicles registered annually continued its upward trend. By contrast, average fine dust concentrations in Seoul showed a decline which suggested that correlation between annual average PM concentrations and number of registered vehicles remained low. However, year-on-year vehicle registration rate recently showed a declining tendency in the same way as the trend of changes in average PM concentrations. Particularly, the upward trend in annual average PM concentrations in 2002 and 2007 was consistent with the increase in vehicle registration rate, suggesting that vehicle registration rate was closely associated with changes in PM concentrations.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 자료
  2.2. 방법
 3. 결과 및 고찰
  3.1. 황사기간 포함 여부에 따른 연평균 PM10 농도의지역 분포 특성
  3.2. 연평균 PM2.5 농도의 지역 분포 특성
  3.3. 미세먼지 농도와 차량 등록수의 관계
 4. 결 론
 REFERENCES

• 박종길(인제대학교 환경공학과/대기환경정보연구센터) | Jong-Kil Park (Department of Civil and Environmental Engineering/Atmospheric Environment Information Research Center, Inje University)
• 최윤정(선일이엔씨) | Yun-Jeong Choi (SUNIL Engineering&Construction)
• 정우식(인제대학교 대기환경정보공학과/대기환경정보연구센터) | Woo-Sik Jung (Department of Atmospheric Environment Information Engineering/Atmospheric Environment Information Research Center, Inje University) Corresponding author