Sec. 3: Sources & Types of Emissions  Criteria Pollutants  (and their precursors)   Hazardous Air  Pollutants (HAPs)   Greenhouse Gases  (GHGs)   Aircraft   Auxiliary Power Units  (APUs)   Ground Support Equipment  (GSE)   Ground Access Vehicles   Stationary & Area Sources   Construction  [Hdbk. Pgs. 10 - 17]  FAA Air Quality Handbook Tutorial  Federal Aviation  Administration  10 Types  Sources 