Emission Impossible Ltd

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

Dr Gerda Kuschel

Gerda is a chemical engineer with 30 years experience working for a broad range of industries including oil & gas processing, metal smelting, research & development, government agencies, and environmental consulting in Australasia.

Gerda was employed by NIWA for nine years as an air quality researcher and as the Principal Scientist/Group Manager for the Urban Air Quality/Climate team. In 2004, Gerda moved to the Auckland Regional Council where she worked as a senior technical specialist in Air Quality Policy before setting up the Environmental Sustainability team to coordinate Auckland’s response to climate change and energy issues. In 2008 Gerda set up Emission Impossible Ltd with Jayne Metcalfe.

Gerda is a past President of the Clean Air Society of Australia and New Zealand and has published more 300 technical papers and general articles on air quality and environmental sustainability.


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 19 years experience in air quality including 10 years with the Auckland Regional Council and six years as a private consultant.Jayne is one of New Zealand’s leading technical experts on vehicle emissions modelling being the lead developer of the Vehicle Emissions Prediction Model. Jayne is co-author of the Ministry for the Environment’s Good Practice Guides on Assessing Discharges to Air from Industry and from Land Transport.

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.

Louise Wickham

Louise is a chemical engineer with 20 years experience in air quality working for both private and public sectors in New Zealand, Australia and the United Kingdom. Louise was the Ministry for the Environment’s air quality specialist for over seven years during which time she assisted with the introduction, implementation and review of the national environmental standards for air quality.

Louise was the key Ministry contact for regulating wood burners and, in partnership with Environment Canterbury and Nelson City Council conducted the first national wood burner audit in 2006/07.

Louise’s industrial experience was gained as a consultant working in New Zealand, the United Kingdom and Australia. Major NZ consents include six Anchor milk processing facilities in the Waikato, National Can, AC Hatrix and Mobil NZ.


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.