|Characterisation Method Name:|
|Benzene impact on morbidity|
|Principal Method Name:|
|EPS: Global warming pathway|
The characterisation factor is determined by an equivalency method using CO2 as a reference.
The GWP100 was estimated by IPCC (Intergovernmental Panel on Climate Change) to 11 in one of the early reports. (1990). Later this
statement was withdrawn by IPCC, with the motivation that the uncertainty was too
large. In the EPS context however, omitting it would create a larger error than including
it, so the equivalency factor 11 will still be used.
Calculation of characterisation factor
As the characterisation factor of CO2 for morbidity is 6.55E–07 person-years/kg CO2
we obtain the pathway specific characterisation factor of benzene for severe
morbidity to 11*6.55E–07 = 7.21E–06 person-years/kg benzene.
|Steen B (1999b): A systematic approach to environmental priority strategies in product development (EPS). Version 2000 – Models and data of the default method CPM report Chalmers University of Technology Sweden|
|The residence time of benzene is in the order of days to weeks. As the regional background concentration of benzene in a rural area is low compared to the one measured in an urban area, the main contribution to the population dose occurs in urban areas close to the sources and within hours of release. The main source of benzene is cars and the gasoline fuel system. Gasoline contains several percent of benzene. This means that emissions occur worldwide and mostly at ground level. The environmental system is therefore global with a focus on urban areas. The temporal system border is the year 1990 for oxidant effects and for the cancer pathway and 100 years for the global warming pathway. The cancer pathway has a longer time scale, maybe in the order of 20 years, but the model is assuming linearity, why it does not make any difference for the model if an instant dose-response is assumed.|
|Characterisation Parameter||Category Indicator||Impact Indication Principle||Aspect||Substance||Quantity||Unit||Notes|
|Benzene||7.21E-06||p yr/kg||Global warming|