Toolkit for Identification and Quantification of Releases of Dioxins, Furans and Other Unintentional POPs
PART I General Guidance
Chapter 4 Data Quality
Source inventories and release estimates reported under Article 15 should be:
- Consistent over time,
- Comparable between countries,
- Transparent, and
Reliable inventories entail coherent application of internationally acknowledged methodologies such as the Toolkit and the use of best available national information.
To achieve consistency over time, the same approach should be used over time to establish consistent time trends.
To ensure comparability between countries, all countries should report according to the same source groups and source categorization.
For transparent estimates, the approach, methodology, information, and assumptions used should be clearly described, documented and archived to facilitate inventory updates in the future.
For complete release inventories, all relevant source categories, all sources within those categories and all relevant release vectors have to be considered in the whole country. The inventory should also include information on source categories that do not exist or are not operational in the country during the reference year.
The following quality assurance and quality control measures (QA/QC) should be applied to ensure that the source inventory and release estimates meet the quality criteria described above:
Possibilities of indicating the confidence in the data used to generate emissions estimates may be as follows:
Qualifiers may be applied to both emission factors and activity data to discern the overall confidence in the inventory’s results. Quality ranks are assigned to default emission factors by the Toolkit expert group to enable informed use of the methodology to assess PCDD/PCDF releases. Technical annexes provide complementary information on how default emission factors were derived to ensure that they are applied with the specified level of confidence only when matching a specific situation. Furthermore, guidance on assessing data quality criteria for calculating activity rates is provided in Annex 8.
More details on data quality and inventory QA/QC can be found in Part II Default Emission Factors.