It is highly poisonous to living beings because of its ability to block the delivery of oxygen to the organs and tissues. It binds to haemoglobin of blood to form carboxyhaemoglobin (COHb) which is about 300 times more stable than oxy‐haemoglobin complex. In the blood when the concentration of carboxyhaemoglobin reaches about 3‐4 percent, the oxygen carrying capacity blood is greatly reduced. This oxygen deficiency, results in to headache, weak eyesight, nervousness and cardiovascular disorder CO2 does not combine with haemoglobin and hence is less harmful as pollutant but it is the main contributor forwards green house effect & global warming.
