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CEN/TS 18275:2026

Ambient air - Definition and use of modelling quality objectives for air quality assessment

Edition date: 2026-07-08
In Force
Available languages: English
Summary: This document defines and describes the methodology to calculate Modelling Quality Indicators (MQI) and determine fulfilment of the Modelling Quality Objectives (MQO). MQO are provided to help ensure that modelling-based assessments of air quality in the context of the ambient air quality directive [1] are objective and comparable, and of sufficient quality to obtain reliable information about concentrations of air pollutants in ambient air. The method uses measurement uncertainty and a level of stringency as a benchmark for the acceptable level of difference between modelled and measured values. This document concerns the performance of an entire modelling system therefore the term “modelling quality objectives” is used rather than “model quality objectives”. This document concerns the use of modelling results for assessment as specified in [2]. Such modelling systems aim to capture both the spatial and temporal variability of the environmental indicator under assessment in the modelling domain. This document establishes a method to determine if the results of a modelling system fulfil the MQO and therefore reach an adequate data quality level within the modelling domain defined for assessment. The procedures described in this document are limited in scope as they concern only statistical performance indicators. A full evaluation of a modelling system considers additional elements of quality assurance, but such procedures are outside the scope of this document. This document only addresses modelling applications where measurements of pollutant concentrations are available that meet the data requirements for the validation defined in this document. This document specifies MQO that are applicable to all concentration ranges that may occur in ambient air. In the context of this document, MQI and MQO are specified for: - daily and annual averaged concentrations of particulate matter with aerodynamic diameter less or equal to 2,5 µm (PM2.5); - daily and annual averaged concentrations of particulate matter with aerodynamic diameter less or equal to 10 µm (PM10); - hourly, daily and annual averaged concentrations of nitrogen dioxide (NO2); - maximum daily 8-hour mean and seasonal averaged concentrations of ozone (O3); - hourly, daily and annual averaged concentrations of sulphur dioxide (SO2); - maximum daily 8-hour mean and daily averaged concentrations for carbon monoxide (CO); - annual averaged concentrations for benzene (C6H6); - annual averaged concentrations for lead (Pb); - annual averaged concentrations for arsenic (As); - annual averaged concentrations for cadmium (Cd); - annual averaged concentrations for nickel (Ni); - annual averaged concentrations for benzo[a]pyrene (BaP). This document addresses competent authorities, research institutions, consultants, or other bodies responsible for the performance of air quality modelling when applied for assessment purposes. NOTE Fulfilment of MQO is either normative or informative, depending on the quality of information used to determine the uncertainty parameters and stringency factors set out in this document.

Dieses Dokument definiert und beschreibt die Methodik zur Berechnung von Modellierungsqualitätsindikatoren (MQI, en: modelling quality indicators) und zur Bestimmung der Erfüllung der Modellierungsqualitätsziele (MQO, en: modelling quality objectives). MQO werden angegeben, um sicherzustellen, dass modellierungsbasierte Beurteilungen der Luftqualität im Rahmen der Richtlinie über Luftqualität [1] objektiv und vergleichbar sowie von ausreichender Qualität sind, um zuverlässige Informationen zu Konzentrationen von Luftschadstoffe in der Außenluft sind. Das Verfahren nutzt Messunsicherheit und Strenge als Maßstab für die akzeptable Differenz zwischen modellierten Werten und Messwerten. Dieses Dokument betrifft die Leistung eines gesamten Modellierungssystems, daher wird der Begriff "Modellierungsqualitätsziele" statt "Modellqualitätsziele" verwendet. Dieses Dokument betrifft die Verwendung der Modellierungsergebnisse für die Beurteilung, wie in [2] festgelegt. Solche Modellierungssysteme haben das Ziel, sowohl die räumliche als auch die zeitliche Variabilität des beurteilten Umweltindikators im Modellierungsbereich zu erfassen. Dieses Dokument legt ein Verfahren fest, um zu bestimmen, ob die Ergebnisse eines Modellierungssystems die MQO erfüllen, und somit ein angemessenes Datenqualitätsniveau innerhalb des zur Beurteilung festgelegten Modellierungsbereichs zu erreichen. Die in diesem Dokument beschriebenen Verfahren sind in ihrem Umfang eingeschränkt, da sie nur statistische Leistungsindikatoren betreffen. Eine vollständige Bewertung eines Modellierungssystems betrifft zusätzliche Elemente der Qualitätssicherung, diese Verfahren liegen jedoch außerhalb des Anwendungsbereichs dieses Dokuments. Dieses Dokument befasst sich nur mit Modellierungsanwendungen, bei denen Messungen von Schadstoffkonzentrationen verfügbar sind, die die Datenanforderungen für die in diesem Dokument festgelegte Validierung erfüllen. Dieses Dokument legt MQO fest, die auf alle in der Außenluft möglichen Konzentrationsbereiche anwendbar sind. Im Rahmen dieses Dokuments werden MQI und MQO für Folgende festgelegt: - tägliche und jährliche gemittelte Konzentrationen von Partikeln mit einem aerodynamischen Durchmesser kleiner oder gleich 2,5 µm (PM2,5); - tägliche und jährliche gemittelte Konzentrationen von Partikeln mit einem aerodynamischen Durchmesser kleiner oder gleich 10 µm (PM10); - stündliche, tägliche und jährliche gemittelte Konzentrationen von Stickstoffdioxid (NO2); - höchster täglicher 8-Stunden-Mittelwert und jahreszeitliche gemittelte Konzentrationen von Ozon (O3); - stündliche, tägliche und jährliche gemittelte Konzentrationen von Schwefeldioxid (SO2); - höchster täglicher 8-Stunden-Mittelwert und tägliche gemittelte Konzentrationen von Kohlenstoffmonoxid (CO); - jährliche gemittelte Konzentrationen von Benzol (C6H6); - jährliche gemittelte Konzentrationen von Blei (Pb); - jährliche gemittelte Konzentrationen von Arsen (As); - jährliche gemittelte Konzentrationen von Cadmium (Cd); - jährliche gemittelte Konzentrationen von Nickel (Ni); - jährliche gemittelte Konzentrationen von Benzo[a]pyren (BaP). Dieses Dokument behandelt zuständige Behörden, Forschungseinrichtungen, Berater oder andere Stellen, die für die Durchführung der Luftqualitätsmodellierung zuständig sind, wenn sie für Beurteilungszwecke angewendet wird. ANMERKUNG Die Erfüllung von MQO ist entweder normativ oder informativ, je nach Qualität der Informationen, die zur Bestimmung der in diesem Dokument dargelegten Unsicherheitsparameter und Strengefaktoren verwendet werden.
ICS: 13.040.20-Ambient atmospheres
CTN: CEN/TC 264 - 6245

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