[Finaddict]

I am reaching out to those of you who are knowledgable about cars - mechanics, etc. While my car is at idle at a traffic light or parking spot, it seems like I am getting the smell of the exhaust in my car, but I am not seeing the exhaust ... it just started over the weekend - I just roll down my window but have to believe it's not healthy if I am smelling that.

Do you think it could be a whole in the muffler (there's no extra noise though)? Which I have to believe wouldn't make that much of a difference in the interior of my car.

Or maybe it could be oil burning on the engine, maybe there's a leak there? Is either of the two more likely?
Appreciate any insight you guys may have.

Thanks