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Characterisation Method Information
Characterisation Method Name:
Pb air emissions impact on severe nuisance in the world
Date Completed:
Principal Method Name:
EPS: brain effects pathway
Method Description:

The characterisation factor is determined by the empirical method.

Category indicator value in system considered

About 17% of the population in USA is estimated to have a decrease in IQ (A General Intelligence Quotient Score ) of three units in the beginning of the 90ies (Grant et al., 1993). Heavy car exhaust has mainly been a problem for OECD (Organisation for Economic Co-operation and Development) countries and some megacities outside OECD. This indicates that the problem is in the order of 100 million persons-years per year.

Contribution to category indicators value from a flow unit

The global lead emission was 344000 tons/year 1983 as estimated by Pacyna. (UNEP

Calculation of characterisation factor

This will result in a characterisation factor of 1E+08 /3.44E+08 = 0.291 person-years/kg Pb.
Literature Reference:
1. Grant. L and Elias, R., Symposium on Comparative Risk and Priority Setting of Air Pollution Issues, Keystone Colorado June 7-11, 1993. 2. UNEP Environmental data report 1991/92 p. 36, 1992.
Methodological Range:
The system considered is anywhere in the world during 1990.

Existing Characterisation Factors of Pb air emissions impact on severe nuisance in the world
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Severe nuisance EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
Pb 0.291 p yr/kg brain effects pathway