Emission Impossible Ltd

  • Dr Gerda Kuschel
  • Jayne Metcalfe
  • Lou Wickham
  • Rachael Nicoll
  • Surekha Sridhar

Dr Gerda Kuschel

Gerda is a chemical & materials engineer with more than 30 years’ experience working for a broad range of industries and organisations in New Zealand and Australia.  This has included the areas of air quality, climate, fisheries, aquaculture, mining, renewable energy, water quality and even a stint on Easter Island assisting with archaeological site restoration.

Gerda gained her Bachelor’s Degree in Chemical & Materials Engineering in 1985, worked for Shell BP and Todd as a process design engineer on Maui A Platform and the on-shore production station. In 1990, she returned to Auckland University to complete a PhD in Aluminium Smelter Technology for ALCOA of Australia.

Gerda then joined the National Institute of Water & Atmospheric Research (NIWA) for nine years, working as a researcher then Principal Scientist in urban air quality/climate and as Regional Manager – Auckland.  She left NIWA in 2004 to lead the team at Auckland Regional Council (ARC) on the implementation of the national environmental standards for air quality (the first such standards in New Zealand).  Following the finalisation of the Auckland air quality management strategy, Gerda set up the Environmental Sustainability team and was responsible for developing the Auckland region’s responses to climate change and energy.

In 2008, Gerda together with Jayne Metcalfe co-founded Emission Impossible Ltd – a consultancy specialising in improved management of air quality and vehicle emissions.  In 2012, she was the lead author of the Updated Health and Air Pollution in New Zealand (HAPINZ) study as well as the first national compliance strategy to meet the national environmental standards for air quality.  Since 2008 Gerda has been an independent professional advisor to the NZ Transport Agency and Ministry of Transport, as well as advising various regional councils on air quality management and environmental sustainability.

Gerda is a past President and Fellow of the Clean Air Society of Australia and New Zealand (a leading professional body for air quality and climate change practitioners in Australasia) and was a foundation board member of the Low Carbon Vehicle Partnership NZ initiative, which was set up to promote clean low carbon vehicles and fuels in New Zealand.  She has been on the board of the Environmental Protection Authority since 2018 and has been a decision-maker for various applications seeking to undertake activities in New Zealand’s Exclusive Economic Zone.

In addition to publishing more than 400 technical reports, good practice guides, briefing papers, submissions and articles on air quality and environmental sustainability, Gerda also has numerous publications promoting science and engineering as career options.  She has been actively involved in professional education and mentoring programmes for many years including the Training Activities Executive for the Clean Air Society of Australia and New Zealand and the Industry Advisory Board for the department of Chemical and Materials Engineering at Auckland University.


BE (Chemical & Materials)
PhD (Chemical & Materials)
Fellow and Life Member, Clean Air Society of Australia and New Zealand
Member, Resource Management Law Association
Member, Royal Society of New Zealand
Foundation Board Member, Low Carbon Vehicle Partnership NZ

Gerda's specialist areas are developing air quality policy, assessing health effects of air pollution, preparing regional land transport strategies, monitoring of vehicle emissions, undertaking cost-benefit analyses and assessing overall environmental effects of land transport emissions.

Jayne Metcalfe

Jayne is a chemical engineer with over 20 years experience in air quality including 13 years as an independent consultant and 9 years as an air quality officer and an air quality scientist at the Auckland Regional Council (1996-2005).

