A side street would see a few cars per minute. Compare that to a freeway where you are continuously surrounded by multiple cars doing high rpm.

I can imagine there is a non-trivial increase in certain gas concentrations, but smelling people's breath? That just seems ridiculous.

I'm going to guess English is not your first language. Breath is also a verb. Example: "I don't want to breath in all the exhaust fumes".

It sounds like you misunderstood my original comment.

Edit: welp sometimes you learn English as your first language for the second time and today is that day for me

> "Breath is also a verb."

I think the verb you're looking for is breathe. Breath is a noun.

I stand corrected. Thank you