Who's Who

Post holders

Bernard Fisher
Bernard Fisher MIAQM


Bernard Fisher is an environmental modeller with nearly 40 years research experience of air quality modelling. His career started in the power industry where he worked on acid rain. Between 1994 and 2000 he was Professor of Environmental Modelling at the University of Greenwich working on air quality management. Since joining the Environment Agency in 2000 he has been involved with the evaluation and use of environmental models with emphasis on air quality. He is a visiting professor at the University of Hertfordshire and a former Chair of the IAQM. He was elected the Institute’s first President in 2019.

Christine McHugh photo
Christine McHugh MIAQM


Christine is an independent air quality consultant with over 25 years’ experience, working for Keane & Gray. She previously worked for Arup where she led the UK air quality team, Amec Foster Wheeler and CERC. She has particular expertise in air quality modelling, emissions, forecasting, and airport air quality, having led air quality studies for several major UK airports. She has provided planning and other technical support to the Greater London Authority leading a comparison of London’s air quality with cities around the world. Christine provided training and expertise internationally, as the EU expert on air quality in the EU/China Liaoning Integrated Environment Programme, on projects for the European Space Agency, EU 7th Framework, and the European Commission. She was elected Chair in 2019.

Kieran Laxen

Vice Chair

Kieran is the Vice-Chair of IAQM and is a Director at Air Pollution Services. Kieran has over eleven years’ experience in the field of air quality. He has extensive experience of air quality assessments for residential and commercial developments, road schemes, waste management processes, industrial processes, power generation facilities, air quality monitoring and is a leading UK expert in the assessment of power generating facilities for both permitting and planning applications.


Vice Chair

Roger is an independent consultant, operating as Clear Air Thinking. After graduating in Physics & Meteorology, he worked at the Met Office, the Central Electricity Generating Board and ERM for 21 years (many as Technical Director and then Partner), contributing to UK and international EIAs, and policy studies for the UK government and the European Commission. Roger worked with RWDI for 2 years, where he made use of wind tunnels to simulate near-field dispersion around buildings. He is a Chartered Meteorologist and a Chartered Scientist.

Tom Reade

Chair of the Membership Committee

Tom is a Principal Air Quality Consultant at Hilson Moran, with 6-years professional experience. He has developed skills in sectors including property development, commercial and industrial premises, surface mine schemes, quarries, waste operations, and transport infrastructure. Tom is experienced in EIA and standalone AQ impact assessments for the protection of human health and ecosystems. He has undertaken numerous ambient air quality monitoring surveys using real-time and passive monitoring equipment. He is competent in air quality modelling packages (ADMS, DMRB and WEBTAG) and geographical information systems (MapInfo, ArcGIS and QGIS). He has an Air Pollution Management & Control MSc.

Rosalind Flavell

Chair of the Short-Course Endorsement Committee

Rosalind is a chartered environmental consultant with over 10 years of experience. She has extensive experience in the project management and production of environmental assessments for a wide range of clients and sectors, detailed dispersions modelling, baseline pollutant monitoring campaigns. She is fully conversant in environmental legislation, and guidance and has completed air quality assignments for projects ranging in size and complexity from initial screening of small scale developments to city wide option appraisals. Rosalind has provided support to Public Inquiries on projects with significant opposition relating to the potential impact upon air quality and human health, and has also worked as the air quality technical expert and attended the hearing for a national infrastructure planning application.

Ethny Childs


Ethny is Engagement & Communities Officer at the Institution of Environmental Sciences (IES). She is responsible for supporting the IES Communities and building relationships with partners and stakeholders in the sector. She is an ex officio member of the IAQM Committee and is the first point of call between the IES and IAQM. She previously completed the Charityworks Graduate Scheme and worked for a medical research funder which supported research into supporting healthy ageing. Ethny has a BSc in Biological Sciences with Management from Imperial College London and has a keen interest in wildlife and environmental conservation.

