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Name the respiratory pigment present in human beings. Which major air pollutant has high affinity for this pigment?

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Haemoglobin is the respiratory pigment present in the human beings. It helps in the transportation of respiratory gases; mainly O2 & some amount of CO2 also. 

Carbon monoxide (CO) has a great affinity with haemoglobin. Increase in amount of CO in body can even cause the death of organism due to suffocation (insufficient blood supply).

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