Please use this identifier to cite or link to this item:
PIRA download icon_1.1View/Download Full Text
Title: Through-tunnel estimates of vehicle fleet emission factors
Authors: Brimblecombe, P
Townsend, T
Lau, CF
Rakowska, A
Chan, TL 
Močnik, G
Ning, Z
Issue Date: 2015
Source: Atmospheric environment, 2015, v. 123, p. 180-189
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.
Keywords: Black carbon
Carbon monoxide
Emission factor
Hong Kong
Ultrafine particles
Publisher: Pergamon Press
Journal: Atmospheric environment 
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2015.10.086
Rights: © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (
The following publication Brimblecombe, P., Townsend, T., Lau, C. F., Rakowska, A., Chan, T. L., Močnik, G., & Ning, Z. (2015). Through-tunnel estimates of vehicle fleet emission factors. Atmospheric environment, 123, 180-189 is available at
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Brimblecombe_Through-tunnel_estimates.pdf1.56 MBAdobe PDFView/Open
Open Access Information
Status open access
File Version Version of Record
View full-text via PolyU eLinks SFX Query
Show full item record

Page views

Last Week
Last month
Citations as of Jun 4, 2023


Citations as of Jun 4, 2023


Last Week
Last month
Citations as of Jun 8, 2023


Last Week
Last month
Citations as of Jun 8, 2023

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.