It would logically have to end up on the ground. If it gets into the water would have to do with solubility, and most combustion products aren’t very soluble, so you’re probably not drinking too much smog.
I don’t actually know where they ultimately end up and to what degree they can make you sick except through inhalation. Somebody has to have studied it, though, right?
Ah, interesting. I should hope not all pollutants dissolve into water, but I wonder: wouldn’t they still be bad when ingested even if not dissolved into water?