Development of the specific emission factors for buses in Hanoi, Vietnam

Nghiem, Trung-Dung; Nguyen, Yen-Lien T.; Le, Anh Tuan; Bui, Ngoc Dung; Huu, Tuyen Pham

doi:10.1007/s11356-019-05634-9

Environ Sci Pollut Res

2019

DOI: 10.1007/s11356-019-05634-9

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Development of the specific emission factors for buses in Hanoi, Vietnam

Trung-Dung Nghiem

Yen-Lien T. Nguyen

Anh Tuan Le

et al.

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Cited by 7 publications

(1 citation statement)

References 26 publications

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“…Table A2 present the fuel composition of test vehicles in this paper. bin12 bin34 bin56 [2,4) bin13 bin35 bin57 [4,6) bin14 bin36 bin58 [6,8) bin15 bin37 bin59 [8,10) bin16 bin38 bin60 [10,12) bin17 bin39 bin61 [12,14) bin18 bin40 bin62 [14,16) bin19 bin41 bin63 [16,18) bin20 bin42 bin64 [18,20) bin21 bin43 bin65 [20,22) bin22 bin44 bin66 [22,+∞) bin23 bin45 bin67…”

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confidence: 99%

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Mao

et al. 2020

Atmosphere

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Previous works on real-world vehicle emission characteristics have mainly focused on the influences of fuel, speed, vehicle type, elevation, and other factors on vehicle emission quantity and components. However, few studies have investigated the transient trend of automotive exhaust emissions through on-road measurements. The key objective of the present paper was to examine the transient characteristics of exhaust emissions from different vehicle types on the roads of Tianjin. To achieve the goal, a portable emission measurement system (PEMS) was employed to monitor emissions from selected test vehicles—private cars, passenger vehicles, and cargo vehicles. It was found that the high-emission points of test vehicles were mainly distributed in two regions: the high-speed region (speed > 70–90 km/h, vehicle-specific power (VSP) > 0 kW/t) and the medium-speed–acceleration region (20–30 km/h < speed < 60–90 km/h, 0 kW/t <VSP < 12 kW/t). The CO, hydrocarbon (HC), NOx, and particulate number (PN) average emission rates in the high-emission points could be 3.15–14.93 times, 1.93–24.89 times, 3.23–6.03 times, and 3.22–30.27 times of those of average emission rates. The HC, NOx, and PN average emission rates of China IV vehicles in the high-emission points were 2.46–4.92 times, 3.56–6.03 times, and 3.22–13.21 times of those of average emission rates, not less than those of China III (1.93–2.52 times, 2.75–3.90 times, and 9.98–22.34 times). Test vehicles mainly emitted nucleation-mode and Aitken-mode particles, and the increase of the PN concentration emission rate in low-speed and high-speed regions was higher than that in the medium-speed region. The exhaust gas recirculation (EGR) + diesel particulate filter (DPF) could effectively inhibit the Aitken output caused by turbocharged intercooler (CIC). The selective catalytic reduction (SCR) might cause more nucleation-mode particles.

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confidence: 99%

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Mao

et al. 2020

Atmosphere

View full text Add to dashboard Cite

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Exploring the influence of contributing factors and impact degree on bus emissions in real-world conditions

Wang

2021

Environ Sci Pollut Res

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Emission characterization and co-benefits of bus rapid transit: A case study in Hanoi, Vietnam

Nguyen

Nghiem

et al. 2021

Atmospheric Pollution Research

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Development of the specific emission factors for buses in Hanoi, Vietnam

Cited by 7 publications

References 26 publications

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Exploring the influence of contributing factors and impact degree on bus emissions in real-world conditions

Emission characterization and co-benefits of bus rapid transit: A case study in Hanoi, Vietnam

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