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## 5. Air Quality Assessment 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. 

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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$_{4}$. 

## 5.1. Aviation Environmental Design Tool 

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. 

