• Section 1: Introduction and Background – Provides basic and introductory information that helps the user to understand why this Handbook was created, its intended audience, and the overall objectives. 

• Section 2: Regulatory Framework – Identifies and summarizes pertinent regulations (e.g., acts, laws, policies, standards, etc.) that stipulate or drive the need for an air quality assessment. 

• Section 3: Sources and Types of Air Emissions – Describes the most common sources of air emissions associated with aviation , including the types of emissions that typically characterize each source. 

• Section 4: Air Quality Assessment Process – Discusses and delineates the overall approach to assessing air quality impacts associated with aviation-related projects, actions, and activities. Flowcharts and matrices are provided to help guide the process of selecting which assessment method(s) is most appropriate. 

• Section 5: Air Quality Assessment Models – Describes the various assessment models that are available and recommended to conduct a viation-related air quality assessments. Typical data requirements and documentation of the results are also discussed. 

• Section 6: Preparing an Emissions Inventory – Describes the recommended methods for preparing aviation-related emission inventories for the EPA “criteria” pollutants, hazardous air pollutants (HAPs), and greenhouse gases (GHGs) and for reporting the results of these analyses. 

• Section 7: Conducting Dispersion Modeling – Describes the recommended methods for conducting atmospheric dispersion modeling around airports and airport roadways and for reporting the results of these analyses. 

• Section 8: Conformity – Discusses the Conformity regulations of the federal CAA and how it applies to airport projects and actions. 

• Section 9: Coordination Best Practices – Discusses the objectives, benefits, and methods of conducting agency coordination in support of a viation-related air quality assessment processes. 

To aid in the comprehension and use of this material, a Glossary , lists of References , and Acronyms and Abbreviations are provided at the end of the Handbook . A set of Appendices are also provided that present detailed "how to" instructions, examples and further explanation. 

