Why is carbon monoxide gas more harmful than carbon dioxide gas?
Carbon monoxide is much more dangerous than carbon dioxide because it combines with haemoglobin and forms a compound called carboxyhemoglobin. If the concentration of this increases in the blood up to 3-4%, the capacity of the blood to carry oxygen falls down. This gives rise to headaches, nervousness and in worse cases, the death of the person. As carbon dioxide does not combine with haemoglobin, it is less harmful than carbon monoxide.
