Discussion
Assertion (A): Air pollution episodes are often associated with a temperature inversion.
Reason (R): The inversion is a stable layer that prevents pollutants from mixing upwards.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Under an inversion the air beneath is trapped: convection cannot lift pollutants through the warmer layer above, so emissions accumulate in a shallow depth instead of dispersing through the troposphere. The classic severe episodes - London in 1952, Los Angeles, the Po valley in winter - all occurred under persistent inversions.
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