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Title: Through-tunnel estimates of vehicle fleet emission factors
Authors: Brimblecombe, P
Townsend, T
Lau, CF
Rakowska, A
Chan, TL 
Močnik, G
Ning, Z
Keywords: Black carbon
Carbon monoxide
Emission factor
Hong Kong
Ultrafine particles
Issue Date: 2015
Publisher: Pergamon Press
Source: Atmospheric environment, 2015, v. 123, p. 180-189 How to cite?
Journal: Atmospheric environment 
Abstract: On-road measurements of traffic-related gas and particle pollutant concentrations in three tunnels in Hong Kong and high resolution pollutant concentration profiles obtained while driving through the tunnels were used to derive the individual pollutant gradients using parametric and non-parametric (Sen-Thiel) slopes and compared with the commonly used entrance-exit two points calculation. The fuel based emission factors of measured pollutants for individual tunnels at different times of day were derived from gradients using a new method based on fuel carbon balance principle. Combined with the tunnel traffic volume and composition, the average tunnel emission factors were analyzed by linear regression to derive the diesel fleet emission factors. Average nitrogen oxides (NOx) and black carbon (BC) emission factor for diesel fleets are 29.3 ± 11.0 gNO2 kg-1 and 1.28 ± 0.76 g kg-1 of fuel, respectively. The results from the study were compared with the emission data from vehicle chasing approaches and the literature, showing reasonable agreement. Practical limitations and future direction for improvement of our method were also discussed. The method presented in this study provides a convenient drive-through approach for fast determination of tunnel and individual vehicle fleet emission factors. It can be used as an effective and fast approach to validate the emission inventory and to evaluate the effectiveness of policy intervention on the traffic emissions.
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2015.10.086
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