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8 Nov 2021COP26: Verifying Glasgow's CO2 emissions using ADMS-Urban and measurements

Verification of carbon dioxide emissions is essential to achieving Net Zero and "keeping 1.5 alive". Researchers from CERC, Cambridge University, and ACOEM have collaborated on a project to verify CO2 emissions across greater Glasgow by combining measurements and CERC's ADMS-Urban air pollution dispersion model. The ongoing study, using available traffic data and emissions factors, suggests that CO2 emissions from road traffic around the region could be underestimated by up to 20%. These methods could be applied to verify the effectiveness of Net Zero policies for other cities.

From June 2021, fifteen AQMesh pods taking measurements of CO2 and other pollutants at 1-minute resolution have been co-located with Scottish Air Quality Network reference monitors at sites in Glasgow City, West Dunbartonshire, Renfrewshire and South Lanarkshire. From September 2021, two LI-COR reference-grade instruments have also been measuring CO2 at 1-minute resolution at two sites. ADMS-Urban has been applied to calculate hourly CO2 concentrations at the measurement sites for the period of the measurements using NAEI gridded emissions and DfT traffic flows, and allowing for the effects of street canyons. Road emissions within 2km of each monitoring site have been modelled explicitly as road sources; other road emissions have been modelled as 1kmx1km gridded emissions. Hourly background CO2 has been calculated from hourly baselines of the 1-minute AQMesh measurements calculated by the University of Cambridge team.

CERC researchers have applied Bayesian based inversion techniques to combine hourly modelled CO2 concentrations from ADMS-Urban with hourly averaged AQMesh and LI-COR CO2 measurements (top figure). The technique allows for the differences in uncertainties between low-cost sensors and reference monitors, for the uncertainties of the emissions from each source and for correlations between source emissions. The differences between the original and inversion-verified emissions (bottom figure) provide an indication of the accuracy of the original emissions inventory.

The project is funded by NERC and the Scottish Government.

12 Oct 2021CERC present at AQE Show and UKHSA Annual Review Meeting

This is a very busy time for CERC, presenting our research results to a wide range of audiences at key events this week.

The Air Quality and Emissions Virtual Event 2021 is being held on the 13th and 14th October. Speakers from government, academia and industry are presenting on a range of topics including national air quality monitoring and indoor air quality. Amy Stidworthy is presenting results from the application of CERC's Bayesian-based inversion methodology, which has been used to quantify the impact of COVID-19 restrictions on emissions in London by combining modelling and measurements. Read the abstract to Amy's talk and register for the free event.

The 2021 UK Health Security Agency (UKHSA) Annual UK Review Meeting on Outdoor and Indoor Air Pollution Research is being held online on the 14th October. This key national meeting of the UK’s experts in the field of air pollution and health research is aimed at academics, policy makers, directors of public health and health charities; topics covered include air pollutant exposure and the impact of using green cleaning products on indoor air quality. Dr Jenny Stocker is giving an overview of the development of MAQS-Health, CERC's world-leading coupled air quality modelling system that spans national to urban street scales and accounts for physical and chemical processes at all relevant temporal and spatial scales. MAQS-Health is being developed to facilitate the generation of outdoor air pollutant concentration datasets suitable for health research as part of the SPF Clean Air Programme. Read the abstract to Jenny's talk and sign up for the meeting by Tuesday 12th October.


11 Oct 2021CERC sponsor & present at Routes to Clean Air 2021

CERC are once again proud to sponsor the Institute of Air Quality Management's annual Routes to Clean Air 2021 conference to be held at Mercure Holland House, Bristol, on the 12th of October 2021.

The Routes to Clean Air conferences provide an opportunity for air quality, public health and transport professionals to share their experiences of improving air quality, particularly in urban areas. This year features an excellent selection of talks from top experts in air quality and related fields, including CERC's Dr Christina Hood presenting a talk entitled 'Modelling complex urban environments: Hong Kong'. Other topics to be discussed include urban Clean Air Zones, agriculture emissions, indoor air quality and materials emissions.

Speaker details, information on how to register and the conference programme can be found on the IAQM website here, and talks from previous years are also available.

CERC will also be exhibiting at the conference, so come and find us to discuss the range of software and consultancy services we provide, or just say hello.

27 Sep 2021Summer 2021 editions of ADMS Model Newsletters now available

Catch up on ADMS model news in the Summer 2021 editions of ADMS 5 & ADMS-Screen News and ADMS-Urban & ADMS-Roads News which are now available. The newsletters include the latest news about the ADMS models, the annual User Group Meetings, CERC activities, training courses and recently published papers as well as a page of useful modelling tips. Previous editions of the newsletters are available here.

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17 Sep 2021New review of odour emissions modelling with model intercomparison

Dispersion modelling plays an important role in the assessment of potential odour annoyance for planned activities and the investigation of complaints related to existing facilities. However, compared to general air pollution modelling there are particular challenges associated with modelling odour dispersion and exposure due to the importance of odour variations over short timescales to the perceived nuisance.

CERC's consultancy team, with Estonian, Latvian and Lithuanian Environment (ELLE) has carried out a Review of Approaches to Dispersion Modelling of Odour Emissions and Intercomparison of Models and Odour Nuisance Assessment Criteria. This review covers the technical approaches used for a variety of dispersion modelling methodologies applied to the assessment of odour nuisance, and summarises a wide range of odour assessment methods and criteria from different countries.

CERC's ADMS was used alongside AERMOD and AUSTAL2000 in a model intercomparison with four measurement datasets including: field odour inspections; field and wind tunnel tracer experiments; and continuous odour monitoring. Different odour criteria were compared, with a particular focus on the 98th percentile of hourly average concentrations and approaches involving concentration fluctuations and odour hours. Further discussion considers the effects of dose-response, suitable values of peak-to-mean concentration ratios, statistical methods and fluctuation models for predicting short-term odour impacts.

The work was funded by the UK Atmospheric Dispersion Modelling Liaison Committee (ADMLC) and the report is freely available here. CERC have previously led or contributed to ADMLC studies of near-field dispersion, non-point source dispersion, dispersion model sensitivity to source term parameters and urban dispersion. The reports for these studies and those by other authors on topics including dense gas dispersion and the ingress of external contaminants into buildings remain freely available.

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