CO2 is one of the few gases our body can detect. Because C02 build up in our lungs means we aren't performing respiration. I believe we can't detect C0 and th

CO2 is one of the few gases our body can detect. Because C02 build up in our lungs means we aren't performing respiration. I believe we can't detect C0 and things like N0 so they just straight up kill you once you pass out from oxygen deprivation