To improve air quality around a broad way, Daegu Metropolitan city employed the clean-road system at a part of the broad way of Dalgubul (Daigubul-daero) in 2011. The clean–road system in general is operated two times (4 am, 2 pm) during summertime. In case of scorching alert, the system is operated 3 times a day (4 am, 2 pm and 4 pm). To evaluate the effect of air quality improvement due to the system, we analyzed the time variation of monthly mean particulate matter (PM10) concentration in recent 3 years (2011-2013). The improvement of air quality was estimated at about 5～15 % under the system.

Abstract
 1. 서 론
 2. 연구 자료와 방법
 3. 결과 및 고찰
  3.1. 최근 3년간 미세먼지 농도현황
  3.2. 클린로드 시스템 운영효과
 4. 결론
 감사의 글
 참고문헌

• 김성락(계명대학교 환경대학) | Sung-Rak Kim (College of Environment, Keimyung University)
• 정응호(계명대학교 환경대학) | Eung-Ho Jung (College of Environment, Keimyung University)
• 김해동(계명대학교 환경대학) | Hae-Dong Kim (College of Environment, Keimyung University) Corresponding author