H. Christopher Frey

Overview

Best Publications

• Probabilistic Techniques in Exposure Assessment: A Handbook for Dealing with Variability and Uncertainty in Models and Inputs

  Alison C. Cullen;H. Christopher Frey

  1348
  Citations

• Identification and Review of Sensitivity Analysis Methods

  H. Christopher Frey;Sumeet R. Patil

  1260
  Citations

• On-Road Measurement of Vehicle Tailpipe Emissions Using a Portable Instrument

  H. Christopher Frey;Alper Unal;Nagui M. Rouphail;James D. Colyar

  365
  Citations

• Fuel use and emissions comparisons for alternative routes, time of day, road grade, and vehicles based on in-use measurements.

  H. Christopher Frey;Kaishan Zhang;Nagui M. Rouphail

  300
  Citations

• Uncertainties in predicted ozone concentrations due to input uncertainties for the UAM-V photochemical grid model applied to the July 1995 OTAG domain

  Steven R Hanna;Zhigang Lu;H Christopher Frey;Neil Wheeler

  278
  Citations

• A Vehicle-Specific Power Approach to Speed- and Facility-Specific Emissions Estimates for Diesel Transit Buses

  Haibo Zhai;H. Christopher Frey;Nagui M. Rouphail

  262
  Citations

• Comparing real-world fuel consumption for diesel- and hydrogen-fueled transit buses and implication for emissions

  H. Christopher Frey;Nagui M. Rouphail;Haibo Zhai;Tiago L. Farias

  233
  Citations

• A review of factors impacting exposure to PM2.5, ultrafine particles and black carbon in Asian transport microenvironments

  Prashant Kumar;Prashant Kumar;Allison P. Patton;John L. Durant;H. Christopher Frey

  176
  Citations

• Real-World In-Use Activity, Fuel Use, and Emissions for Nonroad Construction Vehicles: A Case Study for Excavators

  Saeed Abolhasani;H. Christopher Frey;Kangwook Kim;William Rasdorf

  174
  Citations

• Comprehensive Field Study of Fuel Use and Emissions of Nonroad Diesel Construction Equipment

  H. Christopher Frey;William Rasdorf;Phil Lewis

  165
  Citations

• Coal blending optimization under uncertainty

  Jhih-Shyang Shih;H.Christopher Frey

  161
  Citations

• Road grade estimation for on-road vehicle emissions modeling using light detection and ranging data.

  Kaishan Zhang;H. Christopher Frey

  153
  Citations

• Assessing methods for comparing emissions from gasoline and diesel light-duty vehicles based on microscale measurements

  Margarida C. Coelho;H. Christopher Frey;Nagui M. Rouphail;Haibo Zhai

  152
  Citations

• Quantitative Analysis of Uncertainty and Variability in Environmental Policy Making

  H. Christopher Frey

  151
  Citations

• Road grade quantification based on global positioning system data obtained from real-world vehicle fuel use and emissions measurements

  Behdad Yazdani Boroujeni;H. Christopher Frey

  145
  Citations

• Characterizing, simulating, and analyzing variability and uncertainty: An illustration of methods using an air toxics emissions example

  H. Christopher Frey;David S. Rhodes

  145
  Citations

• Methods for Characterizing Variability and Uncertainty : Comparison of Bootstrap Simulation and Likelihood-Based Approaches

  H. Christopher Frey;David E. Burmaster

  135
  Citations

• Speed- and Facility-Specific Emission Estimates for On-Road Light-Duty Vehicles on the Basis of Real-World Speed Profiles

  H Christopher Frey;Nagui M Rouphail;Haibo Zhai

  131
  Citations

• Evaluation of numerical models for simulation of real-world hot-stabilized fuel consumption and emissions of gasoline light-duty vehicles

  C.M. Silva;T.L. Farias;H. Christopher Frey;Nagui M. Rouphail

  126
  Citations

• Trends in onroad transportation energy and emissions.

  H. Christopher Frey

  119
  Citations

• Requirements and Incentives for Reducing Construction Vehicle Emissions and Comparison of Nonroad Diesel Engine Emissions Data Sources

  Phil Lewis;William J Rasdorf;H Christopher Frey;Shih-hao Pang

  111
  Citations