I can see EV buses being practical for future urban short distance pickup and drop off, but the longer haul rural routes, especially in cold climates, seem a long way off to the EV obsessed as a solution to anything. Huge subsidies and grants may seduce a few school boards but the reality is diesel loads replaced by EV are no where near ready for prime time.
What could immediately help the local pollution aspects of EV heavy vehicles is some sort of tire particulate collection device to stop spread. Tire pollution is a huge problem that is probably more important than where energy is obtained from near or far https://www.greencarcongress.com/2020/03/20200308-emissionsa...