Abstract
PCDD/F emissions from three light-duty diesel vehicles – two vans and a passenger car – have been measured in on-road conditions. We propose a new methodology for small vehicles: a sample of exhaust gas is collected by means of equipment based on United States Environmental Protection Agency (U.S. EPA) method 23A for stationary stack emissions. The concentrations of O2, CO, CO2, NO, NO2 and SO2 have also been measured.Six tests were carried out at 90–100km/h on a route 100km long. Two additional tests were done during the first 10min and the following 60min of the run to assess the effect of the engine temperature on PCDD/F emissions. The emission factors obtained for the vans varied from 1800 to 8400pg I-TEQ/Nm3 for a 2004 model year van and 490–580pg I-TEQ/Nm3 for a 2006 model year van. Regarding the passenger car, one run was done in the presence of a catalyst and another without, obtaining emission factors (330–880pg I-TEQ/Nm3) comparable to those of the modern van. Two other tests were carried out on a power generator leading to emission factors ranging from 31 to 78pg I-TEQ/Nm3. All the results are discussed and compared with literature.
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