A list of air pollutants is given below:

Q. A list of air pollutants is given below:

i. Sulphur dioxide

ii. Carbon monoxide

iii. Radioactive substances

iv. Sulphuric acid

Which of these are ‘primary’ pollutants?

  1. i and ii only
  2. i, ii and iii only
  3. iii and iv only
  4. i and iv only

Answer: i, ii and iii only

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