Airport Carbon and Emissions Reporting Tool (ACERT)

Introduction ACERT
Publications Training  Events
ACERT v4.0 Do-it-yourself Airport Greenhouse Gas Inventory Tool
What is it?
ACI’s Airport Carbon and Emissions Reporting Tool (ACERT) is a self-contained Excel spreadsheet that enables an airport operator to calculate its own greenhouse gas (GHG) emissions inventory. The tool is available at no cost to airports and can be used without 
emissions or environmental expertise by inputting readily available operational data. 

Methodologies are consistent with the ACI Guidance Manual on Airport Greenhouse Gas Emissions Management (2009) and the GHG Protocol. Emissions are divided according to ownership and control of the source:
Scope 1 - emissions owned and controlled by the airport operator, such as electricity generation and airport vehicles.
Scope 2 - emissions from the off-site generation of electricity or heating/cooling purchased by the airport operator.
Scope 3 - emissions owned and controlled by airport tenants and other stakeholders including:
  • aircraft activity in terminal area,
  • airline and other tenant vehicles, ground service equipment (GSE) and electricity usage;
  • ground access vehicles (GAV) for staff and passengers including buses and trains.
Why use it?
In order to manage GHG emissions, an operator needs to understand the sources, quantities and ownership of emissions at the airport. An inventory can help the airport operator to set goals and target mitigation efforts. 

In addition ACI would like to use ACERT data to compile regional and global aggregate emissions, enhancing understanding of airports’ contribution to total aviation industry emissions.
Who can use it?
ACERT can be useful for:
  • airports with no dedicated environmental staff or budget for consulting fees; and
  • airports developing GHG management on a voluntary (non-regulated) basis.
Input for ACERT can be completed by operations, planning or maintenance staff with no emissions training or expertise.
How does it work?
Data are entered into a self-explanatory Excel spreadsheet. For the calendar year of the inventory, the following information is needed:
  • total aircraft, passenger and cargo movements;
  • fuel use by airport and tenant vehicles, buildings, emergency generators and fire training;
  • electricity (and heat) purchased by the airport operator and tenants;
  • aircraft movements categorized either by specific aircraft type, or by generic aircraft type, or total fuel loaded on to aircraft;
  • aircraft taxi and APU usage times and engine run-ups;
  • glycol de-icer use;
  • information on sewage and waste disposal;
  • either a detailed landside traffic study or estimates of passenger and staff ground access such as use of public transport, and car, taxi, bus and train activity; and
  • corporate travel by airport staff.
  • scope 1 and 2 offsets to calculate the remaining emissions or neutrality (3+)
What are the outputs?
ACERT automatically generates an inventory report (see sample extract in the ACERT flyer) that includes a summary table of GHG emissions, and pie charts. This stand-alone report also contains detailed notes on the assumptions and caveats and a check-list to aid review (not illustrated here).

In addition, version 4.0 will start providing you with the necessary information needed to transfer from ACERT to the Airport Carbon Accreditation Online Application Portal.
How good is it?
An ACERT inventory is of sufficient quality to help set up an airport GHG reduction programme. The tool has been tested at several major airports including Zurich, Toronto and SeaTac. Results indicate that ACERT Scope 1 and 2 emissions were within 5-10% of those from a more detailed inventory calculation.

Jaime Chema Navarro, Project Deputy Manager at the Pacific Airports Group (GAP) in Mexico, used ACERT for the airport in Puerto Vallarta. He said, “ACERT was really easy to use and helped to make the process for achieving Airport Carbon Accreditation both easier and cost effective. Because it is airport specific, it is ideal for a “do-it-yourself” scheme, without the support from consultants.”

ACERT v4.0 is especially designed to calculate emissions for all Levels of Airport Carbon Accreditation: 1 Mapping, 2 Reduction, 3 Optimization and 3+ Neutrality.

Airport Carbon Accreditation is the only airport-specific carbon management standard and is now available globally in all five ACI regions (

Version 4.0 features specific additional biofuels for vehicles and machinery; clarification of electricity data (additional information) and flow chart; calculation and result presentation of remaining emissions after offsetting, including ACA level 3+ neutrality; visual enhancements and additional help boxes; simplified data processing for output graphics; conditional input cell formatting as per ACA level; and, specifies ACA level on the output.

ACERT should not be used in place of any model required by local regulation.
Where can I get it?
ACERT is available for free by emailing (see, and support may also be provided.