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26 Feb 2018New CERC publications in the International Journal of Environment and Pollution

Two papers from CERC authors have recently been published in the International Journal of Environment and Pollution, as part of a special issue from HARMO17. The first paper (Stocker et al. 2017, doi 10.1504/IJEP.2017.10010380) concerns the review of dispersion modelling of agricultural emissions with non-point sources, using the ADMS and AERMOD models to examine dispersion of emissions from typical agricultural sources and a specific case study. This expands on work originally carried out for ADMLC. A figure comparing ADMS modelled and measured ammonia concentrations (µg/m3) is shown on the right.

The second paper (Smith et al. 2017, doi 10.1504/IJEP.2017.10010443) compares the standard approach to modelling NOx plume chemistry in ADMS to a more advanced methodology by presenting validation against data for two sites in Alaska. A novel graphical approach is used to distinguish between errors in dispersion calculations, which affect both NOx and NO2, and errors in chemistry, affecting NO2 only.

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


19 Feb 2018Air quality benefits of climate action in cities around the world

Representatives of nine cities from around the world analysed air quality and health benefits of climate actions in their cities at a workshop organised by C40, the leading global network of cities committed to addressing climate change.

At the workshop in London, from 7th to 9th November, experts from CERC, C40, Buro Happold and the London School of Hygiene and Tropical Medicine worked with representatives from Istanbul, Medellin, Quezon City, Quito, Mexico City, Buenos Aires, Hanoi, Athens and Karachi. The city representatives brought details of specific climate actions to which their city is committed, including tightening vehicle emissions standards, new public transport schemes, building solar energy generation plants and reducing industrial emissions. During the event CERC's Mark Jackson and Matt Williams provided expert guidance on air quality benefits of the actions. All nine cities were able to produce numerical estimates of benefits from their actions, including air quality concentration improvements and consequent improvements in life expectancy for the city populations, and the benefits of scaling up their actions to more ambitious targets.


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.

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