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, and certain other technical applications. Please do not continue using the Quantifier until you have read the important usage information.

Complete Quantifier User's Guide (PDF, 42 pages, 152K, About PDF)

Disclaimer

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.
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.