Key Personnel


Geoffrey Walton (PhD, CEng, FIMMM, FIQ, FGS)

Chairman and Managing Director

Geoffrey Walton has a PhD in mining engineering from Nottingham University and was visiting professor of mining at Leeds University for 20 years from 1995. He worked for the NCB Opencast Executive as Headquarters Geotechnical Engineer, and in 1973 set up GWP a mine and quarry design consultancy. In 2004 he established DustScan Ltd - a spin-off company from Leeds University which in 2016 became DustScanAQ reflecting the growing importance of both dust and air quality in the firm’s work. He oversees a research based business working closely with academia and professional institutions to better serve industry.

Sue Radbourne

Director of Finance and Administration

Sue Radbourne has extensive experience in managing the day to day functions of SMEs. She joined DustScan Ltd in 2005 and is responsible for the internal administration and the organisation of financial and personnel matters. She is the internal financial controller having contacts with all clients, customers and suppliers.

Ayan Chakravartty (BEng, MSc, MPhil, CSci, MIEnvSc, MIAQM, MCIHT)

Technical Director

Ayan Chakravartty joined DustScan in 2016 as Principal Air Quality Consultant. He has experience in the field of environmental research and assessment within regulatory, academia and consultancy sectors. Ayan has an honours degree in Civil Engineering (Specialising in Transport and Geotechnical Engineering), and higher degrees in Transport Planning and Air Pollution; currently he is completing a PhD on air pollution health impacts at Newcastle University. His primary interests lie in transport planning and air quality impacts, but he also works on greenhouse gas, carbon and odour assessments. As Technical Director he steers the direction of technical development within the firm and has overall control of the consultancy work.

Oliver Puddle (BSc, CSci, MIEnvSc, MIAQM, MIQ, AFOH)

Senior Consultant

Oliver Puddle joined DustScan in 2006; he has an honours degree in environmental science from Portsmouth University and is an active member of the Institute of Air Quality Management and the British Occupational Hygiene Society. Oliver’s interests and expertise are in the monitoring, assessment and characterisation of fine particulate matter in ambient and workplace atmospheres. Much of his consultancy work covers workplace and occupational exposure surveys for COSHH assessments with associated reports covering items such as dusts (including RCS), VOCs and fumes (including DEEE). Oliver also manages the monitoring equipment stock, servicing and supply part of the business. His recent work includes inhalable dust exposure assessments for recycling plants and a baseline air quality assessment for construction works.

John Bruce (BSc, MIAQM, AMIEnvSc)

Senior Consultant

John Bruce joined DustScan in 2012; he holds a first class honours degree in environmental forensics and is completing a PhD on dust modelling at Portsmouth University. He works with the consultancy team on both dust and air quality matters and on related R&D and IT matters including empirical modelling techniques. John has published widely on dust monitoring and modelling. Some of his recent projects include air quality assessments for mineral planning applications.

Andrew Green (BSc, AMIEnvSc, AMIAQM, AFOH, AssocIScT)


Andrew Green joined DustScan in 2014; he holds a first class honours degree in Environmental Science from Portsmouth University. Andrew currently works on a range of dust, air quality and odour consultancy projects. He manages some of the firms laboratory activities (with Daniel Quinn) that use detailed analytical methods including Scanning Electron Microscopy and dust provenance detection methods. Andrew also assists with workplace/occupational exposure assessment work. His recent projects include air quality assessments for power plants and mineral sites and an odour assessment for a commercial kitchen.

Daniel Quinn (BA, MSc, AMIEnvSc, AMIAQM)


Daniel Quinn joined the firm in June 2015 with a BA in Earth Sciences from Trinity College Dublin and an MSc in Quaternary Sciences from Royal Holloway University of London. His primary consultancy work includes carrying out air quality and transport assessments. Daniel also supports with detailed dust characterisation and microscopy work. His recent projects include air quality and odour assessments for power plants and transport assessments for residential and commercial projects.

Eleanor Winning (BSc, MSc)

Graduate Consultant

Eleanor Winning joined the firm in September 2017. She has a first class honours degree in Geography and an MSc with distinction in Environmental Engineering at Newcastle University. Eleanor is involved with a range of technical activities assisting with routine analytical work and is working closely with Ayan Chakravartty to quickly develop her knowledge of transport and air quality assessments and related projects. Her recent project work includes air quality assessments for the residential, commercial and power sector, odour assessments and technical GIS work.

Nassim Azzout

Technical Officer (intern)

Nassim is a Geography student of Bournemouth University and joined the firm in August 2017 on a 12-month employment placement. Nassim is helping process incoming samples and assisting the firm's environmental scientists with a wide range of analytical work.

Tracey Volley

Technical Assistant

Tracey is responsible for the database cataloguing of incoming client samples, basic sample processing and the smooth operation of our daily courier arrangements.

Hugh Datson (PhD, CSci, MIEnvSc, MIAQM, FIQ, FGS)

Retained Consultant

Hugh Datson has a PhD from Leeds University’s School of Process, Environmental and Materials Engineering and a first class honours degree in geology and environmental sciences from Oxford Brookes University. He joined DustScan Ltd in 2004 and since then has been concerned with the characterisation of collected dust including optical microscopy and ICP-MS and with dust monitoring methods used in Dust Management Schemes and Dust Action Plans. Hugh has worked on various Good Practice and Technical Guidance Notes, on Air Quality Assessments and on their support in the planning process.

Dr Mike Fowler (MSc, PhD, CGeol, FGS, FRSC)

Retained Consultant

Mike Fowler is a Reader at Portsmouth University and has worked with DustScan since 2004. He is the analytical consultant to the firm being a senior geochemical specialist in geology, environmental sciences and environmental forensics and has played a significant role in establishing a geochemical basis to DustScan’s dust characterisation and research activities including PhD support.

DustScanAQ would be pleased to hear from you if you would like to discuss your requirements and how we can help you with your project, please contact us on 01608 810110 or email .