The Ozone Layer and Hole

The video explains that over 90% of Earth's ozone is in the stratosphere, forming a protective layer that absorbs harmful UVB rays. In the 1980s, scientists discovered significant ozone depletion over Antarctica and the Arctic, linked to chlorofluorocarbons (CFCs). These stable industrial chemicals release chlorine when exposed to UV light, which then breaks down ozone. The Montreal Protocol was established to phase out CFCs, aiming for ozone recovery by 2050.

What percentage of the Earth's ozone exists in the lower reaches of the stratosphere?

What is the role of the ozone layer in relation to ultraviolet-B rays from the Sun?

What industrial chemicals were found to be damaging to atmospheric ozone?

What phenomenon occurs during the sunless winter months above the Earth's poles that contributes to ozone depletion?

What international agreement was implemented to phase out the use of CFCs and protect the ozone layer?