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Consultants report big NOx and lifecycle GHG cuts for electric buses, flag propane data as contested
Summary
JLL showed large NOx reductions for electric and propane buses versus diesel and estimated about a 60% lifecycle greenhouse‑gas reduction for electric buses; presenters noted propane tailpipe and carbon monoxide figures are disputed by propane vendors and recommended deeper review.
JLL's presentation included two emissions analyses: tailpipe (local) emissions and well‑to‑wheel life‑cycle results. Gabriel Marti said the analysis shows dramatic reductions in NOx for electric buses and, on a life‑cycle basis, about a 60% reduction in greenhouse gas emissions for electric buses versus diesel under the consultants' assumptions.
"Switching to electric or propane will dramatically reduce nitrogen oxide emissions," Marti said, citing Argonne National Laboratory data used in the charts. He cautioned, however, that propane vendors challenged some of the carbon monoxide assumptions. "We talked about that to the propane vendor, and they said that they thought it was actually incorrect," Marti said, and the presenters called for further literature review and verification before drawing firm conclusions about some air‑quality measures.
The consultants also noted particulate matter in the modelling depends largely on tire wear and vehicle weight; heavier electric vehicles may show comparable PM2.5 generation over time despite lower tailpipe emissions. The work group asked for additional, locally validated emissions modelling before making policy recommendations.
