Which of these gases is not considered as a pollutant?

Carbon dioxide

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Oxygen

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Chlorofluorocarbons

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Nitrogen dioxide

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Solution

The correct option is B Oxygen
Carbon dioxide, carbon monoxide, sulphur dioxide, nitrogen oxides, chlorofluorocarbons (CFCs) etc causes air pollution. Hence they are considered as air pollutants.

Whereas oxygen helps for the survival of life, so it is not a pollutant.

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