I think ToW is thinking about CO2 (carbon dioxide), which is heavier than air. There are lots of stories about dry ice fumes pooling up and causing lack of oxygen.
CO is carbon monoxide and it comes from burning stuff. House furnaces and engine exhaust are the most common sources of CO danger. Being a weekend boat resident, we always hear the stories about boaters killed by CO. I keep my CO detector near my head since that's where I breath.
|