Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: NSCU Logo v5 



H. Christopher Frey


News Archive:


·         August 2012:  PhD student Wan Jiao has received a Student Travel Award from the Society for Risk Analysis to attend and present a paper at the SRA Annual Meeting in San Francisco in December.

·         June 2012.  Dr. H. Christopher Frey, a professor in the Department of Civil, Construction, and Environmental Engineering, received the 2012 Lyman A. Ripperton Environmental Educator Award of the Air & Waste Management Association at the Association’s annual meeting in San Antonio, TX.  The award is given each year to an influential educator in an air pollution control field.  See NCSU Press Release for more…

·         June 2012.  Four environmental engineering graduate students of Dr. Frey’s research group and of the NCSU Chapter of the Air & Waste Management Association presented technical papers at the 105th Annual Meeting of A&WMA in San Antonio, TX in June.  Each received travel scholarships from the RTP Chapter and South Atlantic States Section of A&WMA.  Wan Jiao spoke on quantifying human exposure to fine particulate matter in ambient air.  Brandon Graver, Bin Liu, and Behdad Yazdani presented papers on various aspects of vehicle emissions, including measurement of railroad locomotive emissions, modeling of highway vehicle emissions, and quantification of the effect of road grade on emissions.

·         April 2012.  New research from North Carolina State University shows that federal requirements governing diesel engines of new tractor trailer trucks have resulted in major cuts in emissions of particulate matter (PM) and nitrogen oxides (NOx) – pollutants that have significant human health and environmental impacts.  Frey and Ph.D. student Gurdas Sandhu used a portable emissions measurement system to sample exhaust from diesel trucks while the trucks were in use on roads and highways.  Compared to a 1999 truck, a 2010 truck emitted 98 percent less NOx, and the PM emissions were 95 percent lower.  See NCSU Press Release for more…

·         12/15/11.  Wan Jiao, a Ph.D. student working with Dr. H. Christopher Frey in the Department of Civil, Construction, and Environmental Engineering at NC State, received the Student Merit Award from the Exposure Assessment Specialty Group of the Society for Risk Analysis (SRA) at SRA's Annual Meeting in Charleston, SC on December 7, 2011. Ms. Jiao presented a paper on "Assessment of Inter-individual, Geographic, and Seasonal Variability in Estimated Human Exposure to PM2.5." PM2.5 refers to small particles in the air that can be inhaled into the lung, leading to the risk of adverse health effects. Ms. Jiao also received Student Travel Awards from SRA and from the Research Triangle Chapter of SRA. The Society for Risk Analysis is a multidisciplinary, interdisciplinary, scholarly, international society that provides an open forum for all those who are interested in risk analysis.

·         9/30/11.  Dr. H. Christopher Frey was reappointed by U.S. Environmental Protection Agency Administrator Lisa Jackson to a second threeyear term on the Clean Air Scientific Advisory Committee (CASAC). CASAC advises EPA on science pertaining to the National Ambient Air Quality Standards. Frey is currently chairing CASAC’s Lead Review Panel and is a member of CASAC’s Ozone Review Panel. 

·         6/30/11.  Brandon Graver, a Ph.D. student advised by Dr. H. Christopher Frey, won 2nd Place for Best Paper at the Ph.D. level at the Annual Meeting of the Air & Waste Management Association in Orlando, FL this past June. Graver’s paper was on the energy use and emissions of a plugin hybrid vehicle.

·         6/23/11.  The NC State Chapter of the Air & Waste Management Association (A&WMA) attended and presented nine technical papers in the main program of the Association’s Annual Meeting during June 2123, 2011 in Orlando, Florida.

·         Brandon Graver, an MS student working with Dr. Frey, was featured in the Southeastern Transportation Center’s Summer 2010 Research Spotlight for his work on measuring the activity, energy use, and emissions of passenger railroad locomotives.

·         Dr. Frey is starting a new collaborative research project, with Co-PI Dr. Nagui M. Rouphail, that will focus on the linkage between travel simulation and vehicle emissions models and their application to evaluation of traffic management strategies and emissions impacts.  The new project is sponsored by the U.S. Environmental Protection Agency and was selected via a scientific peer review process under the STAR grants program.  The project will be administered as a cooperative agreement with the U.S. EPA.

·         Dr. Frey’s group has recently published two new papers in Environmental Science and Technology.  One paper, by postdoctoral research associate Dr. Hyung-Wook Choi and Dr. Frey, is regarding a method for quantifying the real-world energy use and emissions of a plug-in hybrid electric school bus.  The other, by Dr. Frey, Dr. Kaishan Zhang (now with the California Air Resources Board, and Dr. Rouphail (director of the Institute for Transportation Research and Education located at NCSU) is regarding a method for modeling the emissions of individual vehicles based on second-by-second data obtained from Portable Emissions Measurement Systems.

Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: School_Bus_01Description: Description: Description: Description: Description: Description: Description: Description: Description: Description: PEMS_Main_Unit01

·         Brandon Graver, an MS student working with Dr. H. Christopher Frey, received the first place Masters level platform paper award at the 2010 Annual Meeting of the Air & Waste Management Association

·         Dr. Frey and colleagues have recently published in Transportation Research Record a methodology for inventorying construction fleet emissions.  The method is based on the use of representative real-world measurements of construction vehicles obtained by means of a portable emissions measurement system (PEMS).  Recommendations are made about development and practical applications of emissions inventories for construction fleet management. 

·         Dr. Frey and collaborators have recently published in Environmental Science and Technology a methodology for estimating high-resolution, regional on-road vehicle emissions and the associated reductions in air pollutant emissions from vehicles that utilize alternative fuels or propulsion technologies. The fuels considered are gasoline, diesel, ethanol, biodiesel, compressed natural gas, hydrogen, and electricity. The technologies considered are internal combustion or compression engines, hybrids, fuel cell, and electric. Road link-based emission models are developed using modal fuel use and emission rates applied to facility- and speed-specific driving cycles.  The methodology makes use of second-by-second data from field measurements using Portable Emission Measurement Systems (PEMS) in order to develop correction factors for real-world driving cycles.

·         In addition to previous studies in Dr. Frey’s group that compared energy use and emissions of dump trucks and construction vehicles fueled with B20 biodiesel versus petroleum diesel, we have recently published a similar study in Transportation Research – Part D that focuses on eight cement mixers.  These three studies include a combined total of 35 vehicles that were tested for approximately one day on each of the two fuels.  In general, these studies support the finding from dynamometer tests that substitution of B20 for petroleum diesel leads to reductions in tailpipe emissions of carbon monoxide, hydrocarbons, and particulate matter.  While there are differences in the effect of B20 on the emissions of nitrogen oxides from one vehicle to another, on average there was little change.  These studies also establish duty cycles for multiple types of vehicles, including dump trucks, cement mixers, front-end loaders, backhoes, and motor graders.  The newly measured duty cycles, coupled with modal emission rates obtained from in-use measurements using Portable Emission Measurement Systems, enable estimation of the effect of variations in vehicle operations on emissions.Dr. Frey and recent Ph.D. graduate Po-Yao Kuo have completed an assessment of avoided fuel use and emissions for anti-idling methods for long-haul freight trucks, in collaboration with the NC Solar Center and Volvo Technology of North America.  This assessment is based on real world data from 20 instrumented trucks.  See the November 6, 2008 press release, a video, and access the project final report.  See also a recent presentation.

·         Effective October 1, 2008, Dr. Frey will serve a three-year term as one of the seven statutory members of the Clean Air Scientific Advisory Committee (CASAC) of the U.S. Environmental Protection Agency (EPA).  See November 5, 2008 press release from NCSU’s College of Engineering.

·         In August 2008, Dr. Frey was selected to serve on a National Research Council committee that will assess methodology for quantifying uncertainty in the health effects of air pollutants.  See NCSU press release.

·         Dr. Frey received an individual NC Mobile Clean Air and Renewable Energy (CARE) Award at the 2nd Annual Mobile Clean Air and Renewable Energy (CARE) Symposium held in Greensboro, NC on May 6, 2008. 

·         Dr. Frey is a recipient of a 2008 NCSU Alumni Association Outstanding Research Award

·         Dr. Frey has been selected as a Fellow of the Air & Waste Management Association. 

·         Dr. Frey moderated a panel session on the new Energy Economy, sponsored by the student group Net Impact and the NCSU College of Management.  The session was held Friday, April 25, 2008 at 3:00 pm in 3400 Nelson Hall. 

·         Dr. Frey and his students and colleagues delivered six presentations at the CRC On-Road Vehicle Emissions Workshop, held on March 31-April 2.  Topics include real world measurements of activity, fuel use, and emissions of construction vehicles, modeling of construction vehicles, reducing idling fuel use and emissions of long-haul freight trucks, real-world measurement of cement mixers and school buses, as well as modeling of conventional and advanced vehicle technologies and their impact on urban scale energy use and emissions.

·         Dr. Frey delivered the Chairman’s Air Pollution Seminar at the California Air Resources Board in Sacramento, CA on January 9, 2008 on the topic of “Identification and Evaluation of Potential Best Practices for Greenhouse Gas Reductions in Freight Transportation.”  The related final report is available, “Best Practices Guidebook for Greenhouse Gas Reductions in Freight Transportation.”

