Diesel Emissions Quantifier
 

User’s Guide 
Diesel Emissions Quantifier
 

User’s Guide
 

Transportation and Regional Programs Division 

Office of Transportation and Air Quality 

U.S. Environmental Protection Agency 

NOTICE 

This technical report does not necessarily represent final EPA decisions or 

positions. It is intended to present technical analysis of issues using data 

that are currently available. The purpose in the release of such reports is to 

facilitate the exchange of technical information and to inform the public of 

technical developments. 

EPA-420-B-10-033 

August 2010 
Diesel Emissions Quantifier User's Guide 

Table of Contents 

Page 

1. Introduction.............................................................................................................................. 1
 

2. Screen-Specific Instructions.................................................................................................... 2
 

2.1 Overview Tab ....................................................................................................................... 2
 

2.2 My Account Tab ................................................................................................................... 2
 

2.3 Use the Quantifier Tab.......................................................................................................... 2
 

2.3.1 Fleet Entry Section........................................................................................................ 2
 

2.3.2 Enter New Vehicle Group Information Section............................................................ 4
 

2.3.2.1 Enter New Marine Vessel ...................................................................................... 6
 

2.3.3 Apply a Technology to New Vehicle Group ................................................................ 7
 

2.3.3.1 Apply a Technology to a Marine Vessel................................................................ 9
 

2.3.4 Save a New Vehicle Group and Technology.............................................................. 10
 

2.3.5 Edit Data ..................................................................................................................... 10
 

2.3.5.1 Edit Vehicle Group Information .......................................................................... 10
 

2.3.5.2 Edit Technology Information............................................................................... 10
 

2.3.6 Calculate Results......................................................................................................... 10
 

2.3.6.1 Emissions Results Screen: Summary Results Tab.............................................. 10
 

3. Quick Start Tab...................................................................................................................... 14
 

4. References Tab....................................................................................................................... 14
 

Appendix A: Drop-down List Options................................................................................... A-1
 

Appendix B: Quantifier Calculations..................................................................................... B-1
 

1. Overview............................................................................................................................. B-1
 

2. Symbols .............................................................................................................................. B-1
 

3. Inputs .................................................................................................................................. B-1
 

4. Conversion Factors and Constants...................................................................................... B-2
 

5. Results Calculations............................................................................................................ B-3
 

5.1 Daily/Annual Emissions Results Calculations............................................................. B-3
 

5.2 Lifetime Emissions Results Calculations..................................................................... B-7
 

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Diesel Emission Quantifier User's Guide 

Table of Contents (cont.) 

Page 

6. Special Cases ...................................................................................................................... B-9
 

6.1 Vehicle and Engine Replacement/Repower Strategies................................................ B-9
 

6.2 Trailer Strategies........................................................................................................ B-10
 

6.3 Aerodynamic Devices................................................................................................ B-10
 

7. Benefits Module................................................................................................................ B-10
 

Appendix C: Scrappage Rate Tables ..................................................................................... C-1
 

Appendix D: Locomotive Default Usage................................................................................ D-1
 

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Diesel Emissions Quantifier User's Guide 

List of Tables 

Page 

Table 1: Annual, Daily, and Lifetime Emission Results.................................................... 11
 

Table A-1: Vehicle Types and AssociatedTarget Fleets ...................................................... A-1
 

Table A-2: Target Fleets and Associated Class Equipment ................................................ A-1
 

Table A-3: Horsepower Options ............................................................................................ A-6
 

Table A-4: Displacement Options.......................................................................................... A-8
 

Table A-5: Fuel Types............................................................................................................. A-9
 

Table A-6: Retrofit Technology Types and Associated Technologies .............................. A-10
 

Table C-1: On Highway Scrappage Table: Scrappage Table Survival Fraction 

(Based on 1980 Vehicles) ..................................................................................... C-1
 

Table C-2: NonRoad Median Life Table............................................................................... C-3
 

Table C-3: NonRoad Default Scrappage Curve................................................................... C-5
 

Table D-1: Annual Activity Hours (Default Usage) for Line-Haul, Passenger, and 

Switch Locomotive............................................................................................... D-1
 

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Diesel Emissions Quantifier User's Guide 

Diesel Emissions Quantifier 

User's Guide 

1. Introduction 

The Diesel Emissions Quantifier ("the Quantifier") is a tool that enables users to estimate 

emissions from a fleet of diesel vehicles and/or equipment. The Quantifier can calculate 

emissions estimates of NOx, PM, HC, CO, and CO2 for highway and NonRoad vehicles, and 

marine vessels that utilize various emissions control technologies. 

The Quantifier has been modeled after the National Mobile Inventory Model (NMIM) 

and the 2008 Locomotive Engines and Marine Diesel Engines Emission Standards Regulations. 

The NMIM is an application developed by the EPA to determine estimates of current and future 

emission inventories for on-road motor vehicles and NonRoad equipment. The Quantifier is a 

web-based interface that asks users intuitive questions to help estimate their emissions. 

The Quantifier is capable of the following: 

1. Calculating emissions from a single emissions reduction project; 

2. Comparing fleet emissions using different retrofit control technologies; and 

3. Assisting SmartWay carrier partners and grantees in developing proper data reports for 

submission to the EPA. 

The Quantifier calculates the following quantities for the fleet's baseline emissions for 

one year, and for the lifetime of a fleet: emissions reduced by the use of control technologies, 

and the cost effectiveness of control technologies. The calculated results may then be 

downloaded. 

The following SIP and conformity language appears as part of the Disclaimer on the 

Overview tab for the Quantifier: 

"The Diesel Emissions Quantifier is intended as a helpful tool to prepare estimates, but is 

not designed to meet requirements under other types of air or transportation submissions. 

Please do not continue using the Quantifier until you have read the important usage 

information below. 

●	 The Diesel Emission Quantifier should not be used for the calculation of any 

emission reductions to be incorporated in a State Implementation Plan (SIP) or 

conformity determination. 

●	 If you wish to calculate emission reductions for a SIP or conformity determination, 

you should review the appropriate SIP and conformity guidance document and 

consult with your EPA Regional Office. 

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●	 For long-duration idle reduction, the SIP and conformity guidance can be found in the 

document Guidance for Quantifying and Using Long Duration Truck Idling Emission 

Reductions in State Implementation Plans and Transportation Conformity (January, 

2004, EPA420-B-04-001, PDF, 33 pages, 379K, About PDF). 

●	 For retrofit projects, the SIP and conformity guidance can be found in the document 

Diesel Retrofits: Quantifying and Using Their Benefits in SIPs and Conformity 

(June, 2006, EPA420-B-06-005, PDF, 69 pages, 530K, About PDF). 

●	 For emission reduction strategies not covered by those guidance documents, please 

consult with your EPA Regional Office." 

2. Screen-Specific Instructions 

2.1 Overview Tab 

The Overview Tab provides users with a basic description of the ways in which the 

Quantifier can be used, and ways in which the Quantifier should not be used. 

2.2 My Account Tab 

On the My Account Tab (which is also accessible via the Use the Quantifier Tab) users 

have the option to log in by entering their email address and password. Logging in enables the 

user to store information on up to five fleets so that it can be retrieved at a later time. 

To obtain a login and password, the user must click on the "Register New Account" link. 

This link takes the user to the registration screen, where contact information is entered. Required 

contact information includes the user's email address, chosen password, contact name, 

organization name, and phone number. The user can opt to enter additional contact information 

including their position and address. When the registration information is saved, the user is 

taken back to the Use the Quantifier Tab. 

The "Forgot Password?" option takes the user to the My Account tab where they are 

prompted to enter their email address. An email will be sent to the user which contains an 

Internet link where the user can change their password. To log out at any time, the user can click 

on the "Log out" link at the top of each screen under the Use the Quantifier Tab. 

2.3 Use the Quantifier Tab 

2.3.1 Fleet Entry Section 

On the Use the Quantifier Tab, either logged in as an authenticated user or not logged in 

as an unauthenticated user, users are then prompted to begin use of the Quantifier by defining 

basic Fleet Entry information. This includes information for the following fields: 

Fleet Name: This is a user Defined Name for the Fleet. 

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Diesel Emissions Quantifier User's Guide 

Fleet Type: On Highway/NonRoad OR Marine. (Please note that the marine vessel component 

is separate from the On Highway and NonRoad component of the Quantifier.) 

State: The user will select a state from the drop-down list. The user should select the state 

where the project is located. If the project spans across more than one state, select the state that 

will yield the majority of the emissions reduction benefits. The user does not need to select a 

state if they are returning to a saved scenario. 

"Are you Quantifying Emissions for EPA?" Indicator: When the user selects this "preparing 

data" option, a contact information section will appear below the state drop-down list. All fields 

in the Required Contact Information section must be completed by all users who select the 

"preparing data" option. Users who want to download data to use in an EPA grant application 

only need to complete the Required Contact Information fields. In addition to the Required 

Contact Information section, existing SmartWay partners are required to complete the SmartWay 

Carrier Questionnaire which appears below the Optional Contact Information section when the 

"Click here if you are a SmartWay Carrier/Partner" hyperlink is clicked on. Users who are 

joining the SmartWay partnership for the first time are requested to complete the fields in the 

Required and Optional Contact Information sections, and the SmartWay Carrier questionnaire. 

The questionnaire contains the following information: 

●	 Does the data represents the user's initial fleet baseline, action plan, or annual update? 

● Average payload. 

●	 The number of straight trucks, tractors, and trailers that are owned, leased, and 

subcontracted. 

●	 The percentage of the fleet operating in each of the following modes: 

-- Truckload; 

-- Less than Truckload; 

-- Pickup/Delivery; 

-- Leasing; and 

-- Other. 

●	 The user's parent company and subsidiaries (if applicable). 

