Aviation Emissions and Air Quality Handbook  For airport applications, the typical AERMOD input requirements and their corresponding  data  parameters are listed in  Table 7-1  ( AERMOD Model Inputs and Data Requirements ).  Model Inputs  Data Parameters  Model Options  • Averaging time  • Pollutants  Urban versus rural  Emission Source Release  Parameters  • Location coordinates  • Area dimensions  Roadway link length and width  • Stack height  • Stack diameter  • Exit temperature  • Exit velocity  Meteorological Data  • Surface/upper air conditions  • Wind speed and direction  • Ambient temperature  Mixing height  • Surface roughness, albedo, Bowen ratio  Spatial Allocation  • Runway coordinates  • Runway utilization  • Taxiways and taxipaths  • Gate assignments  • Airport capacity and configuration  Temporal Profiles  • Quarter hour  • Daily  • Monthly  Topography Data  • Source and receptor elevations  Building Downwash  • Building height and dimensions  • Stationary source locations  Receptor Locations  • Location coordinates  • Flagpole height  NO to NO$_{2 }$Conversion  • In-stack emission ratio  • Ozone concentrations  • Initial ozone concentration  Background Concentrations  • Nearby ambient monitoring data  Source: EPA Preferred/Recommended Models,  AERMOD Modeling System ,  http://www.epa.gov/ttn/scram/dispersion_prefrec.htm#aermod.  Table 7-1. AERMOD Model Inputs and Data Requirements  When dispersion modeling is conducted at airports for the EPA criteria pollutants, CO, NO $_{2}$,  PM$_{10}$, and PM 2.5  are most commonly evaluated. Characteristically, CO levels are typically  elevated in areas of high motor vehicle traffic such as the main terminal area access/egress  roadways, curbsides and parking facilities. By comparison, NO $_{2 }$concentrations are also more  likely to be highest near the runway ends where aircraft engine thrust settings are at their highest.  60$_{ }$