Honor Puciato


Honor is a Senior Consultant with over nine years of experience in public and private sectors, with a key focus on the Local Air Quality Management, the Environmental Impact Assessment (EIA) and Planning Process. Her work has covered a broad range of projects, including monitoring, evaluation of impacts from various local sources such as road traffic, on-site energy generation, odour and demolition and construction activities, as well as emission assessments and due diligence reviews of air quality reports and post-application advice. Outside work Honor is STEM Ambassador and a member of the Toastmaster International – Public Speaking Group, what shows her passion for effective communication and people engagement.

Other committee members

Emma Gibbons
Emma Gibbons MIAQM

Emma is a PhD student at the Institute for Environmental Design and Engineering, which sits within the Bartlett Faculty of the Built Environment at University College London. Her field of research is indoor air quality, and she is investigating the relationship between indoor and outdoor NO2 concentrations, and how building operation and ventilation practices influence indoor pollutant concentrations. Prior to her PhD studies, Emma was a senior consultant at Arup, and she has over 12 years experience in air quality consultancy. Emma has expertise in air quality dispersion modelling, design and implementation of air quality monitoring studies, technical review, local air quality management, indoor air quality and project management. She has worked with clients from a range of sectors including local authorities, government agencies, planning consultants, and from the rail, water, waste and construction industries. She is a full member of the IAQM and a chartered environmentalist.

Carl Hawkings
Carl Hawkings MIAQM

Carl started his working life at ERM in 1986 as an Ecologist. Sharing one of the few PCs in the London office with an air modeller he soon started helping out with modelling and air studies. He transferred to the air team between 1988-2000 when Carl joined ADM Ltd. Carl currently works with 3 main clients (Arup in the air quality team; Shell, in their major projects team and the World Bank in their Washington-based ombudsman team, as an air and EIA technical advisor). His air and EIA work involves him in many different sectors including transport, infrastructure, power, oil & gas, cement and incineration. He has worked in over 40 countries worldwide, most recently providing air quality management training in Iraq and managing EIAs in Nigeria, Qatar, UK offshore and Bangladesh. He managed the AQ team in Arup for a year during a staff leave of absence and has recent operational experience, covering for 4 months as the Environmental Manager on an oil seed rape plant in the UK. He has contributed to IAQM guidance and been a member since its formation.


Hugh works as an Environmental Dust Specialist with a passion for empirical, practical science. He works at the ‘coarser’ end of air quality science: visible, ‘nuisance’ or ‘disamenity’ dust, with particular interest in the extractive industries. For his PhD at the University of Leeds he validated the DustScan directional dust monitoring methodology. He has almost 15 years’ experience in environmental dust monitoring and assessment and maintains a close connection with DustScanAQ.

Sarah Horrocks MIAQM

After graduating from the University of Bristol with a degree in Chemistry, Sarah spent a year at NPL in the air quality standards team. After that she completed a Masters in Environmental Technology at Imperial College and subsequently found a job with Atkins. She is now the Practice Manager for Air Quality and recently celebrated 20 years at the company. As well as looking after and winning work for our 16 specialists, she is responsible for managing and delivering technical input to a wide range of markets: transportation, energy, water and land developments, in the UK and overseas. She is passionate about delivering high quality environmental work, and equally so about creating a working environment that is truly inclusive.

Xiangyu (Sian) Sheng MIAQM

Dr Xiangyu (Sian) Sheng is a leading expert in Air Quality and Climate Change with over 25 years’ experience. She has wide range of expertise in air quality modelling, odour, climate change, whole life cycle carbon assessment for large infrastructure schemes and urban development. She is a Director at Temple Group. Previously she worked at Capita/GL Hearn, Scott Wilson and CERC etc. She has been a technical lead for numerous high profile projects e.g. HS2, TfL, London 2012 Olympic Legacy, Brent Cross, Crossrail, 2008 Beijing Olympic, EU LIEP, EU-EMCP and EU EGP. Dr Sheng is a Fellow of the Royal Meteorological Society (FRMets), a Chartered Engineer (CEng), a Chartered Physicist (CPhys), and a Chartered Environmentalist (CEnv). She is a member of IAQM. Dr Sheng holds a BSc, BEng, MSc, MPhil and PhD. She has over 40 journal and conference publications. She published a book ‘Air Dispersion Modelling in Regulatory Applications’ in 2005.