Jayne has been involved in air emissions management, research and modelling for most of here career. Some key projects have included:

  • Preparation of emission inventories for Ministry for the Environment, Auckland Council and Environment Canterbury
  • Various updates, technical reports and preparation of support material for the NZ Transport Agency’s Vehicle Emission Prediction Model
  • Modelling real world energy use projections for the Ministry of Transport’s Vehicle Fleet Emissions Model
  • Co-author of the updated Health and Air Pollution in New Zealand (HAPINZ) study in 2012

Jayne has extensive experience in air discharge consent processing, compliance monitoring and enforcement for all types of discharges to air including dust, odour and harmful pollutants. Some  recent experience includes:

  • Hearing commissioner on resource consent applications to continue to operate the Talley’s seafood processing complex, including fishmeal rendering, at Port Motueka.
  • Expert witness with respect to air discharges (for a Section 274 party) in the Environment Court appeal between Envirofume Limited and Bay of Plenty Regional Council (NZ EnvC 12-2017)
  • Primary author of the MfE Good Practice Guide for Assessing Discharges to Air from Industry (2008) and the 2016 update.
  • Co-author of the updated MfE Good Practice Guide for Assessing and Managing Odour (2016).
  • Expert witness with respect to odour discharges (for a Section 274 party) in the Environment Court appeal between Auckland Council and Craddock Farms (ENV-2015-AKL-000039)
  • Expert witness for the Auckland Regional Public Health Service submission on air quality to the Auckland Unitary Plan Independent Hearings Panel (2015)

Jayne is co-Director of Emission Impossible Ltd with Dr Gerda Kuschel.


BE (Chemical & Process)
ME (Chemical & Process)
Member, Clean Air Society of Australia & New Zealand

Jayne's specialist areas are undertaking and reporting on ambient air quality monitoring programmes, preparing emission inventories, modelling of motor vehicle and domestic heating emissions, and assessing discharges to air from land transport and industry.

Lou Wickham

With degrees in chemical engineering and environmental law, Lou is an air quality expert with a comprehensive understanding of both applied science and resource management. Lou has 27 years’ experience working for both private and public sectors in New Zealand, Australia and the United Kingdom on all aspects of air quality management including:

  • Local, regional and national air quality policy and regulation
  • Techniques and best practice for assessing the effects of discharges to air
  • Air pollution control
  • Odour control and assessment

Lou is an experienced presenter and has acted as an expert witness, Commissioner and Chair in numerous public hearings under the Resource Management Act 1991.


BE (Chemical & Materials)
MEL (Environmental Law)
Certified RMA Decision Maker

Louise's specialist areas are developing and implementing air quality policy to protect and improve public health, odour investigations, computer dispersion modelling, preparation of emission inventories and assessment of discharges to air from industry.

Rachael Nicoll

Rachael is a chemical engineer with nearly 20 years experience in the Resource Management Act and air quality. Rachael has previously worked for Auckland Regional Council and Metrowater.Rachael has been involved in all aspects of air quality management in New Zealand including resource consents, policy development, monitoring and modelling.

Rachael is helping the Auckland Council draft the Unitary Plan by providing specialist air quality and general policy advice.Recently Rachael wrote the Ministry for the Environment’s 2011 Users’ Guide to the Revised National Environmental Standards for Air Quality. Rachael also co-authored the partner document The National Air Quality Compliance Strategy to Meet the PM10 standard.


BE (Chemical & Materials)
Member, Clean Air Society of Australia & New Zealand

Rachael’s specialist areas are developing air quality policy and plans, assessing discharges from industry, and managing landuse and air quality conflicts.

Surekha Sridhar

Surekha is a geographer with ten years experience working in air quality and science areas. Surekha was employed by the Auckland Regional Council as an Air Quality Scientist for five years. During this time Surekha project managed the Auckland Air Emissions Inventory update and the development of the GIS database inventory toolkit.Surekha was also responsible for maintaining the Auckland air quality monitoring network datasets and metadata and managing the spatial realignment of Auckland’s air quality management area boundaries.

Prior to joining the Auckland Regional Council, Surekha worked as an Ecological Technician and Climate Research Assistant.


BSc (Geography)
MSc (Geography)
Member, Clean Air Society of Australia & New Zealand
Member, New Zealand Esri User Group

Surekha's specialist areas are utilising GIS applications to present environmental data, analysing census datasets and developing emissions models.