The questionnaire can be hidden by clicking on the "Click here if you are not a 

SmartWay Carrier/Partner" hyperlink which appears at the top of the questionnaire. Once 

finished, the user can click Continue to move to the next screen to input specific information on 

the fleet. 

"Are you entering project funding information to calculate total cost effectiveness?" 

Indicator: Entering funding data is optional, but if the user wants to view the Total Cost 

Effectiveness of a project, funding data are required. The user can select Yes for this indicator 

and a list of funding sources and fields for dollar amounts will appear. The user should enter 

funding amounts in the appropriate fields. Funding data includes all costs associated with a 

project, including retrofit capital costs, installation costs, administrative costs, etc. 

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Diesel Emissions Quantifier User's Guide 

Total Project Funding: This quantity is the sum of all funding source amounts entered by the 

user. The Quantifier automatically calculates this value. In order for the Quantifier to accurately 

calculate Total Cost Effectiveness, the user must ensure that the Total Project Funding amount 

only applies to the current vehicle group(s) entered. For example, if a user wishes to apply 

$100,000 of funding to two vehicle groups, entering $100,000 of funding for each vehicle group 

will result in a funding amount of $200,000 being used in the Total Cost Effectiveness 

calculation. Instead, the user should input all the funding information with the first vehicle 

group. If there are multiple vehicle groups then funding information for subsequent vehicle 

groups should be left at zero. 

To Save Fleet Entry information, select Save Fleet, and the Enter Vehicle Group Section 

will be made available. 

2.3.2 Enter New Vehicle Group Information Section 

On this screen, the user will input information specific to each vehicle group in the fleet, 

as well as the vehicles to which one or more emission reduction strategies are applied. For fields 

specific to marine vessels, refer to Section 2.2.2.1. All other field definitions for marine vessels 

can be found in Section 2.2.2. This includes the types of vehicles in the fleet, the number, model 

year, and retrofit year of each vehicle group; fuel and usage information; the type(s) of 

technology applied; and cost information. This screen must be completed for each vehicle group 

separately. The user is encouraged to input fleet data with as much detail as possible; there is no 

limit to the number of vehicle groups that can be entered for a fleet. For example, a user has a 

fleet of 100 school buses with a range of model years from 1990 to 2005. The user may enter 

this fleet as one entry using an average model year. Alternatively, the user may enter vehicles of 

each model year separately. The more accurate the data entered is, the more accurate the results 

will be. 

The Enter New Vehicle Group Information section of the Fleet Information screen is 

where the user enters information on each vehicle group in the fleet. After the required Fleet 

Information has been entered and saved, the user can begin entry for a Vehicle Group within the 

Fleet. The following fields appear in the order listed below, and must be completed or selected 

from drop-down lists. All of the drop-down list options are provided in Appendix A. Numeric 

values must be entered without commas. 

State: The state selected on the Start Screen will appear as the Selected State. 

Type: Select the vehicle type (either On Highway or NonRoad) for the vehicle group from the 

drop-down list. 

Target Fleet: Select the vehicle group target fleet from the drop-down list. The list options will 

vary depending on the Type selected. 

Class/Equipment: Select the Vehicle/Equipment category from the drop-down list. The list 

options vary depending on the Target Fleet selected. 

Quantity: Enter the number of the vehicles of the fleet in a specific vehicle group. 

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Diesel Emissions Quantifier User's Guide 

Model Year: Enter the model year of the engine, not the vehicle. 

Retrofit Year: Enter the year the emissions control retrofit will be installed. 

Horsepower: If the user selects NonRoad as the Type, a field for Horsepower will appear below 

the Retrofit Year field. The user must select the vehicle's horsepower from the drop-down list. 

If the Horsepower drop-down list does not include an exact match for the user's vehicle, the user 

should select the nearest value. 

In the following fields, the user must provide information on how the vehicles in a 

particular vehicle group are operated. This includes information on fuel usage, distance traveled, 

travel time, and idling time. There is a direct correlation between fuel usage and CO2 emissions. 

Different fuels emit different amounts of CO2 based on their chemical make-up. 

Fuel Type: Select the fuel used by the vehicle group from the drop-down list. Table A-4 lists 

the options that appear in the Fuel Type drop-down list, their associated CO2 factors, and the 

vehicle types and years for which each fuel type can be selected. The CO2 factors are multiplied 

by the fuel volume to convert a non-diesel fuel volume into a diesel equivalent. The resulting 

value will be displayed in the "Calculated Fuel Volume" field. 

Fuel Volume: Fuel Volume is the amount of fuel used (in gallons per year) by all vehicles in a 

group, including fuel consumed while idling. A Fuel Type must be selected before the user can 

enter Fuel Volume. Depending on which Fuel Type is selected, the user-entered Fuel Volume is 

converted into a diesel equivalent in the "Calculated Fuel Volume" field. This allows the CO2 

emissions to be compared on an equal basis across the entire fleet. 

Vehicle Miles Traveled (VMT): This field will only appear if "On Highway" is selected as the 

Type. If "NonRoad" is selected as the Type, a Usage Rate field will appear instead. VMT is the 

average number of miles traveled per vehicle in the group per year. VMT can be calculated by 

averaging the miles traveled per year of all vehicles in a group. Alternatively, VMT can be 

calculated by dividing the total miles traveled in a year by the total number of vehicles in the 

group. The example below illustrates this calculation: 

Example: 

Vehicle Miles/Year 

1 10,000 

2 20,000 

3 30,000 

VMT = (10,000 + 20,000 + 30,000 miles/year) / 3 vehicles = 20,000 miles/vehicle/year 

Usage Rate: This field will only appear if "NonRoad" is selected as the Type. The Usage Rate 

is the average number of hours of use per vehicle per year. It is calculated by averaging the 

number of hours of use per year of all vehicles in a group. Alternatively, Usage Rate can be 

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Diesel Emissions Quantifier User's Guide 

calculated by dividing the total hours of use by all vehicles in a group in one year by the number 

of vehicles in the group. An example of this calculation is provided below: 

Example: 

Vehicle Hours of Use/Year 

1 500 

2 1,000 

3 1,200 

Usage Rate = (500 + 1,000 + 1,200 hours/year) / 3 vehicles = 900 hours/vehicle/year 

The Quantifier will automatically populate this field for Locomotive Passenger, 

Locomotive, Switch, and Locomotive Line Haul vehicles. The user can change these default 

values. 

Idling Hours (including hours saved): The Idling Hours field only appears for On Highway 

vehicles. This is the average number of hours spent idling per vehicle per year including any 

hours diverted (saved) using an idling control strategy. The Quantifier calculates On Highway 

emissions based on two modes: drive and idle. In order to show proper savings, the user must 

input information based on the true number of hours diverted (saved) using the control strategy. 

Idling hours can be calculated by averaging the idling hours of each vehicle in a group, or by 

adding the idling hours of all vehicles in a group, and dividing this sum by the number of 

vehicles. This is to include hours that have been diverted through idling control measures. 

2.3.2.1 Enter New Marine Vessel 

Quantity: For marine vessels, only one vessel may be modeled at a time. This value is set to 

one. 

Number of Engines: Enter the number of engines on the vessel (up to five), both propulsion 

and auxiliary engines. 

Unique Engine Type 1: All fields under this and subsequent types are related to the specific 

engine. 

Type: Select propulsion or auxiliary. 

Quantity (Engines): Enter the number of engines unique to the characteristic defined in the 

following fields. 

Displacement per cylinder: Select the range of displacement per cylinder per engine. 

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2.3.3 Apply a Technology to New Vehicle Group 

In the Apply a Technology to New Vehicle Group section of the Fleet Information 

screen, the user enters information on the emission control technologies that are to be applied to 

the vehicle group. The user will have the option to add a new technology after saving the 

Vehicle Group. The following fields appear in the order listed below, and must be completed or 

selected from drop-down lists. All of the drop-down list options are provided in Appendix A. 

Technology Type: The Technology Type is an emissions control category. The Technology 

Type is selected from the drop-down list. 

Technology: Technology is a specific emissions control method that is selected from the dropdown list. When multiple technologies are applied to a single vehicle, the following rules and 

restrictions apply: 

●	 Engine Replacement/Repower -- only one technology may be applied to a vehicle. 

●	 Hybrids -- only one technology may be applied to a vehicle. 

●	 Emission Control Devices -- only one technology may be applied to a vehicle. 

●	 Engine and Truck Upgrades -- only one technology may be applied to a vehicle. 

●	 Trailer Strategies -- only one technology may be applied to a vehicle. 

● Aerodynamic Devices -- multiple selections may be applied to a vehicle. 

●	 Tire Technology -- only one technology may be applied to a vehicle. 

●	 Weight Reduction -- only one technology may be applied to a vehicle. 

●	 Fuel Options -- only one technology may be applied to a vehicle. 

●	 Advanced Lubricant Technology Strategies -- only one technology may be applied to a 

vehicle. 

●	 Speed Management Policies -- only one technology may be applied to a vehicle. 

●	 Idling Control Strategies -- multiple selections may be applied to a vehicle. Note that 

the idling hours reduced for all selections must not exceed the total idling hours which 

were inputted under the vehicle group section. 

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The following technology combinations are not allowed: 

If This Is Selected... Then This Is NOT an Option 

Diesel Particulate Filter or any of the following combinations 

with a filter: 

● Lean NOx Catalyst + Diesel Particulate Filter 

● Exhaust Gas Recirculation + Diesel Particulate 

Filter 

● Diesel Particulate Filter + ULSD 

● Hybrid Electric Replacement with Diesel 

Particulate Filter 

Any Fuel Option. 

