Airport Carbon Accreditation Australia | ACA Verification & Advisory

Airport Carbon Accreditation (ACA)

Airport Carbon Accreditation (ACA) is the global standard for managing and reducing airport greenhouse gas emissions.

Airport Carbon Accreditation Services

As a Level 5 approved verifier, I provide independent verification and technical support across all Airport Carbon Accreditation (ACA) levels, from Mapping through to Net Zero. My work ensures alignment with programme requirements and recognised international standards.

Verification Services

Independent verification provides credibility and integrity to ACA applications. Each engagement follows ISO 14064-3 and ACA verification protocols.

Services include:

Designing and reviewing greenhouse gas (GHG) inventories across scopes 1, 2 and relevant scope 3 categories

Reviewing emission factors, activity data and calculation methodologies
Assessing boundary definitions using relevant operational control criteria
Undertaking verification sampling, evidence review and assurance documentation
Evaluating recalculation procedures, data management systems and control processes

All verification work is undertaken in accordance with the current ACA Technical Manual, Verification Guidance and Emission Factors documentation, together with the 2025 ACA Communications that provide technical updates and clarifications issued by Airport Carbon Accreditation and Environmental Minds. These documents define the technical rules, reporting boundaries and evidence expectations for every level of accreditation, including Level 5 criteria and updated portal submission requirements.

Where required, ACA verification engagements can also be structured to support broader climate-related disclosure and assurance requirements, such as AASB S2 (Australia), NZ CS 1 to 3 (New Zealand) and IFRS S2-aligned frameworks in other jurisdictions.

Outcome: An independent, evidence based ACA verification report that confirms whether reported emissions, reductions and programme requirements have been met, and highlights key findings and improvement opportunities for future cycles.

Technical Advisory and Support

For airports preparing for accreditation or planning to progress to a higher level, I provide structured technical advice to improve data quality, strengthen evidence systems and support verification readiness.

Services include:

Undertaking gap analysis against ACA programme documentation, incorporating the current Technical Manual, Verification Guidance, Emission Factors publications and the latest ACA Communications that set out technical updates and clarifications
Modelling scenarios and assessing abatement potential to inform reduction pathways
Providing guidance on target setting and emission reduction planning
Developing or reviewing required documentation, including the carbon footprint, emissions management plan and stakeholder engagement summary
Designing data improvement plans and verification readiness assessments
Reviewing third-party data inputs and methodologies for scope 3 inclusion

Technical advisory services help airports remain fully aligned with the evolving ACA framework and documentation standards and reduce the risk of issues arising during verification. Support can also be coordinated with broader climate related disclosure work so that ACA outcomes are usable within corporate reporting and assurance processes.

Outcome: Verified and defensible ACA submissions that support compliance with programme and regulatory requirements and can withstand scrutiny from stakeholders, investors and regulators.

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Transparent Reporting for a Low-Carbon Future

We take disclosure from intention to delivery. Conversio helps you interpret, quantify, and report ESG and climate-related information so that you meet regulatory and stakeholder expectations, support assurance, and integrate outputs into day-to-day decision-making.

What levels of ACA can you verify and support?

I provide independent verification and technical advisory support across all ACA levels as a Level 5 approved verifier. All engagements follow the current ACA Technical Manual, Verification Guidance and Emission Factors documentation, together with the ACA Communications that set out technical updates and clarifications.

What standards do ACA verification assessments follow?

Each verification assessment is conducted against the ACA criteria and in accordance with ISO 14064-3 and ACA verification protocols, using the latest ACA technical documentation and emissions guidance.

Can ACA verification help with broader disclosure obligations?

Yes. Verification engagements can be structured to support AASB S2, NZ CS 1–3, IFRS S2-aligned reporting, and other emerging disclosure frameworks so your ACA data can also inform financial and sustainability reporting.

What is included in an ACA verification?

A verification reviews boundary definitions, data quality, evidence systems, recalculation procedures, control processes and scope 1, scope 2 and relevant scope 3 methodologies, in order to form an independent conclusion on your ACA application and reported emissions and supporting documentation.

How does technical advisory support improve ACA outcomes?

Advisory services strengthen data integrity, refine methodologies, model abatement opportunities, and assist with required documentation — ensuring submissions are defensible, compliant, and aligned with evolving ACA requirements.

Be Ready for Climate and ESG Reporting

Regulatory and stakeholder expectations are moving quickly. Put in place greenhouse gas, climate and ESG disclosures that are technically robust and suitable for assurance.