Discuss pollution caused by CO.
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What are different sources of CO pollution? What are the effects of continuous exposure to CO on human beings?

Explain giving reasons: There presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells.

Discuss measures for the control of CO pollution. 

Carbonmonoxide gas is more dangerous than carbondioxide. Why?

Discuss sources and sinks of CO₂ in the atmosphere.
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Discuss the role of CO₂ as a pollutant. 
Or
Carbon dioxide is inert and harmless gas, yet it is considered to be a serious pollutant. Explain. 

Discuss air pollution caused by oxides of nitrogen. 
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What are the principal environmental effects of NO₂?
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Name the oxide of nitrogen present in the atmosphere. What are the sources and sinks of NO_x?

Discuss measures for the control of NO_X pollution. 

How does SO₂ cause pollution?
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What are the principal environmental effects of SO₂?
Or
Describe sources, sinks and polluting effects of SO_2.

Discuss measures for the control of SO_x pollution.