Denmark's National Inventory Report 2005 - Submitted under the ...

ues from Pulles & Aardenne 2001. The default uncertainties for emission factors are given in letter
codes representing an uncertainty range. It has been assumed that the uncertainties were in the
lower end of the range for all sources and pollutants. The uncertainties for emission factors are
shown in Table 3.15. The uncertainty for fuel consumption in stationary combustion plants was
assumed to be 2%.
Table 3.15 Uncertainty rates for emission factors
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01 10 20 50 20
02 20 50 50 50
03 10 20 50 20
3.2.3.2 Results
The uncertainty estimates for stationary combustion emission inventories are shown in Table 3.16.
Detailed calculation sheets are provided in Annex 3A.
The uncertainty interval for GHG is estimated to be ±11% and the uncertainty for the trend in
GHG emission is ±1.7%-age points. The main sources of uncertainty for GHG emission are N 2 O
emission (all plants) and CO 2 emission from coal combustion. The main source of uncertainty in
the trend in GHG emission is CO 2 emission from the combustion of coal and natural gas.
The total emission uncertainty is 7% for SO 2 , 16% for NO X , 38% for NMVOC and 43% for CO.
Table 3.16 Danish uncertainty estimates, 2003
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GHG 10,8 +11,1 ± 1,7
CO2 2,9 +10,1 ± 1,7
CH4 39 +330 ± 320
N2O 1000 +10,7 ± 3,4
SO2 7 -82,9 ±0,5
NOX 16 -26 ±2
NMVOC 38 46 ±15
CO 43 6,4 ±4,1
3.2.4 QA/QC and verification
The elaboration of a formal QA/QC plan started in 2004. A first draft QA/QC plan (in Danish) for
stationary combustion has been developed and this draft version is now applied as one of two
sector specific QA/QC cases. Adaptation to the general QA/QC plan will be performed in 2005.
The draft QA/QC plan for stationary combustion includes:
− Documentation concerning external data sources, including contacts, contracts with data supplier,
archiving and suggested QC.
− Compilation of the data for the emission database, including current QC and suggested QC
− Data input to the emission database, including information on whether the data transfer is
manual or not, current QC during and after data input, suggested QC.
− Emission inventory, including current and suggested QC of the emission inventory (consistency
and completeness)
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