Quantifier
Overview
More Help
- Frequently Asked Questions (PDF) (20 pp, 400K, EPA-420-F-12-017, April 2012)
- Default Values (PDF) (6 pp, 600K, EPA-420-B-10-035, August 2010)
- User's Guide (PDF) (56 pp, 890K, EPA-420-B-10-033, August 2010)
- Health Benefits Methodology (PDF) (48 pp, 1.7MB, EPA-420-B-10-034, August 2010)
For assistance, contact the National Clean Diesel Quantifier Helpline
DEQ Scheduled Maintenance
Saturday June 2nd - 6 a.m. to 12 noon EDT
On Saturday, June 2nd, 2012, EPA's Diesel Emissions Quantifier (DEQ) will not be available from 6 a.m. to 12 p.m. (noon) EDT due to scheduled server maintenance. We apologize for this inconvenience. If you are applying to the National Clean Diesel Funding Assistance Program's FY12 Request for Proposals, please plan accordingly. If you have further questions regarding the DEQ, please contact the NCDC Helpline at cleandiesel@epa.gov.
The Diesel Emissions Quantifier (DEQ)
The DEQ is an interactive tool that can help evaluate clean diesel projects and options by estimating emission reductions, cost effectiveness, and health benefits. Users with air quality modeling experience may wish to use EPA’s more technical models for quantifying the benefits of retrofit projects.
State Implementation Plans (SIPs) and Conformity
The Diesel Emission Quantifier should not be used for calculating emission reductions for State Implementation Plans (SIPs) or conformity determinations. Please consult your EPA Regional Office or relevant SIP and conformity guidance documents.
Revised Emissions Factors
Update:
For DEQ calculations where the Year of Retrofit Action is 2011, 2012, or 2013 AND the Target Fleet is City/County Vehicle, Delivery Truck, Emergency Vehicle, Long Haul, Refuse Hauler, School Bus, Short Haul or Transit Bus, emissions outputs may have been overestimated.
As of October 25, 2011, this issue has been resolved. It is recommended that users rerun the DEQ using their original inputs. We apologize for any inconvenience. For more information, contact the NCDC Helpline at 1-877-NCDC-FACTS or e-mail cleandiesel@epa.gov.
Mobile Vehicle Emissions Simulator (MOVES2010) vs MOBILE6.2
In November 2010, the DEQ was updated with highway/on-road emission rates from the Mobile Vehicle Emissions Simulator (MOVES2010). This is EPA’s currently approved model for estimating emissions for highway/on-road vehicles, replacing the older MOBILE 6.2. EPA’s model for most nonroad equipment remains NONROAD2008.
MOVES2010 incorporates many significant improvements over MOBILE6.2 in baseline emissions, activity data, and calculations used to estimate emissions in real-world driving conditions. For heavy-duty diesel vehicles, one of the most important changes is the incorporation of in-use data from heavy duty engines. MOBILE6.2 used only engine certification data from new engines. As a result of these improvements, MOVES2010 emissions estimates are significantly higher than MOBILE6.2 emissions for some older model year diesel vehicles.
Comparison of sample outputs from MOVES2010 vs Mobile 6.2
| Retrofit Year |
Source of Emissions Rates |
Baseline PM Emissions (Lifetime) |
Reduced PM Emissions (Lifetime) |
|---|---|---|---|
| 2010 | MOBILE6.2 | 0.1091 tons | 0.0218 tons |
| 2011 | MOVES2010 | 0.407 tons | 0.0814 tons |
It is highly recommended that you use the MOVES2010 emission rates by selecting retrofit year 2011 or later for current and future highway/on-road projects. In summary
- If you select the Year of Retrofit Action to be 2011 or later, new MOVES2010 emission data will be used (regardless of model year).
- If you select the Year of Retrofit Action to be 2010 or earlier, old MOBILE 6.2 emission data will be used (regardless of model year).
Please see FAQs following for more details.
Frequently Asked Questions - MOVES2010 vs Mobile6.2 (Click here to expand/hide)
- Which "Year of Retrofit Action" should I use if my project spans several years, for instance 2008 to 2011?
- We recommend that you use MOVES2010 numbers by selecting 2011 as the "Year of Retrofit Action" for the entire project, even if the retrofit activity took place before 2011.
- Which model should I use if my project spans 2008 -2011 and my initial calculations used the old DEQ (MOBILE6.2) emission rates?
- We still recommend that you perform your final calculations using MOVES2010 by choosing 2011 as your "Year of Retrofit Action".
- My project has been completed and I’ve already done my calculations using the old DEQ numbers? Do I need to re-run the DEQ using 2011 as the "Year of Retrofit Action"?
- No. If your project is closed and you have already turned in your final report, there is no need to re-run the DEQ.
- If I want to continue using the old DEQ MOBILE6.2 emission rates, will I run into problems?
- You will not run into any problems using the DEQ. However, using the old MOBILE6.2 numbers for your calculations will severely under estimate your emission reductions.
DEQ Input Checklist
DEQ Inputs for Highway/On-road and Nonroad
- State
- Type Vehicle
- Fleet Count
- Target Fleet
- Class/Equipment
- Model Year
- Year Retrofit Installed
- Current Fuel Type
- Fuel Volume (annual gallons for fleet)
- Funding Amount (optional)
- Technology Applied
- New Model Year (if replacing engine/vehicle)
- Idling Hours Reduced (if reducing idle)
- Number of Retrofitted Vehicles
- Technology Cost (optional)
- Installation Cost (optional)
Additional Inputs for Highway/On-road
- Vehicle Miles (annual miles per vehicle)
- Idling Hours (annual idle hours per vehicle)
Additional Inputs for Nonroad
- Horsepower
- Usage Rate (annual hours per vehicle)
For Marine Vehicles:
- Fleet Type
- State
- Number of Engines
- Type Engine
- Engine Model Year
- Year Retrofit Installed
- Engine Activity (annual hours per engine)
- Horsepower
- Displacement (liters per cylinder)
- Fuel Volume (annual gallons per engine)