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Development of a methodology for the quantification of particle number and gaseous concentrations in a bidirectional bus tunnel and the derivation of emission factors

Leschowicz, Stan, Jayaratne, Rohan, Morawska, Lidia, & Jamriska, Milan (2008) Development of a methodology for the quantification of particle number and gaseous concentrations in a bidirectional bus tunnel and the derivation of emission factors. Atmospheric Environment, 42(35), pp. 8353-8357.

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Abstract

Particle number, NOx and CO concentrations were measured simultaneously at the air entry portal and at the mid-point of a 511m bi-directional road tunnel, used entirely by urban public transport buses. The aim of this study was to provide information on concentrations of these pollutants inside a unique bus tunnel, and to develop a viable methodology for determining emission factors for on-road vehicles. Measurements were made continuously over a period of five days that included a complete weekend. Traffic flow rate and air flow rate were also monitored. The mean particle number concentration at mid-tunnel was 4.1 x 104 cm-3, which was over four times higher than the urban background concentration. The mean concentrations of NOx and CO at mid-tunnel were 464 ppb and 802 ppb, respectively. All these values were between 2 and 4 times higher than at the air entry portal. Median concentrations during selected time segments coinciding with the morning and evening rush hours, mid-day during weekdays and full day during the weekends were determined and the corresponding bus emission factors of each of the three parameters was calculated. Mean emission factors found for particle number, NOx and CO were 7.1 x 1014 particles km-1, 8.1 g km-1 and 15.9 g km-1, respectively. These values compared well with previous studies, showing that the methodology adopted was sound and viable.

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3 citations in Scopus
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3 citations in Web of Science®

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134 since deposited on 31 Oct 2008
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ID Code: 15400
Item Type: Journal Article
Keywords: Particle number, NOx, CO, road tunnel, buses, particle concentration, emission factors
DOI: 10.1016/j.atmosenv.2008.07.024
ISSN: 1352-2310
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Sciences not elsewhere classified (040199)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2008 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 31 Oct 2008
Last Modified: 29 Feb 2012 23:50

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