Linking in-vehicle ultrafine particle exposures to on-road concentrations

Hudda, Neelakshi, Eckel, Sandrah R., Knibbs, Luke D., Sioutas, Constantinos, Delfino, Ralph J. and Fruin, Scott A. (2012) Linking in-vehicle ultrafine particle exposures to on-road concentrations. Atmospheric Environment, 59 578-586. doi:10.1016/j.atmosenv.2012.05.021

Author Hudda, Neelakshi
Eckel, Sandrah R.
Knibbs, Luke D.
Sioutas, Constantinos
Delfino, Ralph J.
Fruin, Scott A.
Title Linking in-vehicle ultrafine particle exposures to on-road concentrations
Journal name Atmospheric Environment   Check publisher's open access policy
ISSN 1352-2310
Publication date 2012-11
Sub-type Article (original research)
DOI 10.1016/j.atmosenv.2012.05.021
Volume 59
Start page 578
End page 586
Total pages 9
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
For traffic-related pollutants like ultrafine particles (UFP), a significant fraction of overall exposure occurs within or close to the transit microenvironment. Therefore, understanding exposure to these pollutants in such microenvironments is crucial to accurately assessing overall UFP exposure. The aim of this study was to develop models for predicting in-cabin UFP concentrations if roadway concentrations are known, quantifying the effect of vehicle characteristics, ventilation settings, driving conditions and air exchange rates (AER). Particle concentrations and AER were measured in 43 and 73 vehicles, respectively, under various ventilation settings and driving speeds. Multiple linear regression (MLR) and generalized estimating equation (GEE) regression models were used to identify and quantify the factors that determine inside-to-outside (I/O) UFP ratios and AERs across a full range of vehicle types and ages. AER was the most significant determinant of UFP I/O ratios, and was most strongly influenced by ventilation setting (recirculation or outside air intake). Further inclusion of ventilation fan speed, vehicle age or mileage, and driving speed explained greater than 79% of the variability in measured UFP I/O ratios.
Keyword Ultrafine particles
Air exchange rate
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Public Health Publications
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Created: Mon, 07 Jan 2013, 09:07:38 EST by Luke Knibbs on behalf of School of Public Health