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GATE ES 2021 | Question: 37

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In air pollution, which of the following is/are classified as primary pollutants?

  1. Carbon monoxide $(\mathrm{CO})$
  2. Sulphur dioxide $\left(\mathrm{SO}_{2}\right)$
  3. Ozone $\left(\mathrm{O}_{3}\right)$
  4. Nitrogen dioxide $\left(\mathrm{NO}_{2}\right)$

     

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