From December 2014 to November 2015, an automatic weather system (AWS) was installed over a wide road of Daegu to continuously measure meteorological factors and surface temperature. We investigated the effective operating period of the clean-road system using the daily maximum and minimum air and asphalt surface temperatures, with the aim of creating an optimum thermal environment. The clean-road system was installed over a part of the broad way of Dalgubul(Dalgubul-Daero) by Daegu Metropolitan City in 2011. Until now, the clean-road system has been operated from the middle of April to the end of September. We assumed that it was desirable that the clean-road system could be operated when the discomfort index was above 55. In conformity with the conditions, we concluded that the optimum operation period of the clean-road system is from the end of March to about the middle of October.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 야외 관측 조사
  2.2. 연구방법
 3. 결과 및 고찰
 4. 결 론
 감사의 글
 REFERENCES

• 정응호(계명대학교 환경학부, Faculty of Environment, Keimyung University) | Eung-Ho Jung
• 노백호(계명대학교 환경학부, Faculty of Environment, Keimyung University) | Paik-Ho Rho
• 김해동(계명대학교 환경학부, Faculty of Environment, Keimyung University) | Hae-Dong Kim Corresponding author