Which of the following is the most major constituents of air pollutants ?
Correct answer: A. Oxides of sulphur
- A. Oxides of sulphur
- B. Oxides of nitrogen
- C. Carbon monoxide
- D. Hydrogen sulphide
Explanation
Oxides of sulphur, especially sulphur dioxide, are conventionally treated as major air-pollutant constituents because they are emitted in significant amounts from coal and oil combustion and cause widespread acid and respiratory pollution. The wording is broad, but option a matches the usual textbook classification used by this question.
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