2.6 QA/QC and Verification Methods

Last updated on 04 Dec 2014 08:38 (cf. Authors)


The Quality System for Emission Inventories and it´s contribution to UNECE-CLRTAP reporting

The German Quality System for Emission Inventories (QSE) originally was designed to serve the purposes of emission reporting under the UN Framework Convention on Climate Change (UNFCCC). It takes account of provisions of the IPCC (Intergovernmental Panel on Climate Change) Good Practice Guidance, of national circumstances in Germany and of the internal structures and procedures of the Federal Environment Agency (UBA), the reporting institution.
Thus it can be assumed that by adopting both IPCC Guidelines and Good Practice Guidance the UNECE-CLRTAP seriously facilitated the task of developing a QC/QA-System for the reporting of air pollutants. It is likely that all QSE procedures are flexible enough to be able to routinely incorporate these demands in the future as well.
The QSE is designed to cover all participants of the National System on Emissions (NaSE) which are mostly identical to those responsible for the reporting of air pollutants. Within the German Federal Environment Agency, the appliance of the QSE and it’s procedures has been made mandatory for UNFCCC reporting by an internal directive (UBA-Hausanordnung 11/2005). The adoption of the QSE´s approach will be useful for CLRTAP-reporting too but its implications have to be considered carefully, which is why the appliance of QSE procedures is partly outstanding. Currently few parts are used for reporting under CLRTAP, (see below, “Current State”).

The requirements pertaining to a system for quality control and quality assurance (QC/QA system) and to measures for quality control and quality assurance are defined primarily by Chapter 8 of the IPCC Good Practice Guidance.
From those provisions, the Federal Environment Agency derived "General minimum requirements pertaining to quality control and quality assurance in connection with greenhouse-gas-emissions reporting". It is assumed that these requirements completely apply for CLRTAP-reporting too. Therefore they are briefly given in the following to depict the necessary though partly outstanding trail of action for the development of a consistent QC/QA-System under UNECE-CLRTAP.

Main demands

The IPCC Good Practice Guidance requires that QC/QA systems be introduced with the aim of enhancing transparency, consistency, comparability, completeness and precision and, especially, that such inventories fulfill requirements pertaining to "good inventory practice". A QC/QA system comprises the following:

  • An agency responsible for coordinating QC/QA activities
  • Development and implementation of a QC/QA plan
  • General QC procedures
  • Source-category-specific QC procedures
  • QA procedures and
  • Reporting procedures
  • Documentation and archiving procedures

Agency responsible for coordinating QC/QA activities

A Single National Entity (national coordinating agency), is responsible for the QC/QA system. The German Single National Entity is established in the German Federal Environment Agency (UBA). In executing its function, it is good practice to establish the position of a coordinator for the Quality System to be developed. A QC/QA coordinator has responsibility for ensuring that a relevant QC/QA system is developed and implemented. Such implementation should be suitably institutionalised – for example, by means of an in-house directive or association agreement.

QC/QA plan

The purpose of a QC/QA plan is to ensure that QC/QA measures are properly organised and executed. It includes a description of all required QC/QA measures and a schedule for implementation of such measures. It also defines the primary emphasis of such measures.
Good practice calls for establishing a QC/QA plan and then reviewing and updating it each year after the latest inventory has been prepared.
On the basis of the results of annual inventory review, and of the results of QC/QA measures of which it is aware, the Single National Entity aims to prepare an improvement plan for the entire inventory. On this basis, in turn, it will then derive proposals for a binding inventory plan for the next year to be reported.

General quality control

Pursuant to the definition used by the IPCC (Chapter 8.1 Good Practice Guidance), quality control (QC) comprises a system of routine specialised measures for measuring and checking the quality of inventories in preparation.
Table 8.1 of the IPCC Good Practice Guidance includes a complete list of general QC measures. Requirements pertaining to general, Tier-1 QC procedures can be derived from the requirements mentioned in Chapter 8.6 of the IPCC Good Practice Guidance.
Required quality controls and their results should be recorded and not all quality controls have to be carried out on an annual basis. It should be ensured that all source categories undergo detailed quality control at least periodically.

Source-category-specific quality control

In addition to undergoing Tier 1 procedures, particularly relevant source categories (such as key sources), available resources presupposed, should undergo Tier 2 quality control with regard to determination of activity rates, emissions and uncertainties (cf. Chapter 8.7 Good Practice Guidance). The chapters of the IPCC Good Practice Guidance that pertain to the various individual source categories (Chapters 1 5) include additional information relative to source-category-specific QC measures. Such guidelines must be considered in preparation of a QC/QA plan.

