If it is common knowledge that shutting a garage door with a running ICE vehicle inside will kill you, why do you think so many people think 1 billion ICE vehicles aren't bad in the atmosphere?
"But tires"
Ban all vehicles over 5000lbs to start without a specialized license and extremely heavy fees to have them. EVs are dropping in weight daily, ICE vehicles have been increasing in weight to dodge policies. One is a means to an end, the other is a means to profit.
Profit for few vs humanity's existance.. which should we choose?
I'm not here to diss EVs or praise ICE vehicles, but I want to simply directly answer your question. There's one simple mantra that is applicable to a lot of things in life...the dose makes the poison. Not odd to see people extrapolate to that your scenario.
In one, although the quantity is greater, you're "diluting" the gas into the humongous atmosphere. In the other, you're taking the gas straight up undiluted.