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How many different types of primary pollutants together contribute to about 90 per cent of the global air pollution?

December 29, 2021
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How many different types of primary pollutants together contribute to about 90 per cent of the global air pollution?

Q. How many different types of primary pollutants together contribute to about 90 per cent of the global air pollution?

  1. Three
  2. Five
  3. Seven
  4. None of the above

Answer: (b) Five.

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