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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:


·         Dr. Frey recently gave a seminar on “Denying Denialism:  Uncovering the Methods and Institutions of Climate Change Denial  The abstract, slides, and video for this seminar are available.

·         The Transportation and Air Quality Committee (ADC20) of the Transportation Research Board selected a paper authored by Dr. H. Christopher Frey and graduate students Maryam Delavarrafiee and Sanjam Singh as its "Spotlight Presentation" for the 2017 TRB Annual Meeting.  The paper, "Real-World Freeway and Ramp Activity and Emissions for Light Duty Gasoline Vehicles," was ranked 1st among 110 papers reviewed by ADC20 for the Annual Meeting.

·         Dr. H. Christopher Frey who is a member of the Board of Directors of the Air & Waste Management Association (A&WMA), was elected in November 2016 as a 2017 Vice President of the A&WMA.  He will join the A&WMA Executive Committee in addition to continuing to serve on the board.

·         Five recently published journal papers:

1.    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. (

2.    Graver, B.M., and H.C. Frey, “Highway Vehicle Emissions Avoided by Diesel Passenger Rail Service Based on Real-World Data,” Urban Rail Transit, Accepted 9/30/16. (Open Access:

3.    Che, W., H.C. Frey, and A.K.H. Lau, “Sequential Measurement of Intermodal Variability in Public Transportation PM2.5 and CO Exposure Concentrations,” Environmental Science and Technology, 50(16):8760-8769 (2016)  DOI: 10.1021/acs.est.6b01594.  Published online May 16, 2016 (

4.    Khan, T., and H.C. Frey, “Evaluation of Light Duty Gasoline Vehicle Rated Fuel Economy Based on In-Use Measurements,” Transportation Research Record, 2570:21-29 (2016).

5.    Sandhu, G.S., H.C. Frey, S. Bartelt-Hunt, and E. Jones, “Real-World Activity, Fuel Use, and Emissions of Diesel Side-Loader Refuse Trucks,” Atmospheric Environment, 129:98-104 (March 2016).  doi:10.1016/j.atmosenv.2016.01.014

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.