Hello All.

I have seen a couple stories recently where people have been found either dead or unconscious in vehicles with no clear explanation as to what may have happened.

https://punchng.com/man-woman-found-dead-in-car-in-lagos/

https://www.pulse.ng/gist/driver-and-two-passengers-found-unconscious-with-their-eyes-wide-open/xqm1nbd

Now, one possible explanation frequently put forward is that some kind of Carbon monoxide or dioxide poisoning may have taken place in one of these three ways:

1. Leakage from the exhaust into the vents via the AC
2. Leakage of refrigerant
3. Infiltration of carbon monoxide from other vehicles through the vents and distributed via the AC.

I have done some investigation and spoken to my own mechanic and he assured me that the first option is not possible as there is no way a leakage from the exhaust can lead to infiltration through the AC system.

Some internet research also shows that refrigerant leakage is possible but is highly unlikely to lead to any form of damage as refrigerant gas is not harmful itself.

Finally the third option seems theoretically possible but given the condition of traffic on our roads, such cases should be much more common if it were a genuinely possible cause.

So guys, what do you think?

Expert opinions will especially be appreciated, along with any anecdotal evidence (examples/stories you heard).

Autojosh can you weigh in?

Reference can you weigh in? I observed you made a length comment on this topic on a different post.

SmartyPants:
Reference can you weigh in? I observed you made a length comment on this topic on a different post.

my progress so far