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@The_Seldom_Killer
That's a good point, and certainly an area worth working on. If anything, it's much easier to do that than targetting private vehicles as we have much greater means of control over vehicles for commercial enterprises.
However, it's worth noting that from a pollution perspective, a bus running at even 30% capacity is putting out less pollution than if all the people on it, minus the driver, were to be driving around in private vehicles.
It's not the immediate experience of cycling behind a vehicle that should concern you the most but the cummulative effect that the full range of vehicles in an area has on air quality. The large particulate matter from exhausts that you can see, smell and even fell isn't damaging your respiratory systems nearly as much as the small particulate matter that you can't see and can't smell. And that's also the stuff that stays airborne a lot longer.