ARB Research Seminar

This page updated June 19, 2013

Impacts of Advanced Combustion, Fuels and Aftertreatment Technologies on Diesel PM Emissions: a Ten-Year Retrospective

John M.E. Storey, Ph.D., Distinguished Research Scientist, Oak Ridge National Laboratory, Tennessee

February 11, 2009
Cal EPA Headquarters, 1001 "I" Street, Sacramento, CA



Diesel engines have undergone a profound transformation since the early 1990s as a result of engineering advancements and environmental regulation.  The on-road engine systems of 2010 will demonstrate up to a 1000-fold decrease in both particulate matter (PM) and oxides of nitrogen (NOx) emissions in comparison to their uncontrolled brethren of the 1980s.  Thermal efficiency, a measure of the useful work extracted from the total energy content of the fuel, has also increased in this time period due to improvements in turbocharging, fuel injection and electronic controls.  Dramatic reductions in both PM and mobile source air toxic (MSAT) emissions have occurred with advances in fuels, engines and emissions controls.  Awareness of particulate impacts on public health has increased the importance of exhaust particle size and number concentration as well. These trends will continue to influence on local air quality as well as require rethinking of emissions factors used in air quality modeling.

This presentation will trace the development of diesel engine emissions control technologies since the mid-1990s and provide a vision of future diesel technologies with an emphasis on PM and MSAT emissions.

Speaker Biography

John M. E. Storey, Ph.D., has been at Oak Ridge National Laboratory (ORNL) since 1992 and currently leads the emissions characterization efforts for ORNL’s Fuels, Engines, and Emissions Research Center.  He participates in both the fuels and combustion programs in this capacity.  In addition Dr. Storey does extensive research on real-world mobile source emissions.  In both arenas his research emphasizes air toxics and particulate characterization.  

Dr. Storey currently serves on the Transportation and Air Quality Committee of the Transportation Research Board, and has co-chaired Department of Energy committees on Toxics and PM Emissions from Advanced Petroleum Based Fuels.  Dr. Storey recently completed a project for EPA’s OTAQ on diesel PM retrofit devices.  Dr. Storey has also teamed with the Texas Transportation Institute on three projects assessing the emissions of Mexican heavy-duty vehicles at border crossings points. Other areas of research interest include health effects of exhaust nanoparticles and the development of instrumentation for real-time exhaust composition measurement.

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