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What is the main reason for ozone depletion?

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What is the main reason for ozone depletion?

(a) Releasing of oxygen

(b) Releasing of chemicals

(c) Releasing of CFCs

(d) Releasing of nitrogen

This question was addressed to me by my college professor while I was bunking the class.

This intriguing question originated from Effects and Control Measures of Air Pollution topic in portion Environmental Pollution of Energy Management

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Correct choice is (c) Releasing of CFCs

Explanation: Chlorofluorocarbons (CFCS) are extremely stable, non-flammable. CFCs leading in the ozone layer depletion. India signed the Montreal Protocol in 1992, which aimed at controlling the production and consumption of ozone depleting substances.

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