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9 February 2001 Measurements with UV-DOAS in a street tunnel for validation of emission factors for road vehicles
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12 The emission behavior of road vehicles is usually estimated by application of emission factors and models. The validity of such factors or models in real world situations can be investigated by tunnel measurements, because road tunnels can be considered as big laboratories with well known boundary conditions. Tunnel experiments were carried out in the 10 km long Plabutschtunnel near Graz, Austria for a period of six weeks in November 1998 and another four weeks in May 1999. A UV- DOAS-system was operated in open-path mode located some 4 km inside the tunnel with pathlengths of 220 m to 430 m. To have an idea about the uniformity of the pollutant air mixture within the path, a comparison of NO2 measurements performed with a standard chemiluminescent analyser (point measurement) and the DOAS system (open-path measurement) was done. Therefore a standard air quality monitoring-system (AQM) in a container was installed in a niche inside the tunnel on one end of the DOAS path. The analysis of data showed good agreement of emissions derived from the measurements with the existing PC and HDV emission factors for CO. This was not the case for benzene and NOx emissions obtained from heavy duty vehicles.
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Johannes Rodler, Peter J. Sturm, and Bernhard Lechner "Measurements with UV-DOAS in a street tunnel for validation of emission factors for road vehicles", Proc. SPIE 4169, Sensors, Systems, and Next-Generation Satellites IV, (9 February 2001);

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