Any of the following Diesel Oxidation Catalyst combinations 

with fuel: 

● Diesel Oxidation Catalyst + B10 

● Diesel Oxidation Catalyst + B20 

● Diesel Oxidation Catalyst + B100 

● Diesel Oxidation Catalyst + ULSD 

● Diesel Oxidation Catalyst + emulsion 

● Diesel Oxidation Catalyst + Closed Crankcase 

Ventilation + B10 

● Diesel Oxidation Catalyst + Closed Crankcase 

Ventilation + B20 

● Diesel Oxidation Catalyst + Closed Crankcase 

Ventilation + B100 

● Diesel Oxidation Catalyst + Closed Crankcase 

Ventilation + ULSD 

● Diesel Oxidation Catalyst + Closed Crankcase 

Ventilation + emulsion 

Any Fuel Option. 

New Model Year: This field will only appear if the Engine Replacement/Repower technology 

type is selected. This New Model Year is the model year of the new or retrofitted engine. 

Idling Hours Reduced: If Idling Control Strategies are selected as the Technology Type, the 

Idling Hours Reduced field appears. The user should enter the number of idling hours reduced 

by implementing the selected Technology. The number of idling hours reduced cannot exceed 

the number of idling hours entered for the vehicle group. 

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Apply Technology To: Enter the number of vehicles to which this technology applies. This 

number can be all or a portion of the Quantity entered previously for the entire vehicle group. 

As the user adds technologies, this section will expand to list out each group of vehicles to which 

technologies have been applied. For example, if Technology 1 is applied to 20 out of 100 

vehicles, the following two lines will appear: 

● Apply to ___ vehicles (out of 20) that currently have Technology 1; and 

● Apply to ___ vehicles (out of 80) that do not currently have a Technology. 

Pollutants Table: Once the Technology Type and Technology are selected, the percent 

emissions reductions for NOx, PM, HC, CO, and CO2 will automatically populate the Pollutants 

table. The percent reductions are average values specific to the selected technology. Note that 

for Idling Control Strategies, the percent reductions are based on the engine being used in idling 

mode only. If the user knows the exact percent reductions for the specific technology they have 

selected, then they can manually change the values that appear in the table. The maximum 

percentage a user can enter is 100%. It is recommended that users only make changes if they 

have more accurate values from the manufacturer. The following disclaimer appears below the 

"Installation Cost" field and applies to the pollutants table: 

"Note that the percent reduction associated with a particular retrofit technology or cleaner 

fuel may vary by manufacturer and application and may change as more information 

becomes available. Please refer to EPA's verified technology web page for the latest 

detailed information on verified emission reductions from retrofit technologies. Some of 

the technologies listed here are not yet verified by EPA or the California Air Resources 

Board (CARB). Emissions reductions calculated by this model based on user-entered 

percent reductions not based on EPA or CARB's verified technology list should not be 

used for any official purposes or to meet any reporting requirements. Emission 

reductions calculated by this model based on user-entered percent reductions not based 

on EPA or CARB's verified technology list should not be used for any official purposes 

or to meet any reporting requirements." 

EPA's verified technology web page is http://www.epa.gov/otaq/retrofit/verif-list.htm. 

Unit Cost: The cost to purchase an emission control technology for one vehicle. The user must 

enter a non-negative numeric value. The Quantifier uses this value to calculate Capital Cost 

Effectiveness. 

Installation Cost: The cost to install the selected emission control technology on one vehicle. 

The user must enter a non-negative numeric value. The Quantifier uses this value to calculate 

Capital Cost Effectiveness. 

2.3.3.1 Apply a Technology to a Marine Vessel 

Once a technology type and technology have been selected, the user must apply the 

technology to the Engine Type. The technology may be applied to one or more engine types. 

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2.3.4 Save a New Vehicle Group and Technology 

Once all the required vehicle group fields are complete, the user can save the information 

by clicking the "Save" button, or the "Add a New Vehicle Group" option to add additional 

vehicle groups. If the user would like to clear the data entered on the screen without saving it, 

the "Go Back to Start" hyperlink at the top of the screen must be clicked. From the Start Screen, 

the user can click "Continue" to return to the Fleet Information screen. 

To save control technology information, the user must click the "Save Technology" 

button. Once at least one vehicle group is saved, the user can edit the group, add technologies, 

add additional vehicle groups, or proceed to the Results page. 

2.3.5 Edit Data 

The user can edit or delete any group, and delete any technology by clicking the "Edit" or 

"Delete" buttons. 

2.3.5.1 Edit Vehicle Group Information 

Once a vehicle group is saved, if the Vehicle Group Information is not immediately 

editable the user can edit vehicle group information by clicking on the Edit Group button. All 

Vehicle Group Information fields are editable. 

To add an additional vehicle group, the user must click the "Add New Vehicle Group" 

header bar. 

2.3.5.2 Edit Technology Information 

To apply additional technologies to a vehicle group, the user must enter technology 

information and click the "Save Technology" Button. To edit a saved technology, the user must 

click the "Delete" button that corresponds to the technology and re-enter the data. 

2.3.6 Calculate Results 

Once the user has finished entering data for an entire fleet, the user can click the 

"Quantify Emissions" button at the bottom of the screen to calculate results. 

2.3.6.1 Emissions Results Screen: Summary Results Tab 

When the user clicks on the "Quantify Emissions" button on the Fleet Information screen, 

the user will be taken to the Results screen. The formulas used to generate the results are 

provided in Appendix B. 

The data that appear in the Results table are an aggregation of the emissions from all 

vehicle groups and technologies that the user entered. The Results table has the following 

format: 

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Diesel Emissions Quantifier User's Guide 

Table 1: 

Annual, Daily, and Lifetime Emission Results 

Annual 

NOx 

(tons/ 

year) 

PM 

(tons/ 

year) 

HC 

(tons/ 

year) 

CO 

(tons/ 

year) 

CO2 

(tons/ 

year) 

Diesel 

Equivalent 

(gallons/year) 

Baseline of Entire Fleet 

Baseline of Vehicles Retrofitted 

Percent Reduced (%) 

Amount Reduced Per Year 

Daily 

NOx 

(kg/ 

day) 

PM 

(kg/ 

day) 

HC 

(kg/ 

day) 

CO 

(kg/ 

day) 

CO2 

(kg/ 

day) Fuel (g/day) 

Kilograms Reduced Per Day -------------

Lifetime 

NOx 

(tons) 

PM 

(tons) 

HC 

(tons) 

CO 

(tons) 

CO2 

(tons) 

Diesel 

Equivalent 

(gallons/year) 

Baseline of Entire Fleet 

Baseline of Vehicles Retrofitted 

Percent Reduced (%) 

Amount Reduced 

Amount Emitted after Retrofit, Entire 

Fleet 

Amount Emitted after Retrofit, 

Retrofitted Vehicles 

Capital Cost Effectiveness ($/ton), 

Retrofitted Vehicles -------------

Total Cost Effectiveness ($/ton), 

Retrofitted Vehicles -------------

2.3.6.1.1 Annual and Daily Results 

The Annual and Daily sections of the Results table display annual baseline emissions 

information, and the emissions reduced daily and annually by applying the user-selected control 

technologies. The Baseline of Entire Fleet row displays annual emissions of NOx, PM, HC, CO, 

and CO2 without any emissions controls. The Baseline of Vehicles Retrofitted shows the 

uncontrolled emissions of each of the five pollutants from only the vehicles that will be 

retrofitted with a control technology. For example, if there are 100 vehicles in a fleet, and 50 

vehicles are going to be retrofitted with emissions controls, then the Baseline of Entire Fleet will 

show the uncontrolled emissions from 100 vehicles, while the Baseline of Vehicles Retrofitted 

will show the uncontrolled emissions from 50 vehicles. Both quantities are shown in units of 

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Diesel Emissions Quantifier User's Guide 

tons/year. Percent Reduced values are the emission reduction percentages obtained after control 

technologies are applied to a fleet. Amount Reduced per Year values are the tons of pollutants 

reduced per year by applying controls. These values converted to kilograms per day are 

displayed in the Daily section of the table. The Diesel Equivalent of CO2 emissions, in gallons 

per year, is displayed in the last column. 

2.3.6.1.2 Lifetime Results 

The Lifetime Emissions section of the Results table displays the emissions that are 

estimated to occur over the remaining lifetime of all vehicle groups in a fleet. The Baseline of 

Entire Fleet, Baseline of Vehicles Retrofitted, Percent Reduced, and Amount Reduced values are 

analogous to the values in the Annual and Daily results. The calculations used to derive these 

values are provided in Appendix B. Amount Emitted after Retrofit, Entire Fleet values are the 

lifetime emissions, in tons, of the entire fleet after the user-selected control technologies are 

applied. Amount Emitted after Retrofit, Retrofitted Vehicles values are the lifetime emissions, in 

tons, of only the retrofitted vehicles after the user-selected control technologies are applied. The 

Diesel Equivalent of CO2 emissions, in gallons, is displayed in the last column. 

Capital Cost Effectiveness is calculated by dividing the total unit and installation costs of 

all retrofits in the fleet by the Amount Reduced. These values are only calculated if the user 

enters unit and installation costs on the Fleet Information screen. Any technologies that increase 

emissions are excluded from the Capital Cost Effectiveness calculation. Total Cost 

Effectiveness is calculated by dividing the total cost of the retrofit project (capital costs, 

administrative costs, etc.) by the Amount Reduced. In this calculation, any emission increases 

from control technologies are not included in the Amount Reduced. Total Cost Effectiveness is 

only calculated if the user enters funding information on the Fleet Information screen. See 

Appendix B for details on how these calculations are performed. Total Cost Effectiveness 

results are displayed in the Emissions Results table, and not in the Detailed Results table. 

The following note appears below the Lifetime emissions results: 

"The lifetime results are dependent on each vehicle group's remaining life. To determine 

the remaining life for each vehicle group, divide the lifetime results by the annual results 

using the Detailed Results tables below." 

