Is there any good reason why buses & any other large diesel do not have there exhaust fumes emitting from high level as opposed to their current method of coming out at ground level. When i'm in a town centre sometimes surrounded by buses the amount of exhaust fumes i inhale can't be doing me or any one else any good. Surely if the fumes were emitted from the top of the vehicle (particularly double decker buses) it would give the fumes time to dissipate before getting down to pedestrian level.
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