·         Dr. Frey, colleagues, and students delivered four presentations at the Transportation Research Board (TRB) Annual Meeting in Washington, DC on January 15 and 16, 2008.

July 2008.  Frey Collaborates on Assessment of Plug-In Hybrid Electric School Buses.  See related story.

January 2007:  Frey Delivers Webinar on Reducing Greenhouse Gas Emissions from Freight Transportation.  See details at Federal Highway Administration Website.

August 2006.  Frey Begins 12 Month Assignment at U.S. Environmental Protection Agency.  Dr. H. Christopher Frey began a 12 month sabbatical from NC State to the U.S. Environmental Protection Agency on August 16, 2006 at the EPA’s National Exposure Research Laboratory (NERL) in Research Triangle Park, NC.  While at NERL, Dr. Frey co-led an agency-wide working group on the role of probabilistic risk assessment in regulatory decision making and contributed to collaborative research with EPA scientists on quantifying uncertainty in integrated modeling of air pollutant emissions, air quality, human exposure to air pollutant, and health effects.  Dr. Frey also participated in numerous other activities, such as leading a working group at a November 2006 workshop on uncertainty in models used to assess climate change.

December 2004:  Frey Elected President of the Society for Risk Analysis.  Dr. Frey was elected to a three-year term in 2004 to 2006 as President-Elect, President, and Past-President of the Society for Risk Analysis.  An international multidisciplinary scholarly society, the Society for Risk Analysis provides an open forum for researchers in the area of risk analysis, which includes risk assessment, characterization, communication, management and policymaking.

April 2004:  Frey Appointed to EPA Scientific Advisory Panel on Pesticides.  Dr. H. Christopher Frey was appointed to the US Environmental Protection Agency’s Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) scientific advisory panel.  The panel serves as the primary scientific peer review mechanism for the EPA Office of Prevention, Pesticides and Toxic Substances and provides recommendations to the EPA concerning pesticide impact on health and the environment. Frey, an internationally recognized expert in probabilistic exposure assessment, was nominated for membership by the National Institutes of Health and began his term on April 30, 2004.  He continued on the panel until August 15, 2006.

November 1999:  Frey Receives SRA’s Chauncey Starr Award.  Dr. H. Christopher Frey was selected to receive the 1999 Chauncey Starr Award from the Society for Risk Analysis (SRA). The award honors an individual under the age of 40 who has made exceptional contributions to the field of risk analysis. The award is named after Chauncey Starr, the founding president of the Electric Power Research Institute, and a pioneer in the field of risk analysis. The Society of Risk Analysis was established in 1980, with more than 2,000 members world-wide. The award was presented at the SRA Annual Meeting in Atlanta, Georgia, on December 7, 1999.

November 1999.  Frey Participates in Sigma Xi “Risk Roundtable” Symposium.  See related story at Sigma Xi website.

October 1999:  Frey Serves on IPCC Expert Working Group.  Dr. H. Christopher Frey contributed to the development of the Best Practice Guidelines of the National Greenhouse Gas Inventory Program of the Intergovermental Panel on Climate Change (IPCC). 

October 1999.  Frey Invited to NAE Frontiers of Engineering Symposium.  Dr. H. Christopher Frey was an invited participant in the National Academy of Engineering’s (NAE’s) 5th Annual Symposium on Frontiers of Engineering (FoE), held in Irvine, California.   Participants in FoE symposia are selected via a nomination process and attendance is limited in order to encourage interaction among emerging leaders in engineering.

October 1999.  Frey and Colleagues Pioneer Research on Real-World Vehicle Emissions.  See related story.

June 1997:  Frey Receives NSF CAREER Award.  Dr. H. Christopher Frey of Raleigh received a Faculty Early Career Development (CAREER) Award from the National Science Foundation. The prestigious CAREER Award, which replaces the NSF Young Investigator Award, recognizes and supports research by junior faculty.  Frey used the award to support research on, "New Methods for Systems Analysis of Environmental Technologies." The research program focuses on pollution prevention and involves development of engineering-economic models of clean technologies and new technology analysis and optimization methods that deal with uncertainty. Frey also will create detailed case studies to illustrate the use of the new system models. "The goal is to achieve lower emissions and minimize costs through better process design," said Frey. "The research will also yield more realistic estimates of technology capabilities, emissions and costs needed by industrial and regional governmental planners in order to develop cost efficient air quality management strategies."

November 1996:  Frey Moderates Panel at Risk Conference.  See related story at Duke University.  See also Duke Law professor Jonathan Weiner’s paper on the topics discussed.




Portions of this web site are based upon work supported by the
National Science Foundation under Grant No. 9701502.

Any opinions, findings, and conclusions or recommendations expressed in this web site
are those of the author(s) and do not necessarily reflect the views of the
National Science Foundation.