The funding data are displayed in a table below the Lifetime Emissions table. 

2.3.6.1.3 Preview/Download Data: Detailed Results and Download Data Tabs 

Before downloading data, the user can preview the data in the Detailed Results section, 

which appears as the second tab on the Results screen. This tab takes the user to the Detailed 

Results. These tables present results for each subgroup of vehicles that share the same control 

technologies. The first Detailed Results table presents annual data, and the second table presents 

lifetime data. 

Page 12 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

The following two download options appear on the Download Data: 

View/Download Detailed Report: To download all the data entered in addition to the 

calculated data from the Results tables, the user must select the format by clicking either "as 

Microsoft Excel file" or "as CSV (comma separated values) file." The downloaded data file can 

be submitted to the EPA. This option is not available for Marine Vessels. 

View/Download Summary Report: This option appears if the user selected "Preparing data for 

the EPA?" from the Select Scenario option on the Start screen. The user has the option to 

download the data in either Excel or CSV format. CSV files can be opened by many desktop 

spreadsheet and database applications. 

This option allows the user to download a data file that is a condensed version of the 

Annual, Daily and Lifetime Results tables. This condensed data file may be selected by users 

applying for EPA grant funds as part of a grant application. This file contains the relevant 

information that EPA needs to review a grant application. If the user has already received grant 

funds, this file can be used to report required data to the EPA. 

When the user clicks on "as Microsoft Excel file" or "as CSV (comma separated values) 

file," a dialog box will appear on the screen that lets the user open the file or save it to disk. 

2.3.6.1.4 Benefits Module Tab 

When the user clicks on the Health Benefits Tab on the Emission Results page, the user 

will be taken to the Benefits Module entry screen. 

2.3.6.1.4.1 Entry Screen 

The Entry Screen of the Benefits Module allows the user to enter up to five counties that 

will be affected by the emission reductions resulting from the retrofit technologies. The user also 

enters the percent reduction that is experienced in each county. The percent reductions must 

total to 100%. Once the user has properly defined the States, Counties, and Percent Reductions, 

they may click the "Calculate Health Benefits" button to take them to the results screen. 

2.3.6.1.4.2 Results Screen 

The Results Screen of the Benefits Module displays the Annual Diesel PM Reduction 

(tons) and the Annual Benefits ($) on a per county and total basis. The total Annualized Cost of 

the retrofit project is also displayed. Counties will appear with one asterisk if the benefits for 

that county are likely underestimated and two asterisks if the benefits are likely overestimated. 

Additionally, explanatory text will appear below the results table. 

2.3.6.1.4.3 View/Download Benefits Module Results 

To download the Results tables, the user must select the format by clicking either "as 

Microsoft Excel file" or "as CSV (comma separated values) file" at the bottom of the Results 

Screen. The user will then have the option to either view or download the results. 

U.S. Environmental Protection Agency Page 13 
Diesel Emissions Quantifier User's Guide 

3. Quick Start Tab 

This tab will provide the user with basic information that they will need before using the 

Quantifier (e.g., Necessary Inputs). 

4. References Tab 

On this tab the user can find links to References that users of the Quantifier might need. 

Page 14 U.S. Environmental Protection Agency 
 

Diesel Emissions Quantifier User's Guide 

Appendix A: 

Drop-down List Options 

Table A-1: 

Vehicle Types and Associated Target Fleets 

Vehicle Type Target Fleet 

On Highway School Buses 

Transit Buses 

Refuse Hauler 

Short Haul 

Long Haul 

Delivery Truck 

Emergency Vehicle 

City/County Vehicle 

NonRoad Agriculture 

Port and Airports 

Rail 

Construction 

Stationary 

Table A-2: 

Target Fleets and Associated Class/Equipment 

Target Fleet Class/Equipment 

Refuse Hauler, Short Haul, Long Haul, Delivery 

Truck, Emergency Vehicle, City/County Vehicle 

Class 5 (16,001 – 19,500 lbs.) 

Class 6 (19,501 – 26,000 lbs.) 

Class 7 (26,001 – 33,000 lbs.) 

Class 8a (33,001 – 60,000 lbs.) 

Class 8b (60,001 and over) 

School Buses School Buses 

Transit Buses Transit Buses 

(cont.) 

U.S. Environmental Protection Agency Page A-1 
Diesel Emissions Quantifier User's Guide 

Table A-2: 

Target Fleets and Associated Class/Equipment (cont.) 

Target Fleet Class/Equipment 

Agriculture 2-Wheel Tractors 

Agricultural Mowers 

Agricultural Tractors 

Balers 

Combines 

Irrigation Sets 

Logging Equip. Fell/Bunch/Skidders 

Logging Equipment Chain Saws > 6 

Logging Equipment Shredders > 6 

Off-Highway Tractors 

Off-Highway Trucks 

Other Agricultural Equipment 

Sprayers 

Swathers 

Tillers > 6 HP 

Construction Bore/Drill Rigs 

Cement & Mortar Mixers 

Concrete/Industrial Saws 

Cranes 

Crawler Tractors 

Crushing/Proc. Equipment 

Dumpers/Tenders 

Excavators 

Forklifts 

Graders 

Light Commercial Air Compressors 

Light Commercial Gas Compressors 

(cont.) 

Page A-2 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

Table A-2: 

Target Fleets and Associated Class/Equipment (cont.) 

Target Fleets Class/Equipment 

Construction (cont.) Light Commercial Generator Sets 

Light Commercial Pressure Washer 

Light Commercial Pumps 

Light Commercial Welders 

Off-Highway Tractors 

Off-Highway Trucks 

Other Construction Equipment 

Pavers 

Paving Equipment 

Plate Compactors 

Rollers 

Rough Terrain Forklifts 

Rubber Tire Dozers 

Rubber Tire Loaders 

Scrapers 

Signal Boards 

Skid Steer Loaders 

Surfacing Equipment 

Sweepers/Scrubbers 

Tampers/Rammers (unused) 

Tillers > 6 HP 

Tractors/Loaders/Backhoes 

Trenchers 

Port and Airports AC Refrigeration 

Aerial Lifts 

Airport Support Equipment 

Cranes 

Forklifts 

(cont.) 

U.S. Environmental Protection Agency Page A-3 
 

 

Diesel Emissions Quantifier User's Guide 

Table A-2: 

Target Fleets and Associated Class/Equipment (cont.) 

Target Fleet Class/Equipment 

Port and Airports (cont.) Light Commercial Air Compressors 

Light Commercial Gas Compressors 

Light Commercial Generator Sets 

Light Commercial Pressure Washer 

Light Commercial Pumps 

Light Commercial Welders 

Off-Highway Tractors 

Off-Highway Trucks 

Other Construction Equipment 

Other General Industrial Equipment 

Other Material Handling Equipment 

Signal Boards 

Skid Steer Loaders 

Terminal Tractors 

Rail Aerial Lifts 

Cranes 

Forklifts 

Light Commercial Air Compressors 

Light Commercial Generator Sets 

Light Commercial Pressure Washer 

Line Haul Locomotive 

Off-Highway Tractors 

Off-Highway Trucks 

Other General Industrial Equipment 

Other Material Handling Equipment 

Passenger Locomotive 

Switch Locomotive 

Terminal Tractors 

Tractors/Loaders/Backhoes 

(cont.) 

Page A-4 U.S. Environmental Protection Agency 
 

Diesel Emissions Quantifier User's Guide 

Table A-2: 

Target Fleets and Associated Class/Equipment (cont.) 

Target Fleet Class/Equipment 

Stationary Air Compressor 

Gas Compressor 

Irrigation 

Power Generation 

Pump 

Welding 

Marine Container 

Ferry/Excursion 

Tug Boat/Tow Boat 

Commercial Fishing 

Commercial Charter Fishing 

Crew and Supply 

Pilot 

Work Boat 

Other 

U.S. Environmental Protection Agency Page A-5 
Diesel Emissions Quantifier User's Guide 

Table A-3: 

Horsepower Options 

Horsepower 

0 

1 

3 

6 

10 

11 

16 

20 

25 

30 

35 

40 

45 

49 

50 

60 

70 

75 

80 

90 

100 

110 

120 

130 

140 

150 

160 

175 

180 

190 

(cont.) 

Page A-6 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

Table A-3: 

Horsepower Options (cont.) 

Horsepower 

200 

220 

240 

250 

300 

320 

350 

400 

425 

450 

475 

500 

550 

600 

700 

750 

800 

900 

950 

1000 

1200 

1300 

1400 

1500 

1600 

1700 

1800 

1900 

2000 

2250 

(cont.) 

U.S. Environmental Protection Agency Page A-7 
Diesel Emissions Quantifier User's Guide 

Table A-3: 

Horsepower Options (cont.) 

Horsepower 

2500 

2750 

3000 

3250 

3500 

4000 

4250 

4500 

5000 

5500 

6000 

6500 

Table A-4: 

Displacement Options 

Displacement 

size < 0.9 

0.9 < = size < 1.2 

1.2 < = size < 2.5 

2.5 < = size < 3.5 

3.5 < = size < 5.0 

5.0 < = size < 15.0 

15.0 < = size < 20.0 

20.0 < = size < 25.0 

25.0 < = size < 30.0 

Page A-8 U.S. Environmental Protection Agency 
 

 

 

Diesel Emissions Quantifier User's Guide 

Table A-5: 

Fuel Types 

Fuel Type CO2 Factor Rules 

LPG 0.65 Always available. 

LNG 0.61 Always available. 

CNG (lbs) 0.16 Always available. 

CNG (ft3) 0.0074 Always available. 

Biodiesel 100 0.92 Always available. 

Biodiesel 20 0.985108 Always available. 

Biodiesel 5 0.996277 Always available. 

