Multiple choice

Which of the following gases contribute(s) to ozone depletion?

  1. Carbon dioxide

  2. Nitrogen dioxide

  3. CFC

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorofluorocarbons (CFCs) release chlorine atoms when exposed to ultraviolet radiation in the stratosphere, which actively catalytically destroy ozone molecules. Carbon dioxide and nitrogen dioxide do not play the primary role in catalytic stratospheric ozone depletion in the manner CFCs do.

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