Description: Description: Description: Description: image005.jpg 



H. Christopher Frey


Distinguished University Professor

Description: Description: Description: Description: image001.jpg

Department of Civil,

Construction, and

Environmental Engineering


North Carolina State University
Raleigh, NC 27695-7908

Telephone: (919) 515-1155

Email:  frey (at)

Description: Description: Description: Description: image002.jpg

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]


Latest News:


·         June 2013.  Yuanfang Sun won the best M.S. thesis award from the Air & Waste Management Association (A&WMA) for her thesis “Repeatability of Real-World Vehicle Emissions Measurements.”  Karoline Johnson won first place for undergraduate student poster on “Real World Hybrid Electric Vehicle Fuel Use and Emissions,” presented at the Annual Meeting of the Air & Waste Management Association June 24-28 in Chicago, IL.  Graduate students Brandon Graver, Jianchuan Hu, Wan Jiao, Bin Liu, and Gurdas Sandhu received student travel awards from the Research Triangle Chapter and South Atlantic States Section of the A&WMA to attend and present papers at the annual meeting.

·         October 2012.  Dr. H. Christopher Frey, Distinguished University Professor of Civil, Construction and Environmental Engineering at North Carolina State University, has been appointed by US Environmental Protection Agency Administrator Lisa Jackson to chair the independently chartered Clean Air Scientific Advisory Committee (CASAC) for two years. Frey began his new role Oct. 1 (more information).

·         September 2012.  Dr. H. Christopher Frey Chris Frey has been approved to hold the title of Distinguished University Professor of Civil, Construction, and Environmental Engineering in recognition of outstanding accomplishments over his career.  The Distinguished University Professor title is limited to 4% of the total faculty by college.

·         Five recently published journal papers:

1.    Sandhu, G.S., and H.C. Frey, “Real-World Measurement and Evaluation of Heavy Duty Truck Duty Cycles, Fuels, and Emission Control Technologies,” Transportation Research Record, No. 2270, pp. 180-187.  DOI: 10.3141/2270-21.

2.    Jiao, W., H.C. Frey, and Y. Cao, “Assessment of Inter-Individual, Geographic, and Seasonal Variability in Estimated Human Exposure to Fine Particulate Matter.” Environmental Science and Technology, 46(22):12519-12526 (2012) DOI: 10.1021/es302803g

3.    Frey, H.C., H.W. Choi, and K. Kim, “Portable Emissions Measurement System for Emissions of Passenger Rail Locomotives,” Transportation Research Record, 2289:56-63 (2012).  DOI:  10.3141/2289-08

4.    Abolhasani, S., and H.C. Frey, “Variability in Construction Equipment Emissions by Equipment Type and Duty Cycle,” ASCE Journal of Environmental Engineering, 139(2):261-268 (February 2013).  DOI:  10.1061/(ASCE)EE.1943-7870.0000548

5.    Yazdani, B., H.C. Frey, and G.S. Sandhu, “In-Vehicle Road Grade Measurement Using Stand-Alone GPS with Barometric Altimeter,” ASCE Journal of Transportation Engineering, 139(6):605-611.  DOI: 10.1061/(ASCE)TE.1943-5436.0000545

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.