Report - DCE - Nationalt Center for Miljø og Energi

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&NJTTJPO GBDUPST
In the process of selecting the best reliable emission factors for the calculation
of the emissions from Danish vehicle fires, a range of different sources
have been studied. Unfortunately it is difficult to do an interrelated comparison
of the different sources because they all establish emission factors on
different assumptions and many of these assumptions are not fully accounted
for. Table 7.25 lists the accessible emission factors and their respective
references.
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PCDD/F has the best documented emission factor as eight sources were
found for this group of compounds. The Guidebook gives an emission factor
that is a factor 1000 lower than the other sources and Lönnermark et al.
(2004) and Lemieux et al. (2004) give factors that are a factor 1000 and
100,000 higher than the major of the sources respectively. There is a very
good compliance between the remaining five sources; Hansen (2000), UNEP
toolkit (2005), NAEI (2009), Blomqvist et al. (2002) and Schleicher et al.
(2004). Hansen (2000) is chosen as the source for the calculation of the
PCDD/F emission from vehicle fires.
Lönnermark et al. (2004) is the only available source to emission factors for
heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, Se, Zn). Lönnermark et al. (2004) is
also found to be the best available source to SO2 and NMVOC. Emission factors
from this source were derived by both small-scale and full-scale tests.
There are three sources to particle matter emission factors; the EMEP/EEA
Guidebook, Lönnermark et al. (2004) and Lemieux et al. (2004). The two latter
provides data of 38 and 50 kg per Mg combusted vehicle respectively.
The emission factor supplied by the Guidebook is given in kg per fire and is
therefore divided by the average weight of a passenger car in 2009, to give a
factor that is better comparable; the resulting emission factor is of 2.0 kg per
Mg.