Report - DCE - Nationalt Center for Miljø og Energi

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confidentiality or that the amount of pollutants must be derived from products
wherein they are comprised. For other pollutants the amount is the sum
of the single pollutants DQG product(s) where they are included. The data
available in StatBank DK (2011) is obtained from Danish Customs & Tax Authorities
and they have not been verified in this assessment.
(iii) Distribution of pollutants on products, activities, sectors and households.
The present approach is based on amounts of single pollutants. To
differentiate the amounts into industrial sectors it is necessary to identify
and quantify the associated products and activities and assign these to the
industrial sectors and households. No direct link is available between the
amounts of pollutants and products or activities. From the Nordic SPIN database
it is possible to make a relative quantification of products and activities
used in industry, and combined with estimates and expert judgement
these products and activities are differentiated into sectors. The contribution
from households is also based on estimates. If the household contribution is
set too low, the emission from industrial sectors will be too high and vice
versa. This is due to the fact that the total amount of pollutant is constant. A
change in distribution of pollutants between industrial sectors and households
will, however, affect the total emissions, as different emission factors
are applied in industry and households, respectively.
A number of activities are assigned as “other”, i.e. activities that cannot be
related to the comprised source categories. This assignment is based on expert
judgement but it is possible that the assigned amount of pollutants may
more correctly be included in other sectors. More detailed information from
the industrial sectors is continuously being implemented.
(iv) Rough estimates and assumed emission factors are used for some pollutants.
For some pollutants more reliable information has been obtained
from the literature and from communication with industrial sectors. In some
cases it is more appropriate to define emission factors for sector specific activities
rather than for the individual pollutants.
A quantitative measure of the uncertainty has not been assessed. Single values
have been used for emission factors and activity distribution ratios etc.
0UIFS QPMMVUBOUT
The tier 1 uncertainties for other product use are shown in Table 5.11.