Diesel Emissions Quantifier (DEQ)
The Diesel Emissions Quantifier (DEQ)
- Provides an interactive, web-based tool for users with little or no modeling experience.
- Evaluates clean diesel projects and upgrade options for medium-heavy and heavy-heavy duty diesel engines.
- Estimates baseline emissions, reduced emissions, cost effectiveness for NOx, PM2.5, HC, CO and CO2, and PM-related health benefits.
- Cannot provide estimates for Category 3 marine engines.
- May not be used for State Implementation Plans (SIPs) and Conformity. Consult your EPA Regional Office or SIP and Conformity guidance documents.
DEQ Helpline: DEQhelp@epa.gov
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Electrified Parking Spaces Facility: Emission Reduction Calculation (PDF)(1 pg, 456 K, May 2020)
- Diesel Emissions Quantifier Default Values (PDF)(2 pp, 200 K, April 2017)
- Locomotive Idling Guidance
- Shore Power Technology Assessment at U.S. Ports
- Diesel Emissions Quantifier Health Benefits Methodology (PDF)(46 pp, 1 MB, August 11, 2010, EPA-420-B-10-034)