PD CEN/TS 18275:2026

This standard PD CEN/TS 18275:2026 Ambient air. Definition and use of modelling quality objectives for air quality assessment is classified in these ICS categories:

• 13.040.20 Ambient atmospheres

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.

PD CEN/TS 18275:2026 - Ambient Air Quality Assessment

Standard Number: PD CEN/TS 18275:2026

Pages: 48

Release Date: July 13, 2026

ISBN: 978 0 539 36117 9

Status: Standard

Overview

The PD CEN/TS 18275:2026 is a comprehensive standard that provides a detailed framework for the definition and use of modelling quality objectives in the assessment of ambient air quality. This standard is essential for professionals and organizations involved in environmental monitoring, policy-making, and air quality management.

Purpose and Importance

In today's world, where environmental concerns are at the forefront of global discussions, understanding and managing air quality is crucial. The PD CEN/TS 18275:2026 standard serves as a vital tool for ensuring that air quality assessments are conducted with precision and reliability. By defining clear modelling quality objectives, this standard helps in achieving consistent and accurate results, which are essential for making informed decisions regarding environmental policies and public health.

Key Features

• Comprehensive Guidelines: The standard provides detailed guidelines on how to define and use modelling quality objectives effectively.
• Enhanced Accuracy: By adhering to the objectives outlined in this standard, users can ensure higher accuracy in air quality assessments.
• Consistency in Assessments: The standard promotes consistency across different assessments, making it easier to compare and analyze data over time.
• Support for Policy Development: The insights gained from using this standard can significantly aid in the development of environmental policies and regulations.

Who Should Use This Standard?

This standard is designed for a wide range of users, including:

• Environmental Scientists: Professionals involved in studying and analyzing air quality data.
• Policy Makers: Government officials and organizations responsible for creating and implementing environmental policies.
• Environmental Consultants: Experts who provide advice and solutions for air quality management.
• Academic Researchers: Scholars conducting research in the field of environmental science and air quality.

Benefits of Using PD CEN/TS 18275:2026

Adopting the PD CEN/TS 18275:2026 standard offers numerous benefits, including:

• Improved Public Health: By ensuring accurate air quality assessments, this standard helps in identifying and mitigating health risks associated with poor air quality.
• Environmental Protection: The standard aids in the protection of the environment by providing reliable data for informed decision-making.
• Cost Efficiency: By promoting consistency and accuracy, the standard helps in reducing the costs associated with repeated assessments and errors.
• Global Relevance: As a recognized standard, it facilitates international collaboration and data sharing in the field of air quality management.

Conclusion

The PD CEN/TS 18275:2026 standard is an indispensable resource for anyone involved in the assessment and management of ambient air quality. Its comprehensive guidelines and objectives ensure that air quality assessments are conducted with the highest level of accuracy and consistency. By adopting this standard, organizations and professionals can contribute to a healthier environment and a better quality of life for all.