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12 Feb 2018ADMS NOx chemistry scheme implemented in AERMOD

A journal article by CERC authors describes the implementation of a NOx chemistry scheme in AERMOD which uses similar reactions and an analogous calculation method to the ADMS GRS chemistry. The new chemistry scheme, ADMSM, shows good performance when compared to measurements from five validation studies. The NO2 predicted by ADMSM has increased consistency with modelled NOx compared to the OLM or PVMRM approaches in AERMOD. The figure shows a comparison of predicted average hourly NO2 to NOx ratios against the observed value for cases where observed NOx ≥ 20 µg/m3; studies presented according to source-receptor distance (closest on left). The code development work carried out by CERC was funded by the American Petroleum Institute.

This work is cited in the recent US EPAWhite Paper on Planned Updates to AERMOD Modeling System”, and will be further evaluated as an alternative model for Tier 3 NO2 modelling in AERMOD.

References and links to more publications by CERC authors are available here while publications from other researchers using CERC models are listed here.

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5 Feb 2018Air quality modelling for the Barbican Low Emissions Neighbourhood

The City of London Corporation received funding from the Mayor of London to implement a Low Emissions Neighbourhood in the Barbican, Guildhall and Barts area. One of the LEN proposals included options for restricting access to Beech Street, which runs underneath the Barbican, to all but the cleanest vehicles.

The CERC Consultancy team worked with WSP to quantify the air quality impact of a number of different physical and emissions-based access restrictions for Beech Street. WSP provided traffic data for Beech Street and the surrounding roads for each scenario, taking into account the potential rerouting of restricted vehicles onto the surrounding roads. CERC used ADMS-Urban to model the impact of the changes to traffic flows on concentrations of NO2 in the surrounding area.

Beech Street is a covered road, with some sections completely covered and some partially covered. The effects of this complex layout on the dispersion of pollutants and chemical reactions was taken into account using the ADMS-Urban Advanced Street Canyon and Tunnels options and a NOx-NO2 correlation derived from local monitoring data.

The maps show the modelled annual average NO2 concentration and the change in annual average NO2 concentrations with Beech Street restricted to Low Emissions Vehicles.

25 Jan 2018ADMS-Urban, ADMS-Roads & ADMS-Airport 4.1.1 with EFT 8 available for download

ADMS-Urban, ADMS-Roads and ADMS-Airport incorporate the EFT emission factors so that emission rates can be calculated from available traffic and speed data. This release includes the new UK emissions factors from Defra's EFT 8. Details of the updates to the EFT are summarised in the EFT User Guide. Details of the model changes can be found in the What's New.

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

The updated release is available now from the User Area on CERC's website to users with current support.

For further information please contact us.

25 Jan 2018CERC at the recent Harmo18 conference in Bologna

David Carruthers and Amy Stidworthy recently attended the 18th Harmo conference in Bologna. This international conference aims to harmonise approaches to atmospheric dispersion modelling and model evaluation. They presented two papers: firstly on work using sensor data and inversion techniques to systematically reduce dispersion model error, including a Cambridge case study using CERC's ADMS-Urban dispersion model and AQMesh sensors; and secondly an evaluation of local and regional air quality forecasts for London, comparing CERC's local-scale airTEXT forecasts with regional-scale CAMS forecasts and monitoring data from the London Air Quality Network.

12 Dec 2017CERC research news

CERC conducts a wide range of environmental research and development projects. Recent work includes:

These are just some of the wide range of environmental research projects undertaken by CERC for local, national and international sponsors, collaborating with academic, government and commercial partners. Our research covers topics ranging from atmospheric dispersion, atmospheric chemistry, urban air quality, road traffic and emissions, to aviation, hazardous releases, wind energy, local climate and urban heat island modelling, the atmospheric boundary layer, model evaluation, and software development for web platforms and smart city applications.

For more information about our research, read our papers and publications, view our presentations, or contact us.

CERC's software user guides contain technical summaries of the scientific aspects of our software. More detailed scientific information is available in Technical Specifications for the ADMS 5, ADMS-Urban, ADMS-Roads and ADMS-Airport dispersion models and in published papers and reports.

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