Read Me First
Diesel Emissions Quantifier (DEQ)
More Help
- 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 is an interactive tool that evaluates clean diesel projects and options for medium-and heavy-heavy duty diesel engines by estimating emission reductions, cost effectiveness, and health benefits. This quantifier was developed for users with little or no modeling experience. The DEQ does not currently provide estimates for light-heavy duty or non-heavy duty engines or vehicles, non-diesel engines or vehicles, pre-1980 engines or ocean going vessels
DEQ results can be downloaded to a spreadsheet and can provide the following information:
- Estimates of baseline emissions (annual and lifetime)
- Estimates of emission reductions, cost effectiveness and health benefits based on changes to emission control strategies for a fleet or a single diesel vehicle/engine (annual and lifetime)
- Comparison of emission reductions, cost effectiveness and health benefits for different emission control strategies (annual and lifetime)
- Assistance to EPA grantees and SmartWay carrier partners in developing data reports for submission to EPA
Before using the DEQ, please also read
- Input Checklist to learn what inputs you'll need, some basic terms and how to get the most accurate results
- Results and Outputs to learn how to download and interpret your results
- Having Trouble for help in resolving issues with your login or DEQ run
The DEQ may not be used for State Implementation Plans (SIPs) and Conformity. Please consult your EPA Regional Office or relevant SIP and conformity guidance documents.
The DEQ is unable to perform the following calculations due to the unavailability of certain data.
- Fuel economy benefits for nonroad engines with idle reduction technologies or engine replacements
- CO2 and other greenhouse gases (GHG) reductions for retrofit devices and engine repowers and/or replacements
- Health benefits from NOx, HC, and CO reductions
- Black Carbon reductions
Other Emission Reduction Calculators
Users with air quality modeling experience may wish to use one of EPA’s more technical models for quantifying the benefits of retrofit projects.
- Motor Vehicle Emission Simulator (MOVES) for on-road vehicles
- NONROAD Model for nonroad engines, equipment, and vehicles
- SmartWay FLEET Tools for freight shippers, logistics companies, and rail, trucks, multi-modal carriers
- SmartWay DrayFleet Model for drayage fleets
- Argonne National Laboratory GREET Model for lifecycles and carbon footprints