Quality assurance procedures

While the primary aim of quality control is to ensure that methods are correctly applied, the primary purpose of quality assurance is to examine methods and data as such and improve or correct them as necessary.
Pursuant to the relevant IPCC definition (Chapter 8.1 Good Practice Guidance), measures for quality assurance (QA) are based "on a planned system of reviews by persons who are not directly involved in preparing the inventory. Such reviews – which are best carried out by independent third parties – should be applied to completed inventories, after QC procedures have been carried out
The required instrument for quality assurance is the peer review.

Reporting procedures

The Single National Entity is responsible for initiating, coordinating and globally organising reporting. Provision of data and reports by third parties must conform to applicable requirements pertaining to the scope, form and scheduling for such provision.

Documentation and Archiving

As a general requirement, all data and information used for inventory calculation must be documented (i.e. recorded) and archived, for each report year. The purpose of such documentation (i.e. recording) is to make it possible to completely reconstruct all emissions calculations after the fact. The general requirements pertaining to documentation and archiving for the entire process of preparation of the inventory are described in Chapter 8.10.1 of the IPCC Good Practice Guidance.
Consequently, data providers have the obligation to keep records information relative to data they supply to the Federal Environment Agency, for purposes of inventory calculations.
The types of quality control, the dates on which those measures were carried out, the pertinent results, and the corrections and modifications triggered by quality control measures should be recorded by the institution supplying the pertinent data.
Providers of emissions calculations have obligations to record the calculation methods and the rationale for their appliance. Calculation models, -files and -software, as well as the assumptions and criteria for the appliance of activity data and emission factors and their references have to be archived.
Moreoverthis quality assurance (QA) and confidentiality issues for data secrecy have to be archived.

Current state

Information regarding the Federal Environment Agency's current organisational measures for implementing the requirements given above is provided in the following.

Structural organisation - Role concept

Within the QSE framework, a concept for a start-up organisation was developed that defines binding responsibilities inside the Federal Environment Agency, for implementation of the necessary QC and QA measures. The purpose of defining roles and responsibilities is to facilitate the effective information exchange and the directive-conformal execution of QC and QA. The following roles are also used for reporting under CLRTAP (but are not yet established on a mandatory basis).

Specialised expert at the operational level (FV)
Source specific expert
Tasks: Activity-Data collection and entry.

Quality control manager (QKV)
Is the superior for the FV
Tasks: Checking and approving activity-data

Specialized contact person (source-category-specific, FAP)
Member of the Single National Entity
Tasks: Checking activity-data, Emission-Factor collection, entry and calculation. Preparation of texts, Facilitation of specialised and technical support (inventory work and reporting).

Report coordinator (IIRK)
Member of the Single National Entity
Tasks: Coordination of textual work. Establishing the Framework for preparation of the IIR from the various relevant contributions.

CSE Coordinator (ZSEK)
Member of the Single National Entity
Tasks: Ensuring the integrity of databases. Emissions reporting and data aggregation into report formats.

Current workflow management organisation

The workflow specified by the QSE is currently also used for activity data and additionally for emission factors in the agriculture sector (but not yet established on a mandatory basis). Moreoverthis parts of the adopted design are additionally altered to serve the purposes of CLRTAP-reporting at that early state. For example FV are currently responsible for activity data collection, entry and calculation and not also for collecting emission factors as is with the UNFCCC-Reporting.

Figure: QSE – Roles, responsibilities and workflow

General and Key-Source-category-specific quality control (QC)

The general and Key-Source-category-specific quality control of the QSE is already in force for Activity Data. This is due to the fact that all AD are the same as those used for UNFCCC-Reporting (except for the Handling of Bulk Products, because these AD aren’t used under UNFCCC). The quality of AD is supervised by the appliance of QC-Checks. The appliance of these QC-Checks (via special QSE-Checklists) is mandatory for all partcipants. The QSE-Checklists cover the complete set of general QC measures given by Table 8.1 of the IPCC Good Practice Guidance plus additional Tier-2-QC measures for key-source-category-specific quality control.
The QSE-Checklist are carried out annually throughout the whole inventory.

Quality assurance (QA)

Data, Methods and Estimates are generally derived by Staff (FV) who are not member of the Single National Entity (see "Structural organisation - Role concept"). The activities to be performed by FV, concerning quality issues, are related to QC only.

QA-tasks are to be performed by the following roles, starting with the QKV (internal QA). The tasks are given within the already mentioned QSE-Checklists. They build up on another and rely on reviewing and checking of finalized estimates and data. Each participant has it's own set of QA-Checks.
The FAP, as a member of the Single National Entity, is the first role that is not directly involved in preparing the AD (external QA). QA-independence is guaranteed henceforward.

The QA-Checks are carried out annually throughout the whole inventory. More intense peer reviews are undertaken when the need arises and then performed by national experts.
The QSE´s QA-procedures are already in force for Activity Data. This is due to the fact that all AD are the same as those used for UNFCCC-Reporting (except for the Handling of Bulk Products, because these AD aren’t used under UNFCCC).

Next section: 2.7 General Uncertainty Evaluation

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