Airport Carbon Accreditation Services

Get effective advice on measurement, reporting and verification requirements.

Conversio is a Brisbane-based carbon accounting and reporting consultancy. We support you by providing carbon footprinting and verification services for your airport’s Airport Carbon Accreditation (ACA).

As one of only few approved ACA program verifiers in Australia, Director Alex Stathakis underwent dedicated training and complies with the specific requirements set by the ACA program administrator. 

What is Airport Carbon Accreditation? 

Airport Carbon Accreditation (ACA) is a voluntary carbon management certification for airports, endorsed by both the European Civil Aviation Conference and EUROCONTROL and formally supported by the European Commission, the UN Environment Program and the International Civil Aviation Organization. The program assesses and recognises continual performance improvements in carbon and energy management by airports.

The program offers four levels of certification: 

Level 1– Mapping 

Level 1 accreditation requires the airport to have a policy commitment to emission reductions, as well as a carbon footprint of scope 1 & 2 emissions. 

Level 2 – Reduction 

At Level 2, airports need to start thinking about managing and reducing their carbon footprint. To become accredited, airports need to fulfil all Level 1 requirements, formulate an emissions reduction target, demonstrate emission reductions, and develop a carbon management plan. 

Level 3 – Optimisation 

Level 3 includes all the requirements of Level 1 and Level 2, and expands the scope to engaging your tenants and other stakeholders, and measure their carbon emissions (scope 3), including the Landing and Take-off (LTO) cycle of aircraft. 

Level 3+ – Carbon neutrality 

At Level 3+, all requirements of Levels 1, 2 and 3 must be met. Additionally, an airport will need to demonstrate a scope 3 emission reduction, as well as offset its scope 1 & 2 emissions and emissions associated with business travel. 


As part of the ACA application process, each airport’s carbon footprint and, according to the accreditation level chosen, the airport’s carbon management and stakeholder plans, must be independently verified by a third party before consideration by the program administrator. Ensuring transparency, completeness and accuracy is crucial. An independent verification by us provides confidence to you and your stakeholders that the reported information, statements, and plans represent a faithful, true, and fair account of your airport’s efforts. We conduct verifications in accordance with ACA requirements, ISO 14064-3 and the GHG Protocol. 

Collaborative Environmental Management for Level 3 and 3+

The Collaborative Environmental Management (CEM) approach is recognised as supporting evidence for ACA Levels 3 and 3+. CEM was developed to support operational airport stakeholders in their efforts to reduce greenhouse gas and noise emissions, as well as improve local air quality and to find a common approach to dealing with the environmental challenges they face at and around airports. Conversio can guide you through the process of setting up a CEM.

Carbon footprinting

In addition to our verification services, Conversio can also support your airport in establishing a carbon footprint using the Airport Carbon and Emissions Reporting Tool (ACERT) or the Australian National Greenhouse and Energy Reporting Scheme (NGERS), and in accordance with the requirements, recommendations and guidance set out under ISO 14064-1 and the GHG Protocol. We can take you through the ACERT process and explain how NGERS applies to your airport.

Our ACA clients: 

  • Adelaide Airport, Level 3  
  • Parafield Airport, Level 3 
  • Christchurch International Airport, Level 2
  • Perth Airport, Level 1 
  • Hobart Airport, Level 1 
  • Melbourne Airport, Level 1 
  • Nadi International Airport, Level 1 
  • La Tontouta Airport, Level 1 
  • Gold Coast Airport: carbon footprint services for participation at Level 1 

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