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Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition? 

(a) When inhaled into the human body CO is converted into CO

(b) The inhaled CO has much higher affinity for haemoglobin as compared to oxygen 

(c) The inhaled CO destroys the chemical structure of haemoglobin 

(d) The inhaled CO adversely affects the respiratory centre in the brain

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(b) Carbon Monoxide pollution occurs primarily from emissions produced by fossil fuel powered engines. The incomplete reaction of air with fuel produces the colourless, odourless and highly toxic gas. The main issue with Carbon Monoxide is its health effects. It is capable of binding to the chemicals in our blood, called haemoglobin. It does so far more effectively than oxygen and also stays bound to the haemoglobin for far longer than oxygen does. The effect is that the blood is starved of oxygen, which then affects the rest of the body.

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