10 Dec 20252025 ADMS User Group Meetings – presentations are available to download

Following this year's ADMS User Group Meetings, which took place in Bristol on 26-27 November, PDF copies of the presentations are now available to download from the CERC website User Area. Model users with a valid support contract, including all annual licence holders, are entitled to register for password-protected access to the User Area. To register, or to be reminded of your password, click here.

3 Dec 2025Major new release of GASTAR: dense gas dispersion model

GASTAR version 4.0 offers a major redesign for CERC's dense gas dispersion model, harmonising it with the ADMS family in layout and output formats.

GASTAR is typically used for modelling accident and emergency response scenarios and site safety involving releases of flammable and/or toxic materials from accidents such as cryogenic spills, catastrophic tank failure, pipe fractures and multi-phase jets.

New features include:

• An intuitive initial Setup screen for title, source material and all modelling options
• Simplified selection and management of the source material
• Output in CERC's .gst and .gtd formats, compatible with the 2-D plotter
• Support for drag-dropping files (input and output)
• Improved graph colours, symbols and font handling for the integrated line graphs

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

As usual with CERC models, the new version is backwardly compatible with earlier versions. 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.

21 Nov 2025Heathrow Airport expansion proposal: air quality sensitivity analysis

As part of the review of the Airports National Policy Statement (ANPS), the UK Government assessed Heathrow Airport expansion proposals produced by seven organisations. Two schemes remain under active consideration by the Government. For one of these, the Heathrow West scheme, promoted by Arora Group / Heathrow West Limited, CERC was part of a support team of specialist consultants engaged by Arora Group for their submission to the ANPS review. For the proposed expansion scheme, which includes a 2,800 m third runway, CERC's air quality analysis included:

• a semi-quantitative analysis of operational phase human health impacts;
• a qualitative analysis of relative potential effects at ecological receptors; and
• a further qualitative analysis of construction phase impacts.

As part of our analysis, we considered potential traffic disruptions during the construction of road schemes relating to airport expansion. These were based on disruption caused by current works for upgrading M25 Junction 10; the figure shows traffic speeds recorded for a section of the M25 before and during the works. This is an area of concern for which the Government has requested further information from promoters of the two remaining schemes. CERC's report is included as Appendix D of Arora Group's submission, with a summary of the air quality analysis in Section 10.

22 Oct 2025Amines chemistry module online training course offered by CERC

CERC are pleased to announce that we offer an updated online training course for ADMS, specifically for the amine chemistry module.

The course covers:

• Introduction to the atmospheric chemistry of amines and N-amine formation
• Overview of the amine chemistry scheme in ADMS
• Using the ADMS amine chemistry module
• The Amine Chemistry User Input Tool

More information about the course can be found here.

CERC's online training courses are extremely popular both in the UK and internationally. If you would like further information about the training courses offered by CERC, and how to book a place, please visit the training schedule on the CERC website, or email training@cerc.co.uk.

CERC are currently carrying out the Environment Agency Carbon Capture Atmospheric N Amines Formation Estimation Tools (CANFET) project. This involves gathering evidence on alternative models for estimating N-amines and devising and applying a methodology for model intercomparison.

CERC previously carried out another Environment Agency-led research project on amine chemistry modelling: Improving Post-Combustion Carbon Capture Air Quality Risk Assessment Techniques.

These and other aspects relating to the amines chemistry module will be covered at this year's ADMS 6 User Group Meeting in Bristol on 26^th November 2025.

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!