Aviation Emissions and Air Quality Handbook  • 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.  3$_{ }$