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Pollutant emissions from emergency generators are calculated using a methodology based on the
generator capacity, generator usage rate, and pollutant emission indices. Emissions are calculated
by multiplying the power capacity of each generator by the number of hours the generator was
operated and by the emission index for each specific pollutant.
Total pollutant emissions from an emergency generator may be estimated by applying Equation
H-3.
H-11
Eti S [GC x T x UIi x (1 - CF/100)]
Where:
Eti - total emissions of pollutant i, in pounds, from the emergency generator for
inventory time period
GC - generator power capacity rating (horsepower)
T - time (in hours) generator was operated during inventory time period
UIi - uncontrolled emission index for pollutant i (pounds pollutant per horsepowerhour
of power output)
CF - air pollution control factor (%)
i - pollutant (CO, NOx, SO2, PM-10, HC)
Equation H-3: Pollutant Emissions for Emergency Generators (AP-42 Method)
H2.2.2 Data Sources (EPA AP-42)
The particular data inputs required for the emissions calculation methodology for each
emergency generator are listed in the following paragraphs (2.2.2.1. through 2.2.2.4).
H2.2.2.1 Capacity of Generator Engine
Available from the manufacturer, airport operator, or base operations department. This should be
expressed in terms of horsepower (or kilowatts, if metric emission indices from AP-42 are used).
H2.2.2.2 Time of Generator Use
Available from airport operator or base operations department. This should be expressed in hours
of generator operation.
H2.2.2.3 Emission Indices
Uncontrolled emission indices for gasoline and diesel industrial engines are given in Section 3.3
of EPA’s Compilation of Air Pollutant Emission Factors. The type of fuel burned should be
available from the fuel supplier, airport operator, or base operations department.
H2.2.2.4 Air Pollution Control Factor
Information on any air pollution control equipment and control efficiency should be obtained
from the airport operator or base operations department. This figure should be expressed as a
percent reduction from the uncontrolled emission level. Air pollution control methods for
emergency generators include steam injection, water injection, and selective catalytic reduction
for NOx control.
H2.2.3 Methodology (U.S. Air Force)
Pollutant emissions from emergency generators are calculated using a methodology based on the
quantity of fuel burned and pollutant emission indices. Emissions are calculated by multiplying
the quantity of fuel burned by the emission index for each specific pollutant.
Total pollutant emissions from an emergency generator may be estimated by applying Equation
H-4:
H-12
Eti = S [F x UIi x (1 - CF/100)]
Where:
Eti - total emissions of pollutant i, in pounds, from the emergency generator
for given time period
F - total quantity of fuel burned, in thousands of gallons (or million cubic
feet for natural gas), for given time period
UIi - uncontrolled emission index for pollutant i (pounds pollutant per
thousand gallons of fuel or mcf gas burned)
CF - air pollution control factor (%)
i - pollutant (CO, NOx, SO2, PM-10, HC)
Equation H-4: Pollutant Emissions for Emergency Generators (USAF Method)
H2.2.4 Data Sources (U.S. Air Force)
The particular data inputs required for the emissions calculation methodology for each
emergency generator are specified in the following paragraphs (2.2.4.1 through 2.2.4.3).
H2.2.4.1 Quantity of Fuel Burned
Available from the fuel supplier, airport operator, or base operations department. This should be
expressed in terms of thousands of gallons of fuel burned, or in the case of natural gas, million
cubic feet.
H2.2.4.2 Emission Indices
Uncontrolled emission indices for emergency generators powered by reciprocating engines are
given in
Table H-2. Note that for two of the emission indices, the percent of sulfur in the fuel must be
obtained to calculate the emission indices. The type of fuel and sulfur content should be available
from the fuel supplier, airport operator, or base operations department.
H2.2.4.3 Air Pollution Control Factor
Information on any air pollution control equipment and control efficiency should be obtained
from the airport operator or base operations department. This figure should be expressed as a
percent reduction from the uncontrolled emission level. Again air pollution control methods for
emergency generators include steam injection, water injection, and selective catalytic reduction
for NOx control.
H-13
Fuel
Emission Indices (lb/103 gallons fuel or mcf gas)
CO PM PM-10 NOx SO2
　
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