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Which of the following is the example of primary pollutants?

63. Which of the following is the example of primary pollutants?

  1. Carbon monoxide
  2. Oxides of sulphur
  3. Hydrocarbons
  4. All of the above

Answer: D) All of the above

Explanation:

Primary pollutants include, Carbon monoxide, Oxides of sulphur, Hydrocarbons, hydrogen cyanide, etc.

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