5.  Air Quality Assessment Models Aviation Emissions and Air Quality Handbook  Table 5-1. Emissions Inventory and Dispersion Models  This section identifies and offers guidance on the various models and other supporting resources  that are available to  Handbook  users for conducting aviation-related air quality analyses. These  tools comprise computer models and databases that enable the users to compute inventories and conduct dispersion modeling for aviation sources of air emissions based appropriate input data and information.  Table 5-1  ( Emissions Inventory and Dispersion Models ) identifies the air quality models  available to  Handbook  users for conducting airport air quality analyses associated with aviation- related projects and actions.  These analyses include  emissions inventories for both airport  operation and construction as well as airport and roadway dispersion modeling . The air quality  assessment models are further detailed within this section.  The Aviation Environmental Design Tool (AEDT) is developed and distributed by the FAA  Office of Environment and Energy  (AEE). 15  Essential and up-to-date information regarding  AEDT as well as links to AEDT  documentation and FAA guidance can be obtained on the  official website for AEDT. 16  AEDT is a  new software system that dynamically models aircraft performance to compute  emissions, fuel burn, and noise and assess their interdependencies.  AEDT has the capability to  conduct “full-flight” or “gate-to-gate” analyses of a single airport or a  “metroplex”, and further  assess these facilities  and operations on broader regional, nation- wide, and global levels.  15  FAA,  Aviation Environmental Design Tool  (AEDT),  http://www.faa.gov/about/office_org/headquarters_offices/apl/research/models/aedt/.  16  FAA,  AEDT Support Website , https://aedt.faa.gov/.  30$_{ }$ 5.1. Aviation Environmental Design Tool  Models  Emissions Inventories  Dispersion Modeling  Criteria Pollutants  GHG 1  HAPs  Airport  Roadway  (Hot-Spot  Analysis)  Airport  Operation  Airport  Construction  EDMS/AEDT      MOVES       NONROAD   AERMOD    CAL3QHC   Source: EPA,  Air Quality Models , http://www.epa.gov/ttn/scram/aqmindex.htm; FAA’s,  Emissions and  Dispersion Modeling System (EDMS) ,  http://www.faa.gov/about/office_org/headquarters_offices/apl/research/models/edms_model/, and Aviation  Environmental Design Tool (AEDT),  http://www.faa.gov/about/office_org/headquarters_offices/apl/research/models/aedt/; and EPA’s,  MOVES  (Motor Vehicle Emission Simulator) , http://www.epa.gov/otaq/models/moves/index.htm#generalinfo,  NONROAD Model , http://www.epa.gov/otaq/nonrdmdl.htm#docs,  AERMOD Modeling System ,  http://www.epa.gov/ttn/scram/dispersion_prefrec.htm#aermod, and  CAL3QHC/CAL3QHCR Models ,  http://www.epa.gov/ttn/scram/dispersion_prefrec.htm#cal3qhc, 2013.  $^{1 }$EDMS/AEDT estimate emissions of CO$_{2 }$and MOVES estimates emissions of CO$_{2}$, N$_{2}$O, and CH$_{4}$. 