Biodiesel 2 0.998511 Not available to any vehicles or as a reduction 

technology. 

E85 0.626126 Always available. 

Regular Diesel, 3,400 ppm Not available for On Highway, available for NonRoad 

for retrofit years up to and including 2006. 

High Sulfur Non-Road Locomotive 

and Marine Diesel Fuel, 3,400 ppm 

1 Available for Marine for model years up to and 

including 2010. 

Ultra Low Sulfur Diesel (ULSD), 15 

ppm 

1 Not available for On Highway, available for NonRoad 

and Marine. 

Emulsion 1 Always available. 

Regular Diesel (LSD), 500 ppm 1 Not available for On Highway, available for NonRoad 

for retrofit years from 2007 – 2009. 

Regular Diesel/Marine Diesel Fuel 

(LSD), 500 ppm 

1 Available only for Marine Vessels for retrofit years 

from 2007 – 2012. 

Low Sulfur Diesel (LSD), 500 ppm 1 Available for On Highway and NonRoad for retrofit 

years prior to 2007. 

Regular Diesel (ULSD), 15 ppm 1 Available for On Highway, not available for NonRoad. 

U.S. Environmental Protection Agency Page A-9 
Diesel Emissions Quantifier User's Guide 

Table A-6: 

Retrofit Technology Types and Associated Technologies 

Retrofit Technology Type Retrofit Technology 

Emissions Control Devices Diesel Oxidation Catalyst 

Diesel Oxidation Catalyst + B10 

Diesel Oxidation Catalyst + B20 

Diesel Oxidation Catalyst + B100 

Diesel Oxidation Catalyst + Closed Crankcase Ventilation + B10 

Diesel Oxidation Catalyst + Closed Crankcase Ventilation + B20 

Diesel Oxidation Catalyst + Closed Crankcase Ventilation + B100 

Diesel Oxidation Catalyst + Emulsion 

Diesel Oxidation Catalyst + Closed Crankcase Ventilation + 

Emulsion 

Diesel Particulate Filter 

Diesel Particulate Filter + ULSD (for NonRoad only) 

Diesel Oxidation Catalyst + Closed Crankcase Ventilation 

Diesel Particulate Filter + Closed Crankcase Ventilation 

Diesel Oxidation Catalyst + Closed Crankcase Ventilation + 

ULSD (for NonRoad only) 

Diesel Oxidation Catalyst + ULSD (for NonRoad only) 

Hybrid Electric Replacement with Diesel Particulate Filter 

Partial Flow Filter 

Compressed Natural Gas (CNG) Replacement 

Lean NOx Catalyst/Diesel Particulate Filter 

Recalibration 

Selective Catalytic Reduction 

Exhaust Gas Recirculation + Diesel Particulate Filter 

Other 

(cont.) 

Page A-10 U.S. Environmental Protection Agency 
 

 

 

Diesel Emissions Quantifier User's Guide 

Table A-6: 

Retrofit Technology Types and Associated Technologies (cont.) 

Retrofit Technology Type Retrofit Technology 

Fuel Options Ultra Low Sulfur Diesel (ULSD) 

Compressed Natural Gas 

Liquid Natural Gas 

Biodiesel (B20) 

Biodiesel (B100) 

Emulsion 

Hybrid Hybrid 

Weight Reduction 100 lbs 

500 lbs 

1000 lbs 

5000 lbs 

Trailer Strategies 45 Foot Trailer 

48 Foot Trailer 

53 Foot Trailer 

Double 

Rocky Mountain Double 

Turnpike Double 

Triple 

Tire Technology Single Wide Tires 

Automatic Tire Inflation 

Other Fuel Efficient Tire 

Advanced Lubricant Technology 

Strategies 

Low Friction Engine Lubricant 

Low Friction Drive Train Lubricant 

Other Advanced Lubricant Technology Strategies 

Engine and Truck Upgrades Direct Drive 

Single Axle vs. Double 

(cont.) 

U.S. Environmental Protection Agency Page A-11 
 

 

 

Diesel Emissions Quantifier User's Guide 

Table A-6: 

Retrofit Technology Types and Associated Technologies (cont.) 

Retrofit Technology Type Retrofit Technology 

Speed Management Policy 65 mph 

64 mph 

63 mph 

62 mph 

61 mph 

60 mph 

59 mph 

58 mph 

57 mph 

56 mph 

55 mph 

Aerodynamic Devices Aero Profile Tractor 

Cab Over Engine Tractor 

Integrated Cab Roof Fairing 

Cab Roof Fairing 

Cab Roof Deflector 

Cab Side Fairing 

Cab Front Air Dam Front Bumper 

Cab Aerodynamic Mirrors 

Nose Cone 

Trailer Tails 

Trailer Gap 44" – 36" 

Trailer Gap 35" or less 

Trailer Side Skirts 

Flatbed Trailer Tarps 

(cont.) 

Page A-12 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

Table A-6: 

Retrofit Technology Types and Associated Technologies (cont.) 

Retrofit Technology Type Retrofit Technology 

Engine Replacement/Repower Engine Repower 

Engine Replacement 

Idling Control Strategies Direct Fired Heater 

Auxiliary Power Unit 

Truck Stop Electrification 

Driver Tag Teams 

Double Drivers 

Engine Shutdown 

Other 

U.S. Environmental Protection Agency Page A-13 
Diesel Emissions Quantifier User's Guide 

[This page intentionally left blank.] 

Page A-14 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

Appendix B: 

Quantifier Calculations 

1. Overview 

This document provides a brief overview of the calculations used in computing the 

emissions results produced by the Diesel Emissions Quantifier. 

Equations and inputs are presented in two columns. The parentheses following each 

entry denote the units of the result of computing the expression on the left. For inputs, brackets 

following each entry denote whether the input is taken from the database ("[d]"), user input 

("[u]"), a database default or a user input value ("[d/u]"), or embedded into business logic ("[e]"). 

Textual references (e.g., "total number of vehicles in the fleet") have been replaced by 

symbolic equivalents (e.g., n Σ ) as defined below. 

2. Symbols 

These symbols take on different meanings depending on their parameters, or if they are 

constrained to a particular set of values. 

t Vehicle type (one of "NonRoad" (tnr ) or "On Highway" (thw )) [d] 

p Pollutant type (one of "CO," "CO2," "HC," "PM," "NOx") [d] 

ks,t Conversion factor from units s to units t [e]
 

Mn Results calculation n [e] 

3. Inputs 

Calculations require several inputs, as noted below. 

n Σ Number of vehicles (veh) [u]
 

n Number of vehicles retrofitted with a given technology (veh) [u] 

nengine Number of a given unique engine type (Marine Vessels Only) [u]
 

HP Horsepower [u] 

VMT Vehicle miles traveled (mi/veh/yr) [u]
 

ud Default usage rate (hr/veh/yr) [d] 

U.S. Environmental Protection Agency Page B-1 
 

 

I 

Diesel Emissions Quantifier User's Guide 

u Actual usage rate (hr/veh/yr) [u] 

u fd Default fuel usage rate (Rail only) (gal/veh/yr) [d] 

u f Actual fuel usage rate (Rail only) (gal/veh/yr) [d] 

Total idling hours per year (hr/veh/yr) [u] 

IR Idling hours reduced per year (hr/veh/yr). Used only with idling control strategies [u] 

m Emissions for pollutant p of vehicle type t (tons/mi/mo/veh for On Highway, p t, 

tons/hr/yr/veh for NonRoad [d] 

I 

m Idling emissions for pollutant p of vehicle type t (ton/hr/veh | ton/hr/veh) [d] p t, 

rp Emissions reduction for pollutant p of a given technology (dimensionless) [d/u] 

s Scrappage rate sum for a given vehicle's age and retrofit year. A table of 

scrappage rate sums is provided in Table C-1 of Appendix C [d] 

f Total fuel usage (gallons) [u] 

fi Fuel usage during idling (gallons) [u] 

Cu Unit cost for a particular emissions technology ($) [d] 

Ci Installation cost for a particular emissions technology ($) [d] 

CT Total project funding ($) [u]
 

4. Conversion Factors and Constants 

Numeric literals have been replaced by their appropriate conversion factor or constant 

below. 

k , = 12 Months in a year (months/year) mo yr 

k , = 907.18474 Kilograms in a ton (kg/ton) kg ton 

k yr,d = 1/ 365 ≈ 2.7397 ×10−3 Years in a day (years/day) 

k , Diesel-equivalent fuel emissions of pollutant p p ton 

(gallons/ton) [d] 

Page B-2 U.S. Environmental Protection Agency 
 

Diesel Emissions Quantifier User's Guide 

CO2 fuel factor The following factors are used to convert non-diesel fuels 

into diesel equivalent gallons: 

● LPG: 0.65; 

● LNG: 0.61; 

● CNG (lbs): 0.16; 

● CNG (ft3

): 0.0074; 

● Biodiesel 100: 0.92; 

● Biodiesel 20: 0.985108; 

● Biodiesel 5: 0.996277; 

● Biodiesel 2: 0.998511; and 

● E85: 0.626126. 

