GURDAS S. SANDHU
Projects completed at U.S. EPA (2015 - 2020)

Related to the MOtor Vehicle Emission Simulator (MOVES, link) model, MOVES_CTI_NPRM version. The rates updates cover running exhaust CO2, THC, CO, NOx, and PM2.5 for MY 2010–2060, unless noted otherwise.
  • Late MY diesel heavy-duty vehicles (HDVs) – improved energy and emissions rates for MY 2016–2060; added 2 million seconds of the latest heavy-duty in-use testing (HDIUT) data from 74 HDVs to the previous dataset; proposed for inclusion in MOVES3, the next public release version of the model
  • Effect of intake humidity on NOx emissions – updated the equations and coefficients for all fuel and vehicle types and all model years; Proposed for inclusion in MOVES3
  • Diesel HDVs rates update – based on 8 million seconds of quality-assured HDIUT data from 291 vehicles; previous rates based on pre-DPF and pre-SCR vehicles; led to large increase in running exhaust NOx inventory; critical to establishing benefits from a rulemaking to reduce NOx emissions from HDVs
  • Gasoline HDVs rates update – analyzed current gasoline technology real-world in-use data; previous rates based on pre-2000 gasoline vehicles
  • Natural Gas(NG) HDVs rates update – analyzed current NG technology real-world in-use data; previous rates based on early 2000 model-year gasoline and NG vehicles
  • Glider HDVs – conducted analysis to establish that MY 2000 diesel HDV emission rates are representative of new glider vehicles
  • Revised the fixed mass factor (fscale) for all MY 2010–2060 HDVs – fundamental change in the MOVES model that improved its ability to distinguish between low-/medium-/high-load operation
  • CH4/THC ratio for MY 2010–2060 diesel HDVs – updated based on literature review; significant effect on pollutants, such as formaldehyde, chained to non-methane HCs
Assessment of HDV emissions regulation and technology; Cleaner Trucks Initiative (CTI, link)
  • Evaluated real-world emissions reduction from HD 2007/2010 standard and technologies such as SCR; led briefing to present findings to the Office Director of the Office of Transportation & Air Quality; analysis used in CTI’s Regulatory Impact Analysis of the Notice of Proposed Rulemaking (NPRM)
  • Led the development of the What-If Analysis Inventory Tool (WAIT) – takes user-defined HD gasoline, diesel, and CNG base emission rates, and useful life and warranty standards to produce national emissions inventory; significant time and effort savings compared to running the MOVES model; trained the CTI team on using WAIT to develop control cases for the NPRM
  • Developed estimates of emissions contribution from tampering & mal-maintenance and vehicle operation under idle, low-/medium-/high-load for baseline and control options; graphics used in the briefing to the EPA Administrator to select control options for the NPRM
  • Contributed to various rulemaking discussions and analysis related to certification standards, compliance methods, in-use testing, generation/use of credits, on-board diagnostics, benefit-cost, and air quality modeling

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  • Home
  • CV
  • Projects
    • U.S. EPA (2015 - 2020)
    • Graduate Research (2008-2014)
    • Industry (2001–2008)
  • Publications
    • Patents
    • Journal Articles
    • Presentations
    • Reports
  • Connect
  • Contact