Which one of the following is not pollutant?

C O_{2}

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S O_{2}

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N O_{2}

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Solution

The correct option is D $C O_{2}$
The pollutant can be defined as a substance which pollutes the environment or adversely affect the resources. Carbon dioxide is a significant component of the atmosphere though present in small amount. It helps in several biological processes such as respiration, greenhouse effect( trapping the solar radiation to keep earth's surface warm). Carbon dioxide has many useful functions only when it is present in the naturally desired quantity in the atmosphere. The excess in the atmosphere than the usual quantity can cause serious problems to the environment and atmosphere.
Hence, the correct answer is 'CO $_{2}$ '

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