Discussion
Principal constituents of atmospheric brown clouds are
I. Soot
II. Soil dust
III. Fly ash
IV. Sulphates and nitrates Identify the correct code :
Answer: D
All four constituents are principal constituents of atmospheric brown clouds, so the answer is (D). These clouds are layers of air pollution over large regions, such as South Asia, made of soot (black carbon), soil dust, fly ash and aerosols of sulphates and nitrates, together with other particles.
Each of the options (A), (B) and (C) lists only some of the constituents, so none is complete.
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