Discussion
Carbon monoxide is emitted principally as a result of
Answer: C
Correct answer: Incomplete combustion
Carbon monoxide is the product of combustion that did not go to completion - insufficient oxygen, inadequate mixing, too short a residence time or too low a temperature leave carbon oxidised only as far as CO rather than \( \mathrm{CO_2} \).
Hence its sources: petrol engines under rich or transient operation, domestic solid fuel stoves, and open burning. Complete combustion produces carbon dioxide and no carbon monoxide, which is why good burner design and adequate excess air are the primary controls. It is a primary pollutant, not formed photochemically.
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