4 points
Ah okay, my understanding is that the new way is it literally needs to replace the oxygen in the garage with exhaust fumes so you suffocate instead of the nice “going to sleep” that CO caused. I didn’t know the science behind it though.
5 points
CO2 poisoning is very unpleasant while CO poisoning is unnoticed, as is oxygen depletion. That uncomfortable feeling you get when you hold your breath is due to the buildup of CO2, breathing in an atmosphere with too much CO2 for your body to get rid of what you’re producing would feel the same.