Compilation of Diesel Emissions Speciation Data

CRC Project No. E-75

Leaders:          S. H. Cadle
                        D. R. Lawson

Scope and Objective

CRC and the U.S. DOE’s National Renewable Energy Laboratory (NREL) jointly sponsored a project with the following objectives:

• Compile speciated exhaust emission data from on-road diesel vehicles designed to meet U.S. emission standards.
• Provide average emission rates of large numbers of chemical species as a function of vehicle and technology category.
• Provide an assessment of the quality and completeness of the data.

The goal was to have the best available speciation profiles for comparison with data from future test programs such as ACES.

Current Status and Future Program

E.H. Pechan & Associates, Inc. (Pechan) was selected for this project through a competitive solicitation. Pechan reviewed recent studies that provided data on speciated diesel exhaust emissions from vehicles with and without the use of advanced emission reduction technologies.  In performing the literature search to determine the data sets that could be incorporated into a diesel emissions database for this project, Pechan accessed peer-reviewed materials such as journal papers (e.g., Environmental Science and Technology [ES&T]) and papers and reports from the Society of Automotive Engineers (SAE), CRC, NREL, CARB, EPA, and research institutes (e.g., University of Wisconsin, West Virginia University, University of California at Riverside).  After review and analysis of the report content and speciation methodology employed, the suitability of each reference was briefly summarized for this project in a separate spreadsheet. Over 240 references were reviewed for possible inclusion in the database.  The database and Final Report were released in late 2007.