C. John et al., Comparison of emission factors for road traffic from a tunnel study (Gubrist tunnel, Switzerland) and from emission modeling, ATMOS ENVIR, 33(20), 1999, pp. 3367-3376
The emission factors of NOx, VOC and CO of a road tunnel study performed in
September 1993 in the Gubrist tunnel, close to Zurich (Switzerland) are co
mpared with results of emission calculations based on recent results of dyn
amometric test measurements. The emission calculations are carried out with
a traffic emission model taking into account the detailed composition of t
he vehicle fleet in the tunnel, the average speed and the gradient of the r
oad and the special aerodynamics in a tunnel. With the exception of NOx emi
ssion factors for heavy duty vehicles no evidence for a discrepancy between
the results of the tunnel study and the emission modeling was found. The m
easured emission factors of individual hydrocarbons of light duty vehicles
were in good agreement with the expectations for most components. (C) 1999
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