Aviation Emissions and Air Quality Handbook  iv  5.  Air Quality Assessment Models........................................................................................ 30 5.1.  Aviation Environmental Design Tool ....................................................................... 30 5.1.1.  AEDT Development and Architecture..........................................................31 5.1.2.  AEDT Usage for Air Quality Assessments ..................................................31 5.2.  Emissions and Dispersion Modeling System ............................................................ 32 5.3.  MOVES..................................................................................................................... 32 5.4.  NONROAD............................................................................................................... 33 5.5.  AERMOD.................................................................................................................. 34 5.6.  CAL3QHC ................................................................................................................ 34 6.  Preparing an Emissions Inventory................................................................................... 36 6.1.  Criteria Pollutants...................................................................................................... 36 6.1.1.  Introduction & Background ..........................................................................36 6.1.2.  Existing Guidance.........................................................................................36 6.1.3.  Airport Operations ........................................................................................38 6.1.3.1.  Airport Operation Emission Inventory Methods .......................... 38 6.1.3.2.  Airport Operation Emission Inventory Results............................. 42 6.1.4.  Airport Construction Emissions....................................................................42 6.1.4.1.  Construction Emission Inventory Methods .................................. 42 6.1.4.2.  Construction Emission Inventory Results..................................... 43 6.2.  Hazardous Air Pollutants .......................................................................................... 44 6.2.1.  Introduction & Background ..........................................................................44 6.2.2.  FAA Guidance ..............................................................................................45 6.2.3.  HAPs Emission Inventory Methods..............................................................47 6.2.4.  HAPs Emission Inventory Results................................................................48 6.3.  Greenhouse Gases ..................................................................................................... 49 6.3.1.  Introduction & Background ..........................................................................49 6.3.2.  FAA NEPA Guidance...................................................................................50 6.3.3.  Methodology .................................................................................................52 6.3.4.  GHG Emission Inventory Methods ..............................................................53 6.3.5.  GHG Emission Inventory Results.................................................................55 7.  Conducting Dispersion Modeling for Criteria Air Pollutants ....................................... 57 7.1.  Atmospheric Dispersion Modeling for Airports ....................................................... 57 7.1.1.  Introduction & Background ..........................................................................57 7.1.2.  EPA Guidance...............................................................................................57 7.1.3.  Dispersion Modeling Methods......................................................................59 7.1.4.  Dispersion Modeling Results........................................................................61 7.2.  Roadway Dispersion Modeling................................................................................. 62 7.2.1.  Introduction & Background ..........................................................................62 7.2.2.  CAA and NEPA Guidance............................................................................62 7.2.3.  Roadway Dispersion Modeling Methods......................................................64 7.2.4.  Roadway Dispersion Modeling Results........................................................67