You should be careful not to provide incorrect information. CO2 is NOT Carbon Monoxide. There's a reason why Carbon Monoxide (CO) is called the 'silent' killer. It is undetectable, which is why it accidentally kills thousands worldwide every year... Why are CO detectors needed if you can feel suffocatjng and panic?
Here's one source but I can provide you with hundreds more if you need...
http://cosafety.ca/#sourcesofcolist
What evidence do you have to support your claims of panic and suffocating being felt with Carbon Monoxide poisoning?