22 Sep 2025Clean Air Routes London: a new interactive map for healthier walking and cycling routes

CERC is proud to announce the launch of Clean Air Routes London, a free interactive map developed by Westminster City Council (WCC) and supported by Defra, designed to help people navigate London using routes with the best available air quality. Launched on World Car Free Day, the tool encourages people to walk or cycle while avoiding areas with high pollution levels. By entering a start and end point, users receive up to three route options ranked by air quality, helping them choose the healthiest journey.

Clean Air Routes London is underpinned by CERC's airTEXT air quality forecasting system, which uses our world-leading ADMS-Urban dispersion model to generate street scale forecasts for key pollutants including NO₂ and PM_2.5. The forecasts are updated twice daily and are calibrated using real-time air quality measurements. Under the project, CERC developed an API for WCC delivering near-instant results for walking and cycling routes across Greater London. The API ranks routes based on personal air pollution exposure, which is calculated using journey time, route geometry, and hourly airTEXT pollution data, allowing users to plan cleaner journeys up to three days in advance.

CERC has over 15 years of experience delivering air quality forecasting and alert services, including airTEXT, which serves over 22,000 subscribers across London and the South-East. Our expertise in air pollution modelling, software development, and cloud-based systems ensures that Clean Air Routes London is both scientifically robust and technically resilient.

Visit cleanairroutes.org to plan your next journey and discover cleaner, healthier routes across London!

16 Sep 2025CERC present research at the Harmo23 conference

CERC are presenting recent research studies at the upcoming 23^rd international Harmo conference (Harmo23), to be held in Hamburg, Germany, from 15^th to 19^th September 2025. This conference series is part of an initiative aimed at harmonising dispersion modelling for regulatory purposes.

CERC's Associate Director of Software, Dr Martin Seaton, will present key results from the Thermal Transport of Air Pollution from Regulated Industries (TAPRI) project, commissioned by the English Environment Agency's Chief Scientist's Group. CERC defined thermal flow types and their characteristics, and analysed meteorological, land use and topographical data for selected cases to better understand thermal flows and model their air quality impacts.

CERC Scientist Dr Victoria Hamilton will present results from CERC's work on an inter-comparison of methods for modelling deposition of ammonia from intensive farms.

CERC also contributed to a third presentation at the conference, relating to the project for RIVM on benchmarking nitrogen deposition models.

11 Sep 2025Draft agendas now available for the ADMS User Group Meetings, 26-27 November 2025, Bristol

There is still time to book your tickets for the 2025 ADMS User Group Meetings, which will be held at M Shed, Bristol on 26th and 27th November.

• ADMS 6 User Group Meeting, 26th November: view draft agenda
• ADMS-Urban and ADMS-Roads User Group Meeting, 27th November: view draft agenda

Tickets are available to order through Eventbrite until 23:30 on Monday 10th November. Organisations with a valid software support contract are entitled to one or more tickets free of charge depending on the type of licence held.

3 Sep 2025Major new release of ADMS-Urban, ADMS-Roads & ADMS-Airport 5.1

Version 5.1 is a major update of ADMS-Urban, ADMS-Roads and ADMS-Airport with many powerful new features to aid modelling, data processing and visualisation.

ADMS-Urban, ADMS-Roads and ADMS-Airport are comprehensive tools for investigating air pollution, taking account of complex urban morphology including street canyons and road tunnels.

ADMS-Roads is designed primarily for networks of roads that may be in combination with industrial sites, for instance small towns or rural road networks.

ADMS-Urban can model large urban areas providing output from street-scale to urban-scale.

ADMS-Airport has all the features of ADMS-Urban, and can also incorporate all relevant emission sources at airports including using algorithms designed specifically to model dispersion from aircraft engines.

New features include:

• Urban Canopy and Advanced Street Canyon Mapper tools for faster calculation of urban morphology parameters without requiring separate GIS software
• The latest emission factors from Defra's Emission Factor Toolkit, EFT 13.1
• A verification mode for checking model inputs and generating information about the model run
• A shape file (.shp) merging tool, including field adding, deleting and renaming
• Compatibility with ADMS 6 .apl files
• Plus many enhanced usability functions throughout the Mapper and interface.

All the new features are described in detail in the What's New? guides.

Users with support will get this version within the next few working days.

For further information on this release or any CERC products please contact us.

29 Aug 2025London Atmospheric Emissions Inventory 2022 released

The latest version of the London Atmospheric Inventory (LAEI 2022) has been published on the London Datastore. The LAEI 2022 includes traffic flow and emissions data for nearly 80,000 roads in the Greater London area as well as emissions data for all other sources of air pollution defined on a 1-km grid. Data are provided for a 2022 base year with projections to 2025 and 2030.

The latest release shows a 23% reduction in NO_x emissions between 2019 and 2022, largely driven by reductions in road transport emissions, with emissions forecast to reduce by a further 29% by 2030. PM_2.5 emissions have reduced by 6% over the same period, while PM₁₀ emissions in 2022 remain broadly similar to 2019 levels.

The comprehensive data available in the LAEI allows CERC to carry out detailed air quality modelling for a wide range of current and future cases including air quality forecasting and the assessment of the impacts of Low Traffic Neighbourhoods.

The Consultancy team's first project using the 2022 LAEI will be to assess progress towards the aim set out in the City of London Air Quality Strategy 2025-2030 for over 90% of the Square Mile to meet an annual mean of 30 µg/m³ for nitrogen dioxide by 2030.

We will use ADMS-Urban to model the impact of all emissions in London. The impact of the Central London's complex urban topography on road traffic emissions will be taken into account using the ADMS Advanced Canyon and Tunnels options. Non-road emissions will be modelled using grid sources. The resulting 1-metre resolution concentration maps will then be calibrated using local monitoring data.

CERC has carried out similar assessments for the City of London annually since 2018. One aim of the previous air quality strategy was for 90% of the Square Mile to meet the national air quality standard for annual mean NO₂ of 40 µg/m³ by 2025. Over the past seven years, changes have included the introduction of the Ultra Low Emissions Zone, new traffic restrictions at Bank Junction, and the introduction of the Beech Street Zero Emissions Street, as well as changes brought about by the Covid pandemic. The effects of all of these changes on emissions were incorporated into CERC's modelling. The modelling showed that the percentage of the Square Mile meeting the standard increased from 30% in 2018 to 93% in 2020, since when it has remained approximately constant.