Ui	 Idling fuel usage factor (gallons/hour) [d] 

I	 −6 m PM ,thw = 4.29901411 x 10	 On Highway idling emissions factor for PM (g/hr/yr/veh) 

I	 −4

m NOx,thw =1.58732829 x 10	 On Highway idling emissions factor for NOx
 

(g/hr/yr/veh)
 

I

mHC t , = 0	 On Highway idling emissions factor for HC (g/hr/yr/veh) hw 

I 

m = 0	 On Highway idling emissions factor for CO (g/hr/yr/veh) CO t , hw 

5. Results Calculations 

5.1 Daily/Annual Emissions Results Calculations 

● M1t hw - On Highway fleet baseline emissions (tons/year): 

-- Non-CO2: 

M 1t oper mo,yr p,t hw	 = k ⋅ m hw ⋅ n VMT Σ

M1 = m

I 

p,thw ⋅ n I t idle hw Σ

M 1t hw = M 1thwoper + M1thwidle 

-- Total CO2 (running + idling) baseline emissions: 

M1 = f ⋅ CO2 t fuel factor ⋅ 0.0111 hw 

-- CO2 from idling if user enters non-zero idling hours (I): 

The following equation results in gallons per year. This quantity can be used to 

determine idling emissions as follows: 

U.S. Environmental Protection Agency	 Page B-3 
 

 

 

 

 

 

Diesel Emissions Quantifier User's Guide 

fi = Idling Fuel Usage Factor ⋅ I ⋅ nΣ 

M thw 1 = f i ⋅ CO fuel factor 2 ⋅ 0.0111

● M1tnr - NonRoad fleet baseline emissions (tons/year): 

-- Non-CO2 (non-Rail): 

u M = m ⋅ n ⋅ 1t oper p nr ,t nr Σ

ud 

M = m

I 

p,t ⋅ n ⋅ I 1t idle nr nr Σ

M 1t nr = M 1t oper + M1t idle nr nr 

-- Non-CO2 (Rail): 

u

M = m ⋅ n ⋅ f 

1t oper p,t nr nr Σ

u fd 

M = m

I 

p,t ⋅ n ⋅ I 1t idle nr nr Σ

M 1t nr = M 1tnroper + M1tnridle 

-- Non-CO2 (Rail - Line-Haul, Passenger and Switch Locomotives): 

1ton Mltnr = n ⋅ Locomotive Emission Factor ⋅ HP ⋅ Activity Hours ⋅ Σ 907184.74 g 

Locomotive Emission Factors are pulled from the database, and default Activity 

Hours are listed in Table D-1. The year in use used to look up the Activity Hours 

is determined by the following: (calendar year - model year) + 1. The Quantifier 

automatically enters this value into the Usage Rate field, but the user can change 

it. 

-- Non-CO2 (Marine Vessels): 

1ton Mltnr = nengines ⋅ Marine Emission Factor ⋅ HP ⋅ Load Factor ⋅ Activity Hours ⋅ 

907184.74 g 

Marine Emission Factors and Load Factors are pulled from the database. The 

Activity Hours are input by the user and cannot exceed the number of hours in a 

year (8760). 

-- CO2: 

M1 = f ⋅CO2 t fuel factor ⋅ 0.0111 hw 

Page B-4 U.S. Environmental Protection Agency 
 

 

 

 

Diesel Emissions Quantifier User's Guide 

● M - On Highway retrofitted baseline emissions (tons/year): 2t hw 

-- Non-CO2: 

M 2t = k ⋅ m ⋅ n ⋅VMT hwoper mo,yr p,thw 

M = m

I 

p,t ⋅ n ⋅ I 2t idle hw hw 

M 2t = M + M hw 2thwoper 2thwidle 

-- CO2: 

M 2 t = (n / n Σ ) ⋅ f ⋅ CO fuel factor 2 ⋅ 0.0111 hw 

●	 M2t nr - NonRoad retrofitted baseline emissions (tons/year): 

-- Non-CO2 (non-Rail): 

u M = m ⋅ n ⋅ 2t oper p,t nr nr ud 

M = m

I 

p,t ⋅ n ⋅ I 2t idle nr nr 

M 2t = M 2t oper + M2t idle nr nr nr

-- Non-CO2 (Rail): 

u

M = m ⋅ n ⋅ f 

2tnroper p,tnr u
 fd
 

M = m

I 

p,t ⋅ n ⋅ I 2t idle nr nr 

M 2t nr = M 2tnroper + M2tnridle 

-- Non-CO2 (Rail - Line-Haul, Passenger and Switch Locomotives): 

1ton M 2tnr = n ⋅ Locomotive Emission Factor ⋅ HP ⋅ Activity Hours ⋅ 

907184.74 g 

Locomotive Emission Factors are pulled from the database, and default Activity 

Hours are in Table D-1. 

-- Non-CO2 (Marine Vessels): 

M 2tnr = Mltnr 

U.S. Environmental Protection Agency	 Page B-5 
 

 

 

Diesel Emissions Quantifier User's Guide 

-- CO2: 

M 2t = (n / n Σ ) ⋅ f ⋅ CO fuel factor 2 ⋅ 0.0111 nr 

-- CO2 (Marine Vessels): 

M 2tnr = Mltnr 

● Md3 - Emissions percent reduction (dimensionless): 

Md3 = rp 

● M , - Emissions reduction, tons per year (tons/year): d3t hw Md3t nr 

-- For NonRoad, and On Highway: 

M = M ⋅r d 3toper 2t p 

If more than one technology is applied to a set of vehicles, each technology after 

the first is applied to a reduced retrofitted baseline. That is, the first technology 

reduces the original retrofitted baseline, the second technology is applied to the 

reduced retrofitted baseline that remains after the first technology is applied, the 

third technology is applied to the retrofitted baseline that remains after two 

technologies are applied, etc. 

-- For Non-CO2 emissions of On Highway vehicles using idling control strategies, 

the idling reduction is the lesser of: 

1. The total emissions of retrofit vehicles; and 

2. Md 3tidle = m

I 

p,t ⋅ IR ⋅ nrp
 

M d 3t d = M 3t + M2t oper idle 

-- For CO2 emissions of On Highway vehicles using idling control strategies, the 

emission reduction is: 

M = U ⋅ n ⋅ I ⋅ CO Fuel Factor ⋅ 0.0111 ⋅ r d 3t i R idle 2	 p

● Md4t - On Highway/NonRoad emissions reduction, kilograms per day (kg/day): 

M	 = M ⋅ k ⋅ k d 4t d 3t yr.d kg ,ton 

●	 Diesel Equivalent, gallons per year: 

Diesel Equivalent = CO2 tons/0.0111 

Page B-6	 U.S. Environmental Protection Agency
Diesel Emissions Quantifier User's Guide 

●	 Diesel Equivalent, gallons per day: 

Diesel Equivalent = Diesel Equivalent (gal/year) * kyr,d 

5.2 Lifetime Emissions Results Calculations 

● Ml3t - Lifetime fleet baseline emissions (tons): 

-- On Highway: Ml = M ⋅ s 3t lt hw hw 

-- NonRoad: 

Median Life (M) is pulled from the database. A table of Median Life values is 

provided in Table C-2 in Appendix C. 

Iteration Limit (L): the lesser of (2 x M) and 30 

Age from New (Y): (Calendar Year - Model Year) + 1 

Age Ratio (A) = Y/M 

The value for A is used to determine the Cumulative Percent Scrapped (CPS) for 

a given year. The Cumulative Percent Scrapped is determined using the values in 

Table C-3 in Appendix C and linear interpolation. 

Survival Rate (for a given year) = 1 - CPS 

Number of iterations of Age Ratio required to calculate total Survival Rate = 

(L – Y) + 1. 

For each iteration, Y = Y + 1 and the Age Ratio is calculated until Y = L. For 

each Age Ratio, the Survival Rate is calculated. The Survival Rates from all of 

these iterations are then summed. 

M l3t nr	 = Survival Rate Sum ⋅ M1tnr 

-- Non-CO2 for Rail (Line-Haul and Passenger Locomotive) 

40th Year 1ton M = n ⋅ Locomotive Emission Factor ⋅ HP ⋅ ∑ Activity Hours ⋅ l3t nr Σ

Retrofit Year 907184.74 g 

The retrofit year is determined by: (Calendar Year - Model Year) + 1 

U.S. Environmental Protection Agency	 Page B-7 
 

Diesel Emissions Quantifier User's Guide 

If the user changes the activity hours, and the user-defined value is smaller than 

the default value of the retrofit year, the user-defined value is used in the sum for 

each year until the user-defined value exceeds the default value. 

-- Non-CO2 for Rail (Switch Locomotive) 

70th Year 1ton Ml3t = nΣ ⋅ Locomotive Emission Factor ⋅ HP ⋅ ∑ Activity Hours ⋅ nr 

Retrofit Year 907184.74 g 

The retrofit year is determined by: (Calendar Year - Model Year) + 1 

If the user changes the activity hours, and the user-defined value is smaller than 

the default value of the retrofit year, the user-defined value is used in the sum for 

each year until the user-defined value exceeds the default value. 

-- CO2 for Rail (Line-Haul, Passenger, Switch Locomotive) 

M l3t nr	 = Survival Rate Sum ⋅ M1tnr 

● Ml4t - Lifetime retrofitted baseline emissions (tons): 

-- On Highway: M = M ⋅ s l 4t 2t hw hw 

-- NonRoad: M l 4t = M 2t ⋅ Survival Rate Sum nr nr 

-- Non-CO2 for Rail (Line-Haul or Passenger Locomotive): 

40th Year 1ton Ml 4t = n ⋅ Locomotive Emission Factor ⋅ HP ⋅ ∑Activity Hours ⋅ nr 

Retrofit Year 907184.74 g 

-- Non-CO2 for Rail (Switch Locomotive): 

70th Year 1ton Ml 4t = n ⋅ Locomotive Emission Factor ⋅ HP ⋅ ∑ Activity Hours ⋅ nr 

Retrofit Year 907184.74 g 

-- CO2 for Rail (Line-Haul, Passenger, Switch Locomotive) 

M l 4t = M 2t ⋅ Survival Rate Sum nr nr 

● Ml3 - Lifetime emissions percent reduction (percent): 

Ml3 = rp 

● Ml5t - Lifetime emissions reduction (tons): 

M	 = M ⋅ r l 5t l 4t p 

Page B-8	 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

● Ml6t - Post-retrofit lifetime emissions for fleet (tons): 

M l 6t l = M 3t l − M 5t 

● Ml7t - Post-retrofit lifetime emissions for retrofitted vehicles (tons): 

Ml7t = Ml 4t − Ml5t 

● Ml8t - Capital cost effectiveness for retrofitted vehicles ($/ton): 

n(Cu + Ci ) M l8t = ∑ M l5t 

The summed quantity is calculated for each technology that is applied to a vehicle 

subgroup. Any technologies that increase emissions should be excluded from these 

calculations (i.e., the number of vehicles retrofitted, installation cost, unit cost, and 

emissions increases should not be included in the sum). 

