Nitrous oxides and CFC's both have a damaging effect on:

Nitrous oxides and chlorofluorocarbons (CFCs) are both significant contributors to the depletion of the ozone layer. The ozone layer, located in the stratosphere, plays a crucial role in protecting Earth from harmful ultraviolet (UV) radiation. CFCs, used in refrigeration, air conditioning, and aerosol propellants, release chlorine atoms upon breakdown in the stratosphere, which can catalyze the destruction of ozone molecules. Similarly, nitrous oxide, while primarily known for its greenhouse gas effects, also contributes to ozone depletion.

This option is highlighted because both compounds interact with and damage the ozone layer specifically, leading to the thinning of this crucial protective barrier. Understanding the impact of these substances on the ozone layer is vital for grasping the broader implications for environmental health and the measures taken to mitigate their effects, such as the implementation of the Montreal Protocol.