What size co2 tank if opened in a honda accord 2012 would be enough to kill you? And where can i get one?

What size co2 tank if opened in a honda accord 2012 would be enough to kill you? And where can i get one?

You'd need a lot. For one, cars aren't airtight so it would leak out quickly. For two, there isn't very much CO2 in the air so it would take a bit to reach levels high enough for asphyxiation. CO (carbon monoxide) kills more quickly because it actually replaces oxygen in the blood. It also has the added effect of making your corpse turn a bright red color.