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Question

Which is normally not an air pollutant?

A
CO
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B
SO2
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C
Hydrocarbons
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D
CO2
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Solution

The correct option is D CO2
A pollutant is a chemical substance, which is harmful to living systems, like sulphur dioxide or carbon monoxide or benzene. CO2 is a natural substance, expelled by animals and plants, and absorbed by photosynthetic plants during their respiratory cycle. It is not toxic. Hence, it cannot be considered as a pollutant.

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