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Quantification of self pollution from two diesel school buses using three independent methods

Liu, L. J. and Phuleria, H. C. and Webber, W. and Davey, M. and Lawson, D. R. and Ireson, R. G. and Zielinska, B. and Ondov, J. M. and Weaver, C. S. and Lapin, C. A. and Easter, M. and Hesterberg, T. W. and Larson, T.. (2010) Quantification of self pollution from two diesel school buses using three independent methods. Atmospheric environment, 44 (28). pp. 3422-3431.

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Official URL: http://edoc.unibas.ch/dok/A5843002

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Abstract

We monitored two Seattle school buses to quantify the buses' self pollution using the dual tracers (DT), lead vehicle (LV), and chemical mass balance (CMB) methods. Each bus drove along a residential route simulating stops, with windows closed or open. Particulate matter (PM) and its constituents were monitored in the bus and from a LV. We collected source samples from the tailpipe and crankcase emissions using an on-board dilution tunnel. Concentrations of PM(1), ultrafine particle counts, elemental and organic carbon (EC/OC) were higher on the bus than the LV. The DT method estimated that the tailpipe and the crankcase emissions contributed 1.1 and 6.8 mug/m(3) of PM(2.5) inside the bus, respectively, with significantly higher crankcase self pollution (SP) when windows were closed. Approximately two-thirds of in-cabin PM(2.5) originated from background sources. Using the LV approach, SP estimates from the EC and the active personal DataRAM (pDR) measurements correlated well with the DT estimates for tailpipe and crankcase emissions, respectively, although both measurements need further calibration for accurate quantification. CMB results overestimated SP from the DT method but confirmed crankcase emissions as the major SP source. We confirmed buses' SP using three independent methods and quantified crankcase emissions as the dominant contributor
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Former Units within Swiss TPH > Environmental Exposures (Liu)
UniBasel Contributors:Liu, Lee-Jane S. and Phuleria, Harish Chandra
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Pergamon
ISSN:1352-2310
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 May 2018 09:57
Deposited On:26 Apr 2013 06:57

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