Are the effects of air pollution worse at higher elevations?

Question

I know that air pollution tends to settles to the bottom, which is why places like Los Angeles are so polluted.

But my question is this: what if the SOURCE of the air pollution (i.e. car traffic) is AT the higher elevation. What happens then?

I am writing about the effects of tourism in the Himalaya mountains of India, and there is a mountain pass that is 13,500 feet high and is regularly clogged with traffic jams as 1000s of tourists ascend the pass every day. Somewhere I thought I heard that air pollution is actually more damaging the higher it occurs in the atmosphere (maybe this was talking about airplanes), so I would imagine that a 1000 cars spewing exhaust at 13,500 feet would be worse than 1000 cars spewing exhaust at 8000 or 1000 feet. Is this correct? Could you please explain some of the science behind this to me? Thanks!

Answer 1

i belive carbon emissions have a bigger effect on global warming at higher altitudes as it is being applied directly to the atmosphere as opposed to trickling up to it.

also pollution up high dosn't get the opportunity to be absorbed by plant life and soil bacteria.