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H. Christopher Frey


Glenn E. Futrell Distinguished University Professor

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Department of Civil,

Construction, and

Environmental Engineering


North Carolina State University
Raleigh, NC 27695-7908

Telephone: (919) 515-1155

Email:  frey (at)

Research Interests



Current and Recent Projects

Past Projects

Computer Laboratory

Frey Research Group

Professional Activities

Real-World Vehicle Emissions

My interests are broadly in energy and environmental systems, including:  modeling and evaluation of advanced energy conversion (e.g.,combustion, gasification) and environmental control systems; measurement and modeling of real-world fuel use and emissions of onroad and nonroad vehicles; development and application of methods for quantification of variability and uncertainty and for sensitivity analysis in systems models; and exposure and risk analysis.  Air pollutant emissions of interest include criteria pollutants, hazardous air pollutants (“air toxics”), particulate matter, and greenhouse gases.  More details on my teaching, current and past research activities, publications, professional advisory activities, research group, and computer laboratory are available in the links above.  [link to CCEE department webpage for Dr. Frey]


Follow Dr. Frey on LinkedIn, ResearchGate, ORCID, Scopus, and Google Scholar.


Latest News:


·         In this 3-minute video, Professor Frey talks about an emerging field of science that will allow people and communities to reduce their air pollution risks. “Exposure Science” studies human contact with air pollution through measuring the concentration of air pollutants and how long, and where, we are in contact with them.  Also learn about the “PRAISE-HK” project in which Dr. Frey is working with colleagues in Hong Kong to develop a personalized exposure assessment system.

·         Dr. H. Christopher Frey, the Glenn E Futrell Distinguished University Professor in CCEE, continues to collaborate on air quality research and education with several Ph.D. students whom he has advised. Most recently this was evidenced at the Fifth International Symposium on Regional Air Quality Management in Rapidly Developing Economic Regions, (5RAQM) held in Guangzhou, China in November.  Learn more…

·         Dr. Frey was recognized by Environmental Science and Technology with an “Excellence in Review Award” in recognition of going "the extra distance to write reviews that were truly exceptions."  Only 18 awards were given internationally, of which only 7 in the U.S. were selected, based on about 10,000 reviews submitted to ES&T in the past year (  November 2017

·         Dr. Chris Frey presented findings from his emissions research on June 12, 2017 as part of the U.S. Environmental Protection Agency’s (EPA) Science to Achieve Results (STAR) Webinar Series. The webinar series is titled “Emissions Research to Improve Decision-making”

·         Five recently published journal papers:       

1.    Khan, T., and H.C. Frey, “Comparison of real-world and certification emission rates for light duty gasoline vehicles,” Science of the Total Environment,             622–623: 790–800 (May 2018). (free access)

2.    Li, Z., W. Che, H.C. Frey, A.K.H. Lau, “Factors Affecting Variability in PM2.5 Exposure Concentrations in a Metro System,” Environmental Research, 160C:20-26 (2017). (free access until 11/10/17)

3.    Frey, H.C., M. Delavarrafiee, and S. Singh, “Real-World Freeway and Ramp Activity and Emissions for Light Duty Gasoline Vehicles,” Transportation Research Record, 2627:17-25 (2017).

4.    Li, Z., W. Che, H.C. Frey, A.K.H. Lau, “Characterization of PM2.5 Exposure Concentration in Transport Microenvironments Using Portable Air Monitors,” Environmental Pollution, 228:433-442 (2017).

5.    Graver, B.M., H.C. Frey, and J. Hu, “Effect of Biofuels on Real-World Emissions of Passenger Locomotives,” Environmental Science and Technology, 50(21):12030-12039, DOI:  10.1021/acs.est.6b03567, October 3, 2016. (

More publications

News Archive




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.