● Ml9t - Total cost effectiveness for retrofitted vehicles ($/ton): 

C M 9 = T 

lt M l t 5 
 

If any technology causes an increase in emissions, that emissions increase is excluded 

from the Lifetime Emissions Reduction amount (Ml5t). 

● Diesel Equivalent, gallons: 

Diesel Equivalent = CO2 tons/0.0111 

6. Special Cases 

When certain types of emissions reductions technologies are selected, the results 

calculations change, depending on the technology selected. 

6.1 Vehicle and Engine Replacement/Repower Strategies 

In these strategies, an aging vehicle's engine is replaced with a new one of a different 

model year. If selected, the user supplies the new engine's model year y as an additional input 

parameter for the technology. The default percent reduction rp for a particular pollutant p is then 

computed by comparing the old vehicle's emissions mp,t against the new vehicle's emissions, 

my

p,t rather than pulled from the database. 

U.S. Environmental Protection Agency	 Page B-9 
Diesel Emissions Quantifier User's Guide 

The computed percent reduction becomes: 

m − m y 

p t, p t, rp 

′ = 

m p t, 

and this value should be used in place of rp for all calculations in Section V. 

6.2 Trailer Strategies 

When trailer strategies are selected as a control technology, only the calculation of the 

CO2 baseline of retrofitted vehicles is affected. M2thw is calculated as follows: 

r

M 2t = (n / nΣ ) ⋅ f ⋅ CO2 fuel factor ⋅ 0.0111⋅ p 

hw 1− rp 

6.3 Aerodynamic Devices 

Aerodynamic devices reduce fuel consumption during operation, so the percent reduction 

should only be applied to running emissions. The equation for CO2 emissions reduced when 

aerodynamic devices are employed is as follows: 

M d 3t = rp ⋅ ( f − fi ) ⋅ CO2 fuel factor ⋅ 0.0111 

7. Benefits Module 

The Benefits Module will perform health benefits calculations using the following 

methodology: 

● On Highway Tons reduced per county: 

On Highway Tons reduced = (Σ Tons reducedOnHighway i county , ) ⋅ %Allocatedcounty

● NonRoad Tons reduced per county: 

NonRoad Tons reducedcounty = (Σ Tons reducedNonRoad , i ) ⋅ %Allocatedcounty 

● Total Tons reduced per county: 

Total Tons reducedcounty = On Highway Tons reducedcounty + NonRoad Tons reducedcounty 

Page B-10 U.S. Environmental Protection Agency 
 

Diesel Emissions Quantifier User's Guide 

● Total Tons Reduced: 

Total Tons reduced total	 = Σ Total Tons reducedcounty 

● On Highway Benefit per county: 

On Highway Benefitcounty = On Highway Tons reducedcounty ⋅ Benefit per Ton On Highwaycounty 

● NonRoad Benefit per county: 

NonRoad Benefitcounty = NonRoad Tons reducedcounty ⋅ Benefit per Ton NonRoadcounty 

● Annual Benefit per county: 

Annual Benefit = NonRoad	 Benefitcounty + On Highway Benefit county county

● Annual Benefit: 

Annual Benefit = Σ Annual Benefit total	 county 

●	 Annualized Cost per scenario: 

(Capital Cost ⋅ 0.03) Annual Cost = scenario	 −number of years remaining (1− (1+ 0.03)	 ) 

● Total Annual Cost: 

Total Annual Cost = Σ Annual Costscenario 

U.S. Environmental Protection Agency	 Page B-11 
Diesel Emissions Quantifier User's Guide 

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Page B-12 U.S. Environmental Protection Agency 
U.S.

 Environmental Protection Agency Page C-1 

Appendix C: 

Scrappage Rate Tables 

Table C-1: 

On Highway Scrappage Table: 

Scrappage Table Survival Fraction (Based on 1980 Vehicles) 

● Discount rate: 3% ● Scrappage rates are adjusted based on the year of retrofit. 

Vehicle 

Age 

From 

New 

(Years) 

Age at Retrofit 

New 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 

Survival % 

1 100% 0% 0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

2 100% 100% 0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

3 100% 100% 100% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

4 98.5% 98.5% 98.5% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

5 96.7% 96.7% 96.7% 98.2% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

6 94.5% 94.5% 94.5% 96.0% 97.8% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

7 92.0% 92.0% 92.0% 93.5% 95.3% 97.5% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

8 89.1% 89.1% 89.1% 90.6% 92.4% 94.6% 97.1% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

9 86.0% 86.0% 86.0% 87.5% 89.3% 91.5% 94.0% 96.9% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

10 82.7% 82.7% 82.7% 84.2% 86.0% 88.2% 90.7% 93.6% 96.7% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

11 79.1% 79.1% 79.1% 80.6% 82.4% 84.6% 87.1% 90.0% 93.1% 96.4% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 0 

12 75.4% 75.4% 75.4% 76.9% 78.7% 80.9% 83.4% 86.3% 89.4% 92.7% 96.3% 100.0% 0 0 0 0 0 0 0 0 0 0 0 0 

13 71.6% 71.6% 71.6% 73.1% 74.9% 77.1% 79.6% 82.5% 85.6% 88.9% 92.5% 96.2% 100.0% 0 0 0 0 0 0 0 0 0 0 0 

14 67.7% 67.7% 67.7% 69.2% 71.0% 73.2% 75.7% 78.6% 81.7% 85.0% 88.6% 92.3% 96.1% 100.0% 0 0 0 0 0 0 0 0 0 0 

15 63.7% 63.7% 63.7% 65.2% 67.0% 69.2% 71.7% 74.6% 77.7% 81.0% 84.6% 88.3% 92.1% 96.0% 100.0% 0 0 0 0 0 0 0 0 0 

16 59.7% 59.7% 59.7% 61.2% 63.0% 65.2% 67.7% 70.6% 73.7% 77.0% 80.6% 84.3% 88.1% 92.0% 96.0% 100.0% 0 0 0 0 0 0 0 0 

17 55.7% 55.7% 55.7% 57.2% 59.0% 61.2% 63.7% 66.6% 69.7% 73.0% 76.6% 80.3% 84.1% 88.0% 92.0% 96.0% 100.0% 0 0 0 0 0 0 0 

18 51.8% 51.8% 51.8% 53.3% 55.1% 57.3% 59.8% 62.7% 65.8% 69.1% 72.7% 76.4% 80.2% 84.1% 88.1% 92.1% 96.1% 100.0% 0 0 0 0 0 0 
Table C-1: 

On Highway Scrappage Table: 

Scrappage Table Survival Fraction (Based on 1980 Vehicles) (cont.) 

Page C-2 U.S. Environmental Protection Agency Vehicle Age From New (Years) Age at Retrofit New 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 

Survival % 19 47.9% 47.9% 47.9% 49.4% 51.2% 53.4% 55.9% 58.8% 61.9% 65.2% 68.8% 72.5% 76.3% 80.2% 84.2% 88.2% 92.2% 96.1% 100.0% 0 0 0 0 0 

20 44.2% 44.2% 44.2% 45.7% 47.5% 49.7% 52.2% 55.1% 58.2% 61.5% 65.1% 68.8% 72.6% 76.5% 80.5% 84.5% 88.5% 92.4% 96.3% 100.0% 0 0 0 0 

21 40.6% 40.6% 40.6% 42.1% 43.9% 46.1% 48.6% 51.5% 54.6% 57.9% 61.5% 65.2% 69.0% 72.9% 76.9% 80.9% 84.9% 88.8% 92.7% 96.4% 100.0% 0 0 0 

22 37.1% 37.1% 37.1% 38.6% 40.4% 42.6% 45.1% 48.0% 51.1% 54.4% 58.0% 61.7% 65.5% 69.4% 73.4% 77.4% 81.4% 85.3% 89.2% 92.9% 96.5% 100.0% 0 0 

23 33.7% 33.7% 33.7% 35.2% 37.0% 39.2% 41.7% 44.6% 47.7% 51.0% 54.6% 58.3% 62.1% 66.0% 70.0% 74.0% 78.0% 81.9% 85.8% 89.5% 93.1% 96.6% 100.0% 0 

24 30.6% 30.6% 30.6% 32.1% 33.9% 36.1% 38.6% 41.5% 44.6% 47.9% 51.5% 55.2% 59.0% 62.9% 66.9% 70.9% 74.9% 78.8% 82.7% 86.4% 90.0% 93.5% 96.9% 100.0% 

25 27.6% 27.6% 27.6% 29.1% 30.9% 33.1% 35.6% 38.5% 41.6% 44.9% 48.5% 52.2% 56.0% 59.9% 63.9% 67.9% 71.9% 75.8% 79.7% 83.4% 87.0% 90.5% 93.9% 97.0% 

26 24.8% 24.8% 24.8% 26.3% 28.1% 30.3% 32.8% 35.7% 38.8% 42.1% 45.7% 49.4% 53.2% 57.1% 61.1% 65.1% 69.1% 73.0% 76.9% 80.6% 84.2% 87.7% 91.1% 94.2% 

