I agree most gas powered vehicles are basically odorless and have low impact on the air that is noticeable to a human.

However, even a single diesel vehicle can make the air in a half-block radius harder to breathe for minutes after it passes, even relatively recent ones. It is really shocking to me that such vehicles are legal, even if only by grandfathering in. Maybe I'm uniquely sensitive to them or something.

Even worse, companies actively seek them out because they are super reliable and will run for up to a million miles or more. In principle you are not allowed to make any more but there are companies selling "glider kits" that are basically an engineless truck that you can drop your old engine into.

Ancient diesels or newer “deleted” diesels - all floored for maximum exhaust it seems. Also just other big vehicles. Garbage trucks, delivery trucks, etc.

But even the fumes from my hybrid are a noticeable bummer if I’m out of the vehicle.

I can tell you didn't grow up during the 70's, with leaded gas and carburetors that dumped raw fuel out the tailpipe. In comparison, today's cars emit practically nothing but water. (there's room for improvement of course - but I see that as being an EV once they get to a half-day's driving range)

Those are definitely still driving around here, though rarer.