Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Estimation of Air Pollutant Emissions for the Conversion of Diesel to CNG in the Busan Metropolitan Area

부산지역 경유버스를 CNG버스로 대체시 발생하는 대기오염물질 배출량 산정 및 변화 분석

  • Bang, Jin-Hee (Division of Earth Environmental System, Pusan National University) ;
  • Kang, Yoon-Hee (Division of Earth Environmental System, Pusan National University) ;
  • Song, Sang-Keun (Division of Earth Environmental System, Pusan National University) ;
  • Kim, Yoo-Keun (Division of Earth Environmental System, Pusan National University)
  • 방진희 (부산대학교 지구환경시스템학부) ;
  • 강윤희 (부산대학교 지구환경시스템학부) ;
  • 송상근 (부산대학교 지구환경시스템학부) ;
  • 김유근 (부산대학교 지구환경시스템학부)
  • Received : 2011.11.23
  • Accepted : 2012.01.31
  • Published : 2012.02.29
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Abstract

The emissions of several air pollutants ($NO_x$, CO, VOCs, etc.) for the replacement of all diesel buses by Compressed Natural Gas (CNG) buses were estimated in the Busan Metropolitan Area (BMA). These emissions were calculated from emission factors considering the different driving speeds with bus routes, distance traveled, and deterioration factors. For the purpose of this study, three categories of fuel type were selected: (1) the combination of diesel (65%) and CNG buses (35%) (DSL+CNG case), (2) all diesel buses (DSL case), and (3) all CNG buses (CNG case). The emissions of $NO_x$ and CO in the CNG case were estimated to be significant decreases (by about 50% and 98%, respectively) relative to the DSL case. Conversely, the emission of VOCs (980.7 ton/year) in the CNG case were a factor of 3.3 higher than that (299.8 ton/year) in the DSL case. In addition, the diurnal variations of emissions between two city buses (e.g. diesel and CNG) and all other vehicles were distinctly different because the two city buses operate at a regular time interval. Our overall results suggest the possibility that the pollutant emissions from the CNG buses can exert less influence on air quality in the target area than those from the diesel buses.

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