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1 CHAPTER 1 Introduction and Background This Guidebook is intended to provide concise instruc- the calculation methods in Chapter 3. The overall procedure tions primarily to airport operators on how to develop an for developing an inventory is shown in Figure 1-1. airport-specific greenhouse gas (GHG) emissions inventory. First-time users of this Guidebook should follow each of Instructions are provided to guide the user in developing ap- the steps shown in Figure 1-1 to become accustomed to the propriate and consistent inventories. Rather than burden the theories and materials in each chapter. After that, Step 2 body of the Guidebook with too much detail, much of the de- (Chapter 2) could essentially be the starting point. tailed background information supporting the suggestions in the Guidebook is provided in the appendices that serve as a companion to the Guidebook. Every attempt has been made First-time users of this Guidebook should follow to keep the Guidebook simple to use and, thus, the Guidebook each of the steps shown in Figure 1-1 to become accustomed to the theories and materials in each relies on the appendices for greater elaboration and support for chapter. the methods. Many airport operators prepare an air quality protocol before embarking on the development of an inven- tory (protocols refer to documents that identify data sources 1.1 Purpose of the Guidebook and methodologies to be deployed in an analysis.). This Guide- book is not intended to replace such protocols, but rather serve Currently, the United States has no national or state leg- as a reference point for various methods. islative mandates for an airport operator to prepare GHG With clarity and conciseness in mind, the Guidebook is emissions inventories. Generally, the few inventories that organized to provide first a brief introduction and limited have been generated by or for airports have been done vol- background information in this chapter (Chapter 1). The untarily, even though they may be based on requests from chapter reviews issues associated with airport GHG inven- municipalities. Such voluntary actions have been conducted tories which the user should consider before embarking on in response to state and local climate action initiatives or, preparing an inventory. Then Chapter 2 provides directions in the case of two inventories (for airport improvements at for developing inventories, covering the protocols neces- Sacramento International Airport and San Diego Interna- sary for properly setting up an inventory. This is followed tional Airport), were prepared in response to the California by instructions in Chapter 3 on how to calculate emissions Environmental Quality Act (CEQA) analysis of proposed air- from each source and how to create carbon dioxide (CO2) port improvements. With no national legislative mandates, equivalencies. there is also no clear guidance on developing airport-specific inventories. As is shown in Appendix F of this report, airport GHG inventories differ in their approaches. Chapter 2 represents the heart of the inventory To fill this need, TRB initiated Project 02-06 under the development process as it provides key considera- Airport Cooperative Research Program (ACRP) to develop tions for the inventory makeup. this Guidebook for airports. The purpose of the Guidebook is to provide consistent guidance on developing airport GHG emissions inventories for those airports that wish to pre- Chapter 2 represents the heart of this Guidebook since it pare such inventories. The Guidebook includes methodical ties together the background information in Chapter 1 and instructions and diagrams to clearly specify the procedures