Journal
ATMOSPHERIC ENVIRONMENT
Volume 39, Issue 13, Pages 2499-2511Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2004.07.037
Keywords
statistical modeling; road traffic emissions; emission factors; tunnel measurements; real-world emissions
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Real-world emission rates of road traffic Can be quantified by measurements in road tunnels. Emission factors (EFs) of in-use vehicles can be determined and the impact of major changes in technology and fuel composition can be estimated. Here, we present tunnel measurements of nitrogen oxides (NO,), carbon monoxide (CO), and total volatile organic compounds (t-VOCs) performed in spring 2001 in the Lundby tunnel (Sweden), in fall 2001 in the Plabutsch tunnel (Austria) and in fall 2002 in the Gubrist tunnel (Switzerland). In this paper, we derive EFs for light and heavy duty vehicles (LDVs and HDVs) by the statistical method of linear and non-linear regression analysis. The results demonstrate the large effect of the tunnel road gradient for NO, emissions of HDVs, whereas the influence of the road gradient is less pronounced for LDV emissions of NO, and CO. The developed statistical modeling approach allows the determination of EFs as a function of vehicle speed. The results also indicate a dependence of the EFs on the day of the week, probably caused by differences in the fleet composition. © 2005 Elsevier Ltd. All rights reserved.
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