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Question

Which of the following is not regarded as a pollutant?

A
NO2
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B
CO2
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C
SO2
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D
CO
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Solution

The correct option is B CO2
Pollutants can be classified as solid, gaseous or liquid pollutants. Also, it can be classified as physical, chemical and biological. They can be further classified as degradable and non-degradable. NO2, SO2 and CO are gases which if present in great quantity in the atmosphere can cause pollution.

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