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    Question

    Which of the following is a primary

    pollutant?
    A Ozone (O₃) Correct Answer Incorrect Answer
    B Sulfuric acid (H₂SO₄) Correct Answer Incorrect Answer
    C Carbon monoxide (CO) Correct Answer Incorrect Answer
    D Peroxyacetyl nitrate (PAN) Correct Answer Incorrect Answer

    Solution

    A primary pollutant is emitted directly from a source. CO is released from vehicles and industries, whereas O₃, H₂SO₄, and PAN are secondary pollutants formed by chemical reactions in the atmosphere.

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