I think it is shielded somewhat, at least the more modern versions. I had this concern too and feel nauseous with vertigo in my friend's Tesla and some hybrids. But this is n=1 and I also feel dizzy in normal cars.
It turns out most cars have high EMF, not just from connectivity/wifi, but also from their alternator.
View: https://www.youtube.com/watch?v=YQ2Xs3CHMg0&ab_channel=WholeHomeandBodyHealth
I've seen youtube videos of people measuring EMF (theres so many different types so personally I don't think they are ever able to get the full story)
I've been around all kinds of gas cars, I know all cars have batteries, etc but EMF never bothered me unless it was a hybrid or a Tesla
Even when a Tesla is 'OFF' and across the street (20+ ft distance) The EMF really bothers me and I've never had that happen to me with any other car
But yea I think driving is pretty stressful in general (99% of seats and seat belts are toxic estrogenic material, sitting is stressful in general) but inhaling the fumes from a gas car is nowhere near as damaging as the EMF I have suffered from a Tesla in my opinion
And the worst thing is it never goes off, so if you have a Tesla in your driveway you are suffering 24/7 damage