Van asked a nice question
But does a modern car put out enough pollutants to kill a person.
<I can't help myself>
Take a hose attached to tail pipe. Stick through window of car. Start car
and remain inside. Run until gas runs out. Count victims.
</I can't help myself>
It used to be said that the "Solution to pollution is diffusion" It was
true until the amount of pollution put into the air (water, land, etc)
exceeded the "carrying capacity" of the system.