title: Characteristics of on-road NOxemissions from Euro 6 light-duty diesel vehicles using a portable emissions measurement system.
abstract: This paper presents the on-road nitrogen oxides (NOx) emissions measurements from Euro 6 light-duty diesel vehicles using a portable emissions measurement system on the predesigned test routes in the metropolitan area of Seoul, Korea. Six diesel vehicles were tested and the NOxemissions results were analyzed according to the driving routes, driving conditions, data analysis methods, and ambient temperatures. Total NOxemissions for route 1, which has higher driving severity than route 2, differed by -4-60% from those for route 2. The NOxemissions when the air conditioner (AC) was used were higher by 68% and 85%, on average, for routes 1 and 2, respectively, compared to when the AC was not used. The analytical results for NOxemissions by the moving averaging window method were higher by 2-31% compared to the power binning method. NOxemissions at lower ambient temperatures (0-5°C) were higher by 82-192% compared to those at higher ambient temperatures (15-20°C). This result shows that performance improvements of exhaust gas recirculation and the NOxafter-treatment system will be needed at lower ambient temperatures.
authors: Transport Pollution Research Center, National Institute of Environmental Research (NIER), 42 Hwankyeong-Ro, Seo-gu, Incheon 22689, Republic of Korea.
authors: Sangil
authors: S
authors: Kwon
authors: Transport Pollution Research Center, National Institute of Environmental Research (NIER), 42 Hwankyeong-Ro, Seo-gu, Incheon 22689, Republic of Korea.
authors: Yonghee
authors: Y
authors: Park
authors: Transport Pollution Research Center, National Institute of Environmental Research (NIER), 42 Hwankyeong-Ro, Seo-gu, Incheon 22689, Republic of Korea.
authors: Junhong
authors: J
authors: Park
authors: Transport Pollution Research Center, National Institute of Environmental Research (NIER), 42 Hwankyeong-Ro, Seo-gu, Incheon 22689, Republic of Korea.
authors: Jeongsoo
authors: J
authors: Kim
authors: Department of Physics, Namseoul University, Cheonan 31020, Republic of Korea.
authors: Kwang-Ho
authors: KH
authors: Choi
authors: Global Environment Research Division, National Institute of Environmental Research (NIER), 42 Hwankyeong-Ro, Seo-gu, Incheon 22689, Republic of Korea. Electronic address: js11cha@korea.kr.
authors: Jun-Seok
authors: JS
authors: Cha
keywords: Diesel vehicle; Euro 6 emissions standards; NO(x); On-road emissions; PEMS