Daniel Marsh
Daniel Marsh MIAQM

Daniel is part of the aerosol science team at the Environmental Research Group, Imperial College London, specialising in the control of dust and emissions from construction and demolition.

He is the programme manager for the Centre for Low Emission Construction, which aims to raise awareness of the air quality impacts from the construction industry, promote ‘best in class’ mitigation and emission reduction practices, and measure real-world emissions from construction machinery to enhance understanding, test the efficacy of reduction efforts and improve emission inventories. Daniel was the recipient of the 2016 Ian McCrae award for ‘Outstanding Work in Air Quality’.

Davide Pascarella MIAQM

Davide is a Principal Air Quality Officer at the RSP (Regulatory Services Partnership)serving the London Boroughs of Merton, Richmond upon Thames, Wandsworth and has over 15 years of experience in public sector. He has expertise on the Local Air Quality Management, Policies and Regulations. His work has covered a broad range of projects, managing monitoring networks, demolition and construction activities, writing bidding proposals as well as experience on reviewing air quality assessment reports submitted as part of the planning process. He is a full member of the IAQM and has an MSc in Environmental Analysis and Assessment.

Sam Pollard
Sam Pollard MIAQM

Sam is an air quality consultant with over 18 years’ experience of undertaking air quality assessments, both in the UK and abroad.  He has been responsible for managing and producing air quality assessments in support of large-scale infrastructure projects, highways schemes, oil and gas production operations and industrial, residential and commercial developments.  Sam is also highly experienced in developing and assessing air quality mitigation measures, including Clean Air Zones, and has led numerous such studies on behalf of local authorities.  He has also managed and contributed to a number of air quality research projects undertaken on behalf of Defra and Highways England.

Chuansen Ren MIAQM

Chuansen has over 20 years’ experience in the discipline of air quality and atmospheric science as a researcher or a consultant, serving clients in both public and private sectors. He is competent in assessing and quantifying emissions to air and their potential and actual impacts, including vehicle exhaust emissions, industrial emissions, landfill emissions, odour and dust. He provided consultancy services for clients in the oil and gas, transportation, urban development, waste, process industry, mining and agricultural sectors. He is happy to share knowledge, to help others and to learn new skills.

Chris Rush
Chris Rush MIAQM

Chris is a Consultant and Air Quality Group Lead at Hoare Lea. His diverse portfolio of experience includes air quality assessments on a range of projects from initial site feasibility, through planning and development to construction and operation. Along with work at the planning stage, including Environmental Impact Assessments, he has recently been involved in the testing and assessment of indoor air quality (IAQ) and furthering understanding of how building design contributes to IAQ in the detailed design states and operation. He has previously been closely involved with the IAQM Early Career Group Committee and organising a number of well-attended discussion meetings in Manchester. He is a Chartered Environmentalist and has an MSc in Air Pollution Management and Control.

Duncan Urquhart
Duncan Urquhart MIAQM

Duncan is a consultant with 15 years’ experience with AECOM, originally based in London and then in Yorkshire.  He is a project manager and technical specialist, focussing on local air quality management and vehicle emission modelling, as well as experience managing monitoring networks and occupational hygiene.  He has worked for numerous regional and local authority clients to undertake Local Air Quality Management and strategic appraisal studies, including assisting with the implementation of Air Quality Action Plans and Clean Air Zone feasibility.  He is currently working with a remit for innovation and identifying opportunities to use new technology and data, and how this can support a holistic approach to improving air quality.