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Question

Which one of the following is not normally a pollutant?


  1. Carbon monoxide

  2. Carbon dioxide

  3. Hydrocarbons

  4. Sulphur dioxide


Solution

The correct option is B

Carbon dioxide


The common gaseous pollutants are oxides of carbon (CO and CO2), oxides of nitrogen (NO and NO2) oxides of sulphur (SO2 and SO3), all these together contribute 90% of the global air pollution. Out of all these CO2 is not a pollutant normally, the green plants, by photosynthesis balance the CO2 and O2 ratios in the air to a great extent, whereas others like carbon monoxide, NO2 etc. are poisonous gases.

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