co2 is carbon monoxide
carbon dioxide and carbon monoxide carbon dioxide co2 and carbon monoxide co are sometimes confused they are quite different in their effects on humans carbon dioxide co2 is present in the atmosphere today at 385 parts per million by volume or 0 039 percentarbon monoxide co unlike co2 is a bad poison co is produced by incomplete combustion i e when there isn t enough oxygen to make co2 you get co carbon monoxide binds very strongly to the iron in the hemoglobin in the blood once carbon monoxide attaches it is very difficult to release