The amount of pollution from individual private cars is nominal, but the amount of pollution from cars en masse (especially in concentrated road structures like highways) is substantial[1]. It becomes even more substantial when you mix in commercial car (read: diesel) traffic[2].
> If you live on an interstate, and don't want to, the best course of action is to move.
Sometimes you don't live on an interstate, but the interstate moves next to you anyways[1].
Other times, you live in a beautiful residential neighborhood (like I do), but 18-wheelers drive through your neighborhood and idle next to the public schools because there's no enforcement and it's convenient.
[1]: https://www.publichealth.columbia.edu/public-health-now/news...
[2]: https://theicct.org/wp-content/uploads/2022/04/true-diesel-t...