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MOBILE SOURCE EMISSION INVENTORY FOR THE CITY
OF CAPE TOWNDAPPS Report-back Meeting
Juliet Mert & Eugene Cairncross
Peninsula Technikon
27 November 2003
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OVERVIEW
DAPPS requirementsMethodology (Toolkit and Manual method)ResultsDiscussions/ConclusionAcknowledgements
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DAPPS Requirements
For mobile source emissions, DAPPS requires strip source emission rates of CO, HC, NOx, PM & SOx [g pollutant/s per strip].
The IPIECA Toolkit predicts total mobile source emissions in the CMA(i.e. a mobile source emission inventory).
A spreadsheet was setup in an attempt to determine temporal and spatial emissions.
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Methodology
TOOLKIT METHOD
• The IPIECA Toolkit is an emission inventory model, developed by IPIECA (UAQM)
• The model estimates emission rates based on: vehicle kms traveled, fuel consumption rates, annual human and vehicle population growth rates.
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Toolkit Results
Petrol consumed (kT/a) Diesel consumed (kT/a)
Modeled Est actuala Modeled Est. actual
1995 870 953 595 510
1998 972 1022 686 559
2001 974 971 691 609
Total Petrol and Diesel Consumption, Modeled vs Actual
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Total Lead emissions (kT/annum)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Year
Pb (k
T/a
)Particulate Matter emissions (kT/annum)
0
1
2
3
4
5
6
Year
PM (k
T/a
)
Total Car Gasoline non-catTotal Car Gasoline catTotal Diesel CarsTotal Motor- cyclesTotal Commercial vehiclesTotal Mobile Emissions
Hydrocarbon emissions (kT/annum)
0
5
10
15
20
25
30
35
40
Year
HC
(kT
/a)
Total Car Gasoline non-catTotal Car Gasoline catTotal Diesel CarsTotal Motor- cyclesTotal Commercial vehiclesTotal Mobile Emissions
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Base year [2001] Pollutant levels
0
10
20
30
40
50
60
70
80
90
PM SOx VOC NOx
Pol
luta
nts
[kT
/ann
um]
Base Year Pollutant Levels
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Methodology
MANUAL METHOD• Basis: vehicle counts (for the CBD), ave.
speeds, emission factors (EF) and route distances.
• Vehicle counts obtained from the Annual Vehicle Screenline Survey for Cape Town CBD (2001). Counts were done at 11 points in the City centre.
• Route distances were physically measured then sectioned into zones.
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City map
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Section of CMA map
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Study area boundary
Counting stations boundary
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Manual Results
Zone Average Distance
Speed (LV)
EF example of CO
CO emission/ annuma
Toolkit estimate
Differenceb
km km/hr g/km kT/annum kT/annum %
1 40 50 24 14.9 206 25
2 25 20 43 17.3 - -
3 24 15 51 19.3 - -
Total - - - 51.5 - -
aEmission = zone distance*vehicles/hour*EF [g/h]b60% of vehicles accounted for in CMA
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Discussion/Conclusion
• There is a good match between Toolkit total fuel consumption and fuel sales figures.
• The accuracy of estimated total and strip source emissions relies on valid assumptions, area boundaries and quality of data (such as vehicle counts).
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Acknowledgements
• CSIR• Pentech• SKR• SAWB• Naamsa, Sapia,
Sapref, City of Cape Town
*DAPPS is funded by the DACST’s Innovation Fund, administered by the NRF.