Planning for Offsite Airport Terminals (2010) / Chapter Skim
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Appendix - Transit Air Benefits Calculator: Description and User's Manual
Appendix - Transit Air Benefits Calculator: Description and User's Manual
Pages 76-86
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From page 76... ...
Following is a description of the criteria pollutants and other significant pollutants. Oxides of Nitrogen NOx cause respiratory problems and contribute to ozone formation, acid rain formation, nutrient overloading of lakes and streams, regional atmospheric haze, and global warming.
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Commonly known greenhouse gases are water vapor, carbon dioxide, tropospheric ozone, nitrous oxide, and methane. Motor vehicles directly emit or contribute to the creation of each of these greenhouse gases.
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From page 78... ...
EPA. Transit Air Benefits Calculator The Transit Air Benefits Calculator, a spreadsheet program, was developed by the project team to estimate the change in various air pollutants and overall air pollution resulting from the airport transportation link serving an offsite airport terminal.
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From page 79... ...
Transit Air Benefits Calculator: main calculations page. Source: Resource Systems Group, Transit Air Benefits Calculator.
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The VMT savings should be calculated using the methodology described in Chapter 6 of this report, taking into account all low-occupancy-vehicle modes including taxi, limousine, private automobile pick-up/drop-off, and private automobile long-term parking. However, if the data is not available for calculating VMT savings at this level of detail, the Transit Air Benefits Calculator includes a simplified VMT calculator method that simply considers the number of buses per day, average number of passengers per bus, the automobile occupancy of the displaced passenger cars, the number of round trips per bus, and the round trip miles per bus (Figure A-3)
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Source: Resource Systems Group, Transit Air Benefits Calculator Figure A-4. Instructions and list of fuel types.
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. A simplified method for calculating the VMT is available Emission Control Technology NOx PM HC CO CO2 Diesel Oxidation Catalyst 20% 50% 30% Diesel Oxidation Catalyst + Closed Crankcase Ventilation 25% 40% 30% Diesel Particulate Filter 85% 90% 90% Diesel Particulate Filter + Closed Crankcase Ventilation 95% 90% 90% Diesel Particulate Filter + Lean NOx Catalyst 25% 90% 75% 75% Diesel Particulate Filter + Hybrid Electric 50% 95% 90% Diesel Particulate Filter + Exhaust Gas Recirculation 40% 90% 90% 90% Partial Flow Filter 50% 75% 75% Recalibration 25% Selective Catalytic Reduction 70% 40% 70% 90% Source: U.S.
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From page 83... ...
The calculator, shown in Figure A-10, calculates idle time as follows: The idle-time calculator estimates annual idling hours based on the buses per day, round trips per bus, number of stops, idle time per stop, and idling at the garage. Daily Idle Time in Hours (Number of Buses p = er Day)
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A negative value indicates a reduction in regional emissions and, thus, a net improvement in air quality for that pollutant. Source: Resource Systems Group, Transit Air Benefits Calculator Figure A-7.
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4 3 .1 7 273. 4 tons minus Passenger Vehicle Emissions Offset 57.4 1.4 65.2 928.5 21399.2 tons Net Change in Emissions -13.3 -1 -64.8 -925.4 -14125.8 tons Net change in greenhouse gas emissions equivalent to CO2 emitted by -1,443,587 gallons of gasoline per year Note: A negative change indicates a net reduction in air emissions.
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From page 86... ...
725 0. 11 0 Note: A negative change indicates a net reduction in air emissions.
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