| Effects of errors on vehicle emission rates from portable emissions measurement systems GS Sandhu, HC Frey Transportation research record 2340 (1), 10-19, 2013 | 76 | 2013 |
| Road grade measurement using in-vehicle, stand-alone GPS with barometric altimeter BY Boroujeni, HC Frey, GS Sandhu Journal of Transportation Engineering 139 (6), 605-611, 2013 | 51 | 2013 |
| In-use activity, fuel use, and emissions of heavy-duty diesel roll-off refuse trucks GS Sandhu, HC Frey, S Bartelt-Hunt, E Jones Journal of the Air & Waste Management Association 65 (3), 306-323, 2015 | 40 | 2015 |
| Real-world activity, fuel use, and emissions of diesel side-loader refuse trucks GS Sandhu, HC Frey, S Bartelt-Hunt, E Jones Atmospheric Environment 129, 98-104, 2016 | 37 | 2016 |
| In-use measurement of the activity, fuel use, and emissions of front-loader refuse trucks GS Sandhu, HC Frey, S Bartelt-Hunt, E Jones Atmospheric Environment 92, 557-565, 2014 | 35 | 2014 |
| Real-world activity, fuel use, and emissions of heavy-duty compressed natural gas refuse trucks GS Sandhu, HC Frey, S Bartelt-Hunt, E Jones Science of The Total Environment 761, 143323, 2021 | 22 | 2021 |
| Real-world measurement and evaluation of duty cycles, fuels, and emission control technologies of heavy-duty trucks GS Sandhu, HC Frey Transportation research record 2270 (1), 180-187, 2012 | 21 | 2012 |
| Field Measurements of 1996 to 2013 Model Year Light Duty Gasoline Vehicles BMG H. Christopher Frey, Behdad Yazdani-Boroujeni, Jiangchaun Hu, Gurdas S ... Proceedings, 106th Annual Conference, Air & Waste Management Association …, 2013 | 18 | 2013 |
| Real-world activity and fuel use of diesel and cng refuse trucks G Sandhu, HC Frey, S Bartelt-Hunt, E Jones PEMS International Conference & Workshop, 2014 | 10 | 2014 |
| In-vehicle road grade measurement using stand-alone GPS with barometric altimeter B Yazdani, HC Frey, GS Sandhu ASCE Journal of Transportation Engineering, 2013 | 8 | 2013 |
| Method for modeling driving cycles, fuel use, and emissions for over snow vehicles J Hu, HC Frey, GS Sandhu, BM Graver, GA Bishop, BG Schuchmann, ... Environmental science & technology 48 (14), 8258-8265, 2014 | 7 | 2014 |
| Incorporating vehicle portable emissions measurement systems into the classroom HC Frey, GS Sandhu, Y Sun, T Lee, H Swidan, B Liu, S Babaee Proceedings of the Annual Meeting of the Air & Waste Management Association, 2011 | 6 | 2011 |
| Particulate calibration and generation simulator for particle measurement and number K Ropkins, D Miller, JW Hynd, J Miller, C Pfister, A Burnette, G Sandhu US Patent 10,656,061, 2020 | 4 | 2020 |
| Particulate matter/number synchronization measurement device DW Miller, JW Hynd, GS Sandhu, AD Burnette, K Ropkins US Patent 10,190,945, 2019 | 4 | 2019 |
| Methods for Quality Assurance of Portable Emissions Measurement System Data and Methods for Field Comparison of Alternative Fuels. G Sandhu | 3 | 2011 |
| Updates to MOVES Heavy Duty Running Exhaust Rates: Diesel, Gasoline, and Natural Gas GS Sandhu, D Sonntag | 2 | 2019 |
| In-Use Emission Rates for MY 2010+ Heavy-Duty Diesel Vehicles GS Sandhu, D Sonntag, J Sanchez CRC On-Road Vehicle Emissions Workshop, Long Beach, CA, 2017 | 2 | 2017 |
| Investigating the Incorporation of Idle, High Idle, and Driving Acceleration NOx Emissions Tests into the Periodic Technical Inspection Procedures D Thomas, GS Sandhu, T Nilsson, S Bjurkvist Atmosphere 14 (3), 536, 2023 | | 2023 |
| Device and method for measuring emissions with a linear arrangement of sensors DW Miller, JW Hynd, GS Sandhu, AD Burnette, K Ropkins US Patent 11,579,045, 2023 | | 2023 |
| Particulate calibration and generation simulator for particle measurement and number K Ropkins, D Miller, JW Hynd, J Miller, C Pfister, A Burnette, G Sandhu US Patent App. 17/483,476, 2022 | | 2022 |
H. Christopher FreyGlenn E. Futrell Distinguished University Professor of Environmental Engineering, North CarolinaVerified email at ncsu.edu
