Chris Frey

Glenn E. Futrell Distinguished University Professor

  • 919-515-1155
  • Fitts-Woolard Hall 3201

Dr. Frey is the Glenn E. and Phyllis J. Futrell Distinguished University Professor at North Carolina State University. His research includes measurement and modeling of human exposure to air pollution, measurement and modeling of vehicle emissions, probabilistic and sensitivity analysis methods, and probabilistic assessment of power generation environmental technologies. He has led over 70 research studies, published over 140 peer reviewed journal papers, and delivered over 180 invited talks nationally and internationally. He teaches courses on air pollution control, environmental exposure and risk assessment, and sustainable infrastructure.

Dr. Frey has worked extensively with the U.S. Environmental Protection Agency. His was a AAAS/EPA Environmental Science and Engineering Fellow at ORD’s National Center for Environmental Assessment in 1992 and served a one year IPA assignment as exposure modeling advisor in the National Exposure Research Laboratory from 2006 to 2007. He was a member of the EPA FIFRA Scientific Advisory Panel (2004 to 2006), a member of the EPA Clean Air Scientific Advisory Committee (CASAC) (2008 to 2012), chair of CASAC (2012 to 2015), and a member of the EPA Science Advisory Board (2012 to 2018). He chaired CASAC reviews of lead, nitrogen dioxide, and ozone, and has served on CASAC review panels for all criteria pollutants regulated under the National Ambient Air Quality Standards. He was a member of the CASAC Particulate Matter Review Panel that was dismissed in 2018: under his leadership, the panel reconvened as the Independent Particulate Matter Review Panel.

Dr. Frey has had numerous other science advising and expert roles, including serving on National Research Council (NRC) committees, on the NRC Board of Environmental Studies and Toxicology, on a World Health Organization (WHO) working group on uncertainty in exposure assessment, as a contributor to the U.S. Department of Transportation report to Congress on Transportation’s Role in Reducing U.S. Greenhouse Gas Emissions, as a contributor to NARSTO reports on emission inventories and air quality management, and as an expert and lead author on uncertainty for the Intergovernmental Panel on Climate Change (IPCC) Guidelines on National Greenhouse Gas Emissions. He is a member of the Transportation and Air Quality Committee (ADC20) of the Transportation Research Board and the Publications and Critical Review committees of the Air & Waste Management Association. In 2018, he wrote and delivered the 48th Annual A&WMA Critical Review on “Trends in Onroad Transportation Energy and Emissions.”

Dr. Frey is a Fellow of the Air & Waste Management Association (A&WMA) and of the Society for Risk Analysis (SRA), served on the A&WMA Board of Directors (2015-2018), and was President of SRA in 2006. He received the Chauncey Starr Award from SRA in 1999, the Lyman A. Ripperton Award from A&WMA in 2012, and the Frank A. Chambers Award from A&WMA in 2019. He has a B.S. in mechanical engineering from the University of Virginia, a master of engineering in mechanical engineering from Carnegie Mellon University, and Ph.D. in engineering and public policy from Carnegie Mellon.


Ph.D. 1991

Engineering and Public Policy

Carnegie Mellon University

M.S. 1987

Mechanical Engineering

Carnegie Mellon University

B.S. 1985

Mechanical Engineering

University of Virginia

Research Description

Dr. Frey is interested in air pollution emissions, prevention and control; measurement and modeling of activity, energy use, and emissions of on-road and non-road vehicles; exposure and risk analysis; quantification of variability and uncertainty; modeling and evaluation of energy conversion and emission control technologies.

Honors and Awards

  • Alcoa Foundation Distinguished Engineering Research Award, 2020
  • Frank A. Chambers Excellence in Air Pollution Control Award from the Air & Waste Management Association, 2019
  • Excellence in Review Award from Environmental Science & Technology, 2017
  • Lyman A. Ripperton Environmental Educator Award from the Air & Waste Management Association, 2012
  • Fellow, Air & Waste Management Association, 2008
  • NCSU Alumni Association Outstanding Research Award, 2008
  • Fellow, Society for Risk Analysis, 2006
  • Chauncey Starr Award, Society for Risk Analysis, in recognition of exceptional contributions to the field of Risk Analysis, 1999


Characterizing Fuel Use and Emission Hotspots for a Diesel-Operated Passenger Rail Service
Rastogi, N., & Frey, H. C. (2021), ENVIRONMENTAL SCIENCE & TECHNOLOGY, 7.
Combined effects of increased O-3 and reduced NO2 concentrations on short-term air pollution health risks in Hong Kong
Hossain, M. S., Frey, H. C., Louie, P. K. K., & Lau, A. K. H. (2021), ENVIRONMENTAL POLLUTION, 270.
Factors affecting variability in infiltration of ambient particle and gaseous pollutants into home at urban environment
Hossain, M. S., Che, W., Frey, H. C., & Lau, A. K. H. (2021), BUILDING AND ENVIRONMENT, 206, 108351.
Multi-scale evaluation of diesel commuter rail fuel use, emissions, and eco-driving
Real-world activity, fuel use, and emissions of heavy-duty compressed natural gas refuse trucks
Sandhu, G. S., Frey, H. C., Bartelt-Hunt, S., & Jones, E. (2021), SCIENCE OF THE TOTAL ENVIRONMENT, 761.
Sensitivity of light duty vehicle tailpipe emission rates from simplified portable emission measurement systems to variation in engine volumetric efficiency
Wei, T., & Frey, H. C. (2021, June 10), JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION, Vol. 6, pp. 1–21.
Evaluation of the Precision and Accuracy of Cycle-Average Light Duty Gasoline Vehicles Tailpipe Emission Rates Predicted by Modal Models
Factors affecting variability in fossil-fueled transit bus emission rates
Wei, T., & Frey, H. C. (2020), ATMOSPHERIC ENVIRONMENT, 233.
Geospatial Variation of Real-World Tailpipe Emission Rates for Light-Duty Gasoline Vehicles
Khan, T., Frey, H. C., Rastogi, N., & Wei, T. (2020), Environmental Science & Technology, 54(14), 8968–8979.
PRAISE -HK: A personalized real-time air quality informatics system for citizen participation in exposure and health risk management
Che, W., Frey, H. C., Fung, J. C. H., Ning, Z., Qu, H., Lo, H. K., … Lau, A. K. H. (2020), SUSTAINABLE CITIES AND SOCIETY, 54.

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