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: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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