Class 4 (4th Engineer) SSEP 📅 Jan 2026

Exam Question

(a) What is ozone depletion and what are it's effects.? (5)

(b) Name the gases which have ozone depleting potential and how ODP is classified. (5)

(c) What actions are now in place to control the usage or accidental release of such gases. What recordkeeping is essential? (10)

Reference Answer

### (a) Ozone Depletion and its Effects (5 Marks)
**1. Concept of Ozone Depletion:**
Ozone (O₃) is a gas that forms a protective layer in the stratosphere, approximately 15 to 30 kilometers above the Earth's surface. This layer is crucial for controlling the planet's climate and shielding life from harmful ultraviolet (UV) radiation from the sun.
Ozone depletion is the process of the thinning and breakdown of this stratospheric ozone layer. The mechanism is a catalytic chemical cycle initiated by man-made pollutants, primarily those containing chlorine and bromine atoms.

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