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ACRP Web-Only Document 63 |
A PRIMER
ICF
Reston, VA
Gresham Smith
Nashville, TN
Cascadia Consulting Group
Seattle, WA
RS&H
Jacksonville, FL
Deliverable for ACRP Project 02-97
Submitted May 2024

ACRP Web-Only Document 63
Airport Greenhouse Gas Emissions Inventory
A PRIMER
© 2024 by the National Academy of Sciences. National Academies of Sciences, Engineering, and Medicine and the graphical logo are trademarks of the National Academy of Sciences. All rights reserved.
ACKNOWLEDGMENT
This work was sponsored by the Federal Aviation Administration (FAA). It was conducted through the Airport Cooperative Research Program (ACRP), which is administered by the Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine.
COPYRIGHT INFORMATION
Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein.
Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, APTA, FAA, FHWA, FTA, GHSA, or NHTSA endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP.
Digital Object Identifier: 10.17226/27981
Epub ISBN: 978-0-309-72714-3
DISCLAIMER
The opinions and conclusions expressed or implied in this report are those of the researchers who performed the research. They are not necessarily those of the Transportation Research Board; the National Academies of Sciences, Engineering, and Medicine; or the program sponsors.
The Transportation Research Board does not develop, issue, or publish standards or specifications. The Transportation Research Board manages applied research projects which provide the scientific foundation that may be used by Transportation Research Board sponsors, industry associations, or other organizations as the basis for revised practices, procedures, or specifications.
The Transportation Research Board, the National Academies, and the sponsors of the Airport Cooperative Research Program do not endorse products or manufacturers. Trade or manufacturers’ names appear herein solely because they are considered essential to the object of the report.
The information contained in this document was taken directly from the submission of the author(s). This material has not been edited by TRB.


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Monique R. Evans, Director, Cooperative Research Programs
Waseem Dekelbab, Deputy Director, Cooperative Research Programs
Marci A. Greenberger, Manager, Airport Cooperative Research Program
Joseph D. Navarrete, Senior Program Officer
Stephanie L. Campbell-Chamberlain, Senior Program Assistant
Natalie Barnes, Director of Publications
Heather DiAngelis, Associate Director of Publications
Jennifer Correro, Assistant Editor
Philip A. Ralston, Portland, OR (Chair)
Khurram Qadri, City and County of Denver, Denver International Airport, Denver, CO
Akiya Simms, City and County of Denver, Denver International Airport, Denver, CO
Berrin Tansel, Florida International University, Miami, FL
Alan W. Strasser, FAA Liaison
Melinda Z. Pagliarello, Airports Council International–North America Liaison
Purpose of the Greenhouse Gas Emissions Inventory Primer
Why Prepare an Airport GHG Emissions Inventory?
How to Prepare an Airport GHG Emissions Inventory
1. Select and Apply GHG Protocols and Guidance Documents
1.1 Greenhouse Gas Protocol-Aligned Guidance
1.2 Airport Emissions in the Context of City Emissions
2.1 Set Organizational and Operational Boundaries
3. Collect Data and Estimate Emission Sources
3.1 Establish a Baseline GHG Inventory
3.2 Determine Inventory Methods
3.3 Collect GHG Inventory Data
3.5 Estimate Scope 1 Emissions
3.6 Estimate Scope 2 Emissions
3.7 Estimate Scope 3 Emissions
4.1 Prepare an Inventory Management Plan
4.2 Example Airport Inventory Management Plan

| ACA | Airport Carbon Accreditation |
| ACERT | Airport Council International Airport Carbon and Emissions Reporting Tool |
| ACRP | Airport Cooperative Research Program |
| APU | Auxiliary power unit |
| AR5 | IPCC Fifth Assessment Report |
| AR6 | IPCC Sixth Assessment Report |
| CAA | Clean Air Act |
| CCD | Cruise, climb, and descent |
| CH4 | Methane |
| CO2 | Carbon dioxide |
| CO2e | Carbon dioxide equivalent |
| eGRID | Emissions & Generation Resources Integration Database |
| EPA | U.S. Environmental Protection Agency |
| FAA | Federal Aviation Administration |
| GHG | Greenhouse gas |
| GJ | Gigajoule |
| GSE | Ground support equipment |
| GWP | Global warming potential |
| HFCs | Hydrofluorocarbons |
| IPCC | Intergovernmental Panel on Climate Change |
| kg | Kilogram |
| kWh | Kilowatt hour |
| LTO | Landing and take-off |
| MT | Metric ton |
| N2O | Nitrous oxide |
| NEPA | National Environmental Policy Act |
| PCA | Pre-conditioned air |
| SAF | Sustainable aviation fuel |
| SBTi | Science Based Targets Initiative |
| TCFD | Task Force on Climate-Related Financial Disclosures |
| U.S. | United States |
| VALE | Voluntary Airport Low Emissions Program |
| ZEV | Zero emissions vehicle |