The Non-Exhaust Particulate Emissions Impact of EURO VI to Battery Electric Bus Fleet Transitions
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Abstract
There is already strong evidence that non-exhaust emissions (NEEs) are a significant source of
transport-related particulates, and an expectation that this will increase as we transition from
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conventional to heavier alternative technology vehicles. (1) Therefore, we need to ensure that our
existing commitment to zero (at tailpipe) emissions is complemented by an active effort to mitigate
any unintended consequences for NEEs. (2)
This work, led by FirstBus, and funded by the TRANSITION Clean Air Network funded by the Natural
Environment Research Council within the UKRI Clean Air Programme (3), uses the EURO VI-to-Battery
Electric Bus transition as a case study to explore options to: (a) improve inventorying information
available to fleet managers considering fleet upgrade options; and, (b) gather evidence on the
potential divergence between regulatory metrics, conventional emission factors, inventory model
predictions and the real-world outcomes as we migrate to what need to be significantly cleaner
technologies