27 22.2% 22.2% 22.2% 23.7% 25.5% 27.7% 30.2% 33.1% 36.2% 39.5% 43.1% 46.8% 50.6% 54.5% 58.5% 62.5% 66.5% 70.4% 74.3% 78.0% 81.6% 85.1% 88.5% 91.6% 

28 19.8% 19.8% 19.8% 21.3% 23.1% 25.3% 27.8% 30.7% 33.8% 37.1% 40.7% 44.4% 48.2% 52.1% 56.1% 60.1% 64.1% 68.0% 71.9% 75.6% 79.2% 82.7% 86.1% 89.2% 

29 17.6% 17.6% 17.6% 19.1% 20.9% 23.1% 25.6% 28.5% 31.6% 34.9% 38.5% 42.2% 46.0% 49.9% 53.9% 57.9% 61.9% 65.8% 69.7% 73.4% 77.0% 80.5% 83.9% 87.0% 

30 15.5% 15.5% 15.5% 17.0% 18.8% 21.0% 23.5% 26.4% 29.5% 32.8% 36.4% 40.1% 43.9% 47.8% 51.8% 55.8% 59.8% 63.7% 67.6% 71.3% 74.9% 78.4% 81.8% 84.9% 

SUM 1826% 1726% 1626% 1566% 1513% 1468% 1428% 1395% 1363% 1332% 1304% 1275% 1243% 1209% 1173% 1133% 1089% 1040% 987% 928% 864% 795% 722% 644% 
 

 

 

 

 

 

Diesel Emissions Quantifier User's Guide 

Table C-2: 

NonRoad Median Life Table 

Target Fleet* Equipment 

Median Life 

HP 0 – 50 HP 51 – 300 

HP 301 – 

99999 

c Pavers 5.16 9.63 14.45 

c Tampers/Rammers 12.64 23.59 35.39 

c Plate Compactors 12.01 22.42 33.63 

c Rollers 5.58 10.41 15.61 

c Scrapers 4.64 8.65 12.98 

c Paving Equipment 6.81 12.72 19.07 

c Surfacing Equipment 7.55 14.10 21.15 

c Signal Boards 10.87 20.29 30.43 

c, p Trenchers 7.15 13.34 20.01 

c Bore/Drill Rigs 12.48 23.29 34.93 

c Excavators 3.88 7.24 10.86 

c Concrete/Industrial Saws 7.31 13.64 20.46 

c Cement & Mortar Mixers 21.14 39.47 59.20 

c, p, r Cranes 5.87 10.96 16.44 

c Graders 4.40 8.22 12.33 

c, a, p, r Off-Highway Trucks 2.58 4.82 7.23 

c Crushing/Proc. Equipment 6.09 11.36 17.05 

c Rough Terrain Forklifts 6.40 11.95 17.92 

c Rubber Tire Loaders 5.57 10.39 15.59 

c Rubber Tire Dozers 4.71 8.80 13.20 

c, r Tractors/Loaders/Backhoes 10.49 19.58 29.37 

c Crawler Tractors 4.53 8.45 12.68 

c, p Skid Steer Loaders 14.55 27.17 40.75 

c, a, p, r Off-Highway Tractors 4.96 9.25 13.88 

c Dumpers/Tenders 21.03 39.26 58.89 

c, p Other Construction Equipment 6.99 13.05 19.58 

(cont.) 

U.S. Environmental Protection Agency Page C-3 
 

 

Diesel Emissions Quantifier User's Guide 

Table C-2: 

NonRoad Median Life Table (cont.) 

Target Fleet* Equipment 

Median Life 

HP 0 – 50 HP 51 – 300 

HP 301 – 

99999 

p, r Aerial Lifts 31.00 57.87 86.81 

c, p, r Forklifts 2.49 4.65 6.98 

c Sweepers/Scrubbers 4.77 8.90 13.34 

p, r Other General Industrial Equipment 6.62 12.36 18.54 

p, r Other Material Handling Equipment 28.28 52.79 79.18 

p AC Refrigeration 4.34 8.09 12.14 

c Terminal Tractors 3.37 6.29 9.44 

a Two-Wheel Tractors 7.79 14.54 21.81 

a Agricultural Tractors 8.92 16.65 24.98 

a Combines 28.25 52.73 79.10 

a Balers 44.60 83.26 124.89 

a Agricultural Mowers 11.67 21.79 32.68 

a Sprayers 47.08 87.89 131.83 

a Tillers > Six HP 24.64 45.99 68.98 

a Swathers 38.52 71.91 107.86 

a Hydro Power Units 7.36 13.74 20.61 

a Other Agricultural Equipment 11.12 20.76 31.14 

a Irrigation Sets 7.76 14.49 21.73 

c, p Light Commercial Generator Sets 17.20 32.11 48.16 

c, p Light Commercial Pumps 14.43 26.93 40.39 

c, p, r Light Commercial Air Compressors 7.13 13.32 19.97 

c, p, r Light Commercial Gas Compressors 0.68 1.28 1.92 

c, p, r Light Commercial Welders 18.51 34.56 51.84 

c, p, r Light Commercial Pressure Washer 40.10 74.85 112.27 

a Logging Equipment Chain Saws > 6 60.53 113.00 169.49 

a Logging Equipment Shredders > 6 35.31 65.92 98.87 

(cont.) 

Page C-4 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

Table C-2: 

NonRoad Median Life Table (cont.) 

Target Fleet* Equipment 

Median Life 

HP 0 – 50 HP 51 – 300 

HP 301 – 

99999 

a Logging Equip Fell/Bunch/Skidders 3.32 6.20 9.30 

p Airport Support Equipment 5.79 10.81 16.21 

m Other Underground Mining Equipment 7.77 14.50 21.74 

r Switch 26.51 49.49 74.23 

r Passenger 10.17 18.98 28.46 

r Line-Haul 10.17 18.98 28.46 

* c = construction; a = agriculture; p = port-related; r = rail. 

Table C-3: 

NonRoad Default Scrappage Curve 

Age Ratio Cumulative Percent Scrapped 

0.0000 0.00 

0.0588 0.01 

0.1694 0.03 

0.2710 0.05 

0.3639 0.07 

0.4486 0.09 

0.5254 0.11 

0.5948 0.13 

0.6570 0.15 

0.7125 0.17 

0.7617 0.19 

0.8049 0.21 

0.8425 0.23 

0.8750 0.25 

0.9027 0.27 

0.9259 0.29 

0.9451 0.31 

(cont.) 

U.S. Environmental Protection Agency Page C-5 
Diesel Emissions Quantifier User's Guide 

Table C-3: 

NonRoad Default Scrappage Curve (cont.) 

Age Ratio Cumulative Percent Scrapped 

0.9607 0.33 

0.9730 0.35 

0.9824 0.37 

0.9894 0.39 

0.9942 0.41 

0.9973 0.43 

0.9990 0.45 

1.0000 0.50 

1.0010 0.55 

1.0027 0.57 

1.0058 0.59 

1.0106 0.61 

1.0176 0.63 

1.0270 0.65 

1.0393 0.67 

1.0549 0.69 

1.0741 0.71 

1.0973 0.73 

1.1250 0.75 

1.1575 0.77 

1.1951 0.79 

1.2383 0.81 

1.2875 0.83 

1.3430 0.85 

1.4052 0.87 

1.4746 0.89 

1.5514 0.91 

1.6361 0.93 

1.7290 0.95 

1.8306 0.97 

1.9412 0.99 

2.0000 1.00 

Page C-6 U.S. Environmental Protection Agency 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Diesel Emissions Quantifier User's Guide 

Appendix D: 

Locomotive Default Usage
 

Table D-1: 

Annual Activity Hours (Default Usage) for Line-Haul, 

Passenger, and Switch Locomotive 

Year in Usage Line-Haul or Passenger Switch 

1 4350 4450 

2 4350 4450 

3 4350 4450 

4 4350 4450 

5 4350 4450 

6 4350 4450 

7 4350 4450 

8 4350 4450 

9 4268 4450 

10 4187 4450 

11 4105 4450 

12 4024 4450 

13 3942 4450 

14 3861 4450 

15 3779 4450 

16 3698 4450 

17 3616 4450 

18 3534 4450 

19 3453 4450 

20 3371 4450 

21 3290 4450 

22 3208 4450 

23 3127 4450 

24 3045 4450 

25 2963 4450 

(cont.) 

U.S. Environmental Protection Agency Page D-1 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Diesel Emissions Quantifier User's Guide 

Table D-1: 

Annual Activity Hours (Default Usage) for Line-Haul, 

Passenger, and Switch Locomotive (cont.) 

Year in Usage Line-Haul or Passenger Switch 

26 2882 4450 

27 2800 4450 

28 2719 4450 

29 2637 4450 

30 2556 4450 

31 2474 4450 

32 2393 4450 

33 2311 4450 

34 2229 4450 

35 2148 4450 

36 2066 4450 

37 1985 4450 

38 1903 4450 

39 1822 4450 

40 1740 4450 

41 4450 

42 4450 

43 4450 

44 4450 

45 4450 

46 4450 

47 4450 

48 4450 

49 4450 

50 4450 

51 4383 

52 4317 

53 4250 

54 4183 

(cont.) 

Page D-2 U.S. Environmental Protection Agency 
Diesel Emissions Quantifier User's Guide 

Table D-1: 

Annual Activity Hours (Default Usage) for Line-Haul, 

Passenger, and Switch Locomotive (cont.) 

Year in Usage Line-Haul or Passenger Switch 

55 4116 

56 4050 

57 3983 

58 3916 

59 3849 

60 3783 

61 3716 

62 3649 

63 3582 

64 3516 

65 3449 

66 3382 

67 3315 

68 3249 

69 3182 

70 3115 

U.S. Environmental Protection Agency Page D-3 
Diesel Emissions Quantifier User's Guide 

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Page D-4 U.S. Environmental Protection Agency