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UPSC Prelims 2025GS1GeographyAtmospheric Dust Particles

Q46. Consider the following statements:
Statement I: The amount of dust particles in the atmosphere is more in subtropical and temperate areas than in equatorial and polar regions.
Statement II: Subtropical and temperate areas have less dry winds.

Which one of the following is correct in respect of the above statements?

A. Both Statement I and Statement II are correct and Statement II explains Statement I
B. Both Statement I and Statement II are correct but Statement II does not explain Statement I
C. Statement I is correct but Statement II is not correct✓ Correct
D. Statement I is not correct but Statement II is correct

Detailed Solution

✓ Correct Answer: Option C
✓ Statement I is correct
Dust particles are generally more concentrated in subtropical and temperate regions compared to equatorial and polar areas. This is due to several factors, including the presence of large desert areas in subtropical zones, which are major sources of dust, and the atmospheric circulation patterns that transport dust. Polar regions have less exposed land and lower temperatures, limiting dust generation, while equatorial regions experience frequent rainfall that washes dust out of the atmosphere.
✗ Statement II is incorrect
Subtropical and temperate areas often experience significant dry winds, such as trade winds and westerlies, which can pick up and transport dust from arid and semi-arid regions. The presence of dry winds actually contributes to higher dust concentrations, rather than indicating less dry winds. Therefore, Statement I is correct, but Statement II is incorrect. Understanding atmospheric composition and dynamics is a core topic in UPSC Geography.
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