National Clean Diesel Campaign (NCDC)
Results and Outputs
Diesel Emissions Quantifier (DEQ)
- Read Me First
- Use The Quantifier
- Frequently Asked Questions (PDF) (22 pp, 900K, EPA-420-F-13-008, April 2013)
- Default Values (PDF) (6 pp, 600K, EPA-420-B-10-035, August 2010)
- Health Benefits Methodology (PDF) (48 pp, 1.7MB, EPA-420-B-10-034, August 2010)
Need help? DEQ Trouble Shooting
The DEQ calculates emission reductions based on retrofit technologies and other information entered into the DEQ. After clicking on ‘Quantify Emissions’, you will see the ‘Emissions Results’ page with three tabs.
Summary Emissions Results Tab
This tab provides a summary of DEQ results, based on your inputs, for your entire fleet. At the bottom of this page, you will find “Total Cost Effectiveness” (if you entered project funding amounts on the first DEQ screen) and the remaining lifetime of each vehicle group. This is the ONLY page where this information is displayed.
You will need Adobe Acrobat Reader to view the Adobe PDF files on this page. See EPA's PDF page for more information about getting and using the free Acrobat Reader.
Download Results Tab
Here you can download the DEQ results as a Detailed Report or a Summary Report. Both reports are available in Excel or CSV format.
- Detailed Report spreadsheet shows all user-entered fields and all DEQ-calculated fields. Save this spreadsheet in Excel and CSV (Excel better for viewing, CSV better for importing) as it documents all user-inputs and can be used to replicate DEQ calculations. Sample Detailed Report (XLS).
- Summary Report spreadsheet includes most of the user-entered fields and all of the DEQ-calculated fields. If you are a grant applicant or current grantee, save this spreadsheet in CSV format so it can be imported into the EPA grants database. You may choose to save an Excel version also for easier viewing. Sample Summary Report (XLS).
Interpreting the Spreadsheets: Field Definitions
The DEQ calculates emission reductions for four criteria pollutants, NOx, PM, HC, CO, as well as CO2. The following seven outputs are calculated for each of the pollutants.
- Percent Reduced (%) is the percent by which the pollutant is reduced as a result of retrofitting the fleet.
- Baseline of Vehicles Retrofitted per Year (tons/year) is the baseline of annual emissions from the fleet prior to being retrofitted.
- Amount Reduced per Year (tons/year) ) is the annual tons of pollution reduced after retrofitting the fleet. This can also be calculated manually by multiplying the ‘Percent Reduced’ by the ‘Baseline of Vehicles Retrofitted per Year’.
- Lifetime Baseline of Vehicles Retrofitted is the baseline emissions for the fleet without retrofits for the remaining life of the fleet.
- Lifetime Amount Reduced is the tons of the pollutant reduced after retrofitting over the remaining life of the fleet.
- Lifetime Amount Emitted after Retrofit, Retrofitted Vehicles (tons) is the amount of the pollutant the fleet would emit after the retrofit for its remaining life. This value is found by subtracting Lifetime Amount Reduced from Lifetime Baseline of Vehicles Retrofitted.
- Capital Cost Effectiveness ($/ton), Retrofitted Vehicles is calculated by adding the ‘Unit Cost’ and ‘Installation Cost’ for specific technologies in a vehicle group and dividing it by the ‘Lifetime Amount Reduced’ for vehicles retrofitted with that technology. If these costs have not been entered at the bottom of the ‘new technology’ screen, this field will be blank.
Health Benefits Tab
This tab allows users to calculate health benefits based on the DEQ-generated annual PM reductions and the user-identified counties where the reductions occur. The cost is based on the ‘Unit Cost’ and ‘Installation Cost’ entered at the bottom of the ‘new technology’ screen. The annual benefits in dollars reflect health benefits resulting from reduced PM. Sample Health Benefits Results (XLS).