Which of the following is NOT a primary pollutant?
A. Nitrogen oxides
B. Carbon monoxide
C. Ozone
D. Sulfur dioxide
Answer: Option C
Solution (By JKExamLibrary)
Ozone is not a primary pollutant; it is a secondary pollutant. Primary pollutants are emitted directly into the atmosphere, such as carbon monoxide, sulfur dioxide, and nitrogen oxides.
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