In this study, the condition of the hazardous materials in the bus was monitored according to the ventilation mode of the air conditioning system during bus service. The bus was surveyed using the indoor air quality measurement method of public transportation vehicles within one year of delivery. We evaluate the CO2 and PM10, which are the controlled parameters in buses by the Ministry of Environment, and VOCs and HCHO, the non-controlled parameters. The PM10 concentration increased due to outdoor air intake; however the CO2 concentration was found to decrease. In addition, the concentration of VOCs and HCHO was found to decrease due to the forced ventilation system and the outdoor air intake. These results show that the concentration of the other materials except PM10 can be changed due to the outside air concentration and forced ventilation system. Therefore, through indoor air quality characteristics of the bus according to air condition system are intended to be used as the basis of an operation manual.

Abstract
 1. 서 론
 2. 연구방법
  2.1 연구대상 및 조사기간
  2.2 대중교통 차량별 시료 측정 방법
 3. 결과 및 고찰
  3.1 규제물질
  3.2 미규제 물질
 4. 결 론
 References

• 안선민(평택대학교 생활 및 산업 환경 R&D센터) | Sun-Min An (Life & Industry Environmental R&D Center in Pyeongtaek University)
• 이정섭(국립환경과학원 생활환경연구과) | Jung-Sub Lee (Indoor environment and Noise Research Division, National Institute of Environment Research)
• 심인근(국립환경과학원 생활환경연구과) | In-Keun Shim (Indoor environment and Noise Research Division, National Institute of Environment Research)
• 김호현(평택대학교 생활 및 산업 환경 R&D센터, 평택대학교 ICT융합학부 ICT환경융합전공) | Ho-Hyun Kim (Life & Industry Environmental R&D Center in Pyeongtaek University, Department of Information, Communication and Technology Convergence, ICT Environment Convergence, Pyeongtaek University) Corresponding author