Research and analysis

Air quality compliance assessment 2025: modelled data and reports

Modelled data and reports to supplement the air quality compliance assessment 2025 under the Air Quality Standards Regulations (2010).

• From: Department for Environment, Food & Rural Affairs
• Published: 9 October 2026

Documents

CMAQ-Urban compliance modelling system: summary report

HTML

Arsenic annual mean 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Benzene annual mean 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Benzene roadside annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Benzo[a]pyrene (BaP) annual mean 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Cadmium annual mean 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Carbon monoxide daily max 8 hour 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Lead annual mean 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Nickel annual mean 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Nitrogen dioxide annual mean 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Nitrogen dioxide annual mean roadside hierarchy model 2025 GIS

ZIP, 10.8 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Nitrogen oxides NOx annual mean vegetation areas 2025 (1x1km) GIS

ZIP, 25.2 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone AOT40 2023 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone AOT40 2023 to 2025 average (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone AOT40 2024 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone AOT40 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone max 8hr days over 120 2023 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone max 8hr days over 120 2024 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone max 8hr days over 120 2023 to 2025 average (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Ozone max 8hr days over 120 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM2.5 annual mean 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM2.5 roadside annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM2.5 roadside natural source only annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM2.5 roadside natural source adjusted annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM10 annual mean 2025 (1x1km) GIS

ZIP, 85.4 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM10 roadside annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM10 roadside natural source adjusted annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

PM10 roadside natural source only annual mean 2025 GIS

ZIP, 10.7 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Sulphur dioxide winter mean vegetation areas 2025 (1x1km) GIS

ZIP, 25.2 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Sulphur dioxide annual mean vegetation areas 2025 (1x1km) GIS

ZIP, 25.2 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Sulphur dioxide 99.73rd percentile of hourly means 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Sulphur dioxide 99.18th percentile of daily means 2025 (1x1km) GIS

ZIP, 85.3 MB

This file may not be suitable for users of assistive technology.

Request an accessible format

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Details

The UK undertakes annual air quality assessments under the Air Quality Standards Regulations (2010).

The assessment compares measured and modelled air pollutant concentrations with the limit values, critical levels, target values and long-term objectives set out in the regulations.

This page publishes:

• modelled data used in the annual air quality assessment
• information about the CMAQ-Urban model

CMAQ-Urban is a new, more advanced national model that has been used for the first time in the 2025 compliance assessment. For more information about modelling methods and outputs, see Section 4 of  the methods for 2025 compliance assessment against Air Quality Standards Regulations (2010).

A full technical report on the modelling assessment methodology will be published in due course.

Find the:

• compliance assessment results and data tables - this includes the modelled data in more accessible formats for the general public
• overall results in the Air pollution in the UK 2025 report

Contact

If you require data in a different format, contact aqie.correspondence@defra.gov.uk.