Module 1: What is an Emissions Inventory?
Upon completion of this module, learners will be able to explain the basic aspects of an air emissions inventory, including:
•Defining an air emissions inventory
•Identifying the elements that constitute an emissions inventory
•Describing the types of pollutants found in inventories
•Describing how pollutants are represented in inventories
•Describing the sources found in inventories
•Explaining the geographic components of an emissions inventory
•Explaining the temporal components of an emissions inventory
•Explaining the emissions components of an emissions inventory

Module 2: Purposes and Types of Emissions Inventories
After completion of this module, learners will be able to explain the purposes and types of air emissions inventories, including:
•Explaining the purpose of emissions inventories
•Describing how different types of emissions inventories can meet different needs
•Describing the three national emissions inventories that the EPA develops
•Explaining how the three national emissions inventories differ
•Explaining the key uses of emissions inventories

Module 3: Developing Air Emissions Inventories
After completion of this module, learners will be able to describe the approaches, methods and tools/data used for building emissions inventories, including:
•Explaining how existing inventories and other resources contribute to emissions inventory development
•Identifying the key considerations in developing a workplan for emissions inventory building
•Defining activity data
•Identifying examples of activity data
•Describing general approaches for data collection for emissions inventory development
•Describing data collection processes used for point sources
•Describing data collection processes used for nonpoint sources
•Identifying examples of data collected for other types of sources (mobile, fires and biogenic)
•Identifying the methods used for estimating emissions
•Describing the considerations for choosing a method for estimating emissions
•Explaining why documentation is important when developing an emissions inventory
•Explaining the types of information included in documenting an emissions inventory
•Explaining how quality assurance relates to emissions inventories
•Describing some basic aspects of a quality assurance program

Module 4: The National Emissions Inventories
After completion of this module, learners will be able to explain the key aspects of the National Emissions Inventory (NEI), including:
•Defining the National Emissions Inventory
•Explaining the general concepts of the National Emissions Inventory
•Explaining the purposes and key goals of the NEI
•Explaining the uses of the NEI
•Defining the key inventory elements provided by the NEI
•Describing each of the key inventory elements as they pertain to the NEI
•Identifying the three primary methods used to categorize emissions sources in the NEI
•Describing how each of the three methods organize emissions source data within the NEI
•Describing generally how the NEI is created
•Explaining the process and timeline for NEI development