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
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.
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
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:
online May 16, 2016 (http://pubs.acs.org/doi/abs/10.1021/acs.est.6b01594)
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
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