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MOBILE5a, although emissions are trip based and not VMT based. See the MOBILE5a
discussion for more information.
FAA Aircraft Engine Emission Database (FAEED) - FAEED (Reference 60) is a computerized
emission inventory calculation procedure developed by the FAA with support from EPA. For
analysis limited to aircraft, FAEED can be used to compute aircraft engine exhaust emissions for
any time period, activity level, or common aircraft type.
To calculate exhaust emissions using FAEED, the main data inputs needed are aircraft model,
engine model, and number of LTOs. Air carrier, airport, or air base information also may be
needed in some cases. If site-specific engine and time in mode information is not available, the
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model provides default data from EPA’s Procedure for Emission Inventory Preparation, Volume
IV, Chapter 5. The model lists possible engine models for each aircraft type and the associated
national market share, which can be used to choose a surrogate engine if site-specific data is not
available. The output of the emissions computation portion of the model is a calculated emissions
summary listing pollutant emissions, LTOs, and times in mode by each aircraft and engine
combination in the given inventory.
MOBILE5a - The EPA specifies that the most current version of the MOBILE motor vehicle
emissions model should be used to develop highway vehicle emission indices and emission
inventories. At the time of this writing (1996) the most current version of the motor vehicle
emissions model is MOBILE5a (Reference 76). The analysis considers traffic volumes and
movements within the terminal area and surrounding airport area. The model is designed to
account for the effect of numerous vehicle parameters on the volume of exhaust and evaporative
pollutants emitted. EPA’s Procedures for Emission Inventory Preparation, Volume IV, Chapter
3 contains recommendations and suggestions with regard to determining appropriate MOBILE
inputs, although it is not a substitute for the model’s user’s guide (Reference 88).
Inputs to the model include basic emission rate, fleet characteristics, fuels characteristics, and
control programs data. Default values for most input data are built into the EPA’s motor vehicle
emissions model, but are not likely to be directly applicable to a restricted airport or air base
analysis. The output of the model lists inputs and options chosen, emission indices for each of
EPA’s eight vehicle types, and emission indices for all eight vehicle types combined. Emission
indices are calculated for HC, CO, and NOx. If vehicle emission indices calculated using
MOBILE are to be part of an airport or air base inventory being developed using the EDMS, the
EDMS model will provide the user with the option to enter the emission indices developed using
the MOBILE model.
PART5 - The EPA’s PART5 model (Reference 80) should be used in the analysis of the
particulate air pollution impact of in-use gasoline-fueled and diesel-fueled motor vehicles. The
model calculates particle emission indices (including PM-10, SO2, and lead) in grams per mile
from on-road automobiles, trucks, and motorcycles. The emission indices calculated include
exhaust particulate, exhaust particulate components, brakewear, tirewear, and reentrained road
dust, which are required for PM-10 inventories and analyses. The required inputs and optional
inputs are described in detail in the PART5 user’s guide (Reference 72). PART5 contains default
values that can be used for most data required for the calculation of the emission indices,
although they are not likely to be directly applicable to a restricted airport or air base analysis. If
vehicle emission indices calculated using PART5 are to be part of an airport or air base inventory
being developed using the EDMS, the EDMS model will provide the user with the option to enter
the emission indices developed using the PART5 model.
TANKS - TANKS is an EPA computer model developed using the methodology and tank
information presented in Section 7.1, Volume I of Compilation of Air Pollutant Emission
Factors. When provided with data inputs, the program estimates annual emissions of evaporative
hydrocarbons from a single storage tank. Output from the program can be given as a total figure
for annual emissions, or a detailed breakdown of emissions by month, fuel component, and cause
of emissions (standing storage or working emissions). For many required variables, such as fuel
vapor pressure and climatic data, TANKS provides default values based on the fuel type or
location specified. If more detailed information is available to the user, TANKS allows the input
of that information so that default values are not used. It is strongly recommended that TANKS be
　
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