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    Question

    Which of the following are primary air pollutants? 

    (A) Ozone (O₃ ) (B) Sulfur dioxide (SO₂) (C) Peroxyacetyl nitrate (PAN) (D) Nitrogen dioxide (NO₂) (E) Particulate matter Choose the correct answer from the options given below:
    A (A) and (C) only Correct Answer Incorrect Answer
    B (B), (D), and (E) only Correct Answer Incorrect Answer
    C (C) and (E) only Correct Answer Incorrect Answer
    D (A), (C), and (E) only Correct Answer Incorrect Answer

    Solution

    Sulfur dioxide (SO₂), nitrogen dioxide (NO₂), and particulate matter are considered primary pollutants because they are emitted directly into the atmosphere from sources such as industrial processes and motor vehicles. Ozone (O₃ ) and peroxyacetyl nitrate (PAN) are secondary pollutants, formed by the reaction of primary pollutants in the atmosphere.

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