1. Particulate matter
  2. Carbon monoxide
  3. Sulpuric acid
  4. Nitrogen oxides
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1 Answers

Answer: Option 3

Ozone is not a primary pollutant since it is formed by the photo-chemical reaction of oxygen with the UV rays and not directly discharged into the atmosphere by a source. Similarly, sulphuric acid is also not a primary pollutant.

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