Which one is not a pollutant normally ?
Which one is not a pollutant normally ?
A. Hydrocarbons
B. Carbon dioxide
C. Carbon monoxide
D. Sulphur dioxide
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Correct Answer - B
`CO_(2)` is an essential component of the air and its concentration is 0.03% but when `CO_(2)` concentration goes above this limit, it acts as a pollutant.
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