What is ozone layer? The ozone layer is a layer of ozone which blocks harmful ultraviolet light to reach the surface of the earth.

With this important role of ozone, ozone depletion is happening right now.


Human is responsible for ozone depletion. There were many chemicals substances we made and we realized the impact just after they damage our environment.

Even after CFC is banned, CFC can stay in the atmosphere for 120 years. It is our job to minimalize the usage of environment-harmful substances.




The ozone layer can be found on the Earth’s Stratosphere. It is essential for mankind because it absorbs the UV radiation from the sun and shield us from it.


However, humans use a lot of products that will deplete the ozone layer. Such products releases ozone-depleting chemicals such as CFCs. This is terrible.


Fortunately, if we cooperate and cut down on ozone-depleting products, we can protect our ozone layer. The Montreal Protocol on Substances that Deplete the Ozone Layer  is an international treaty which includes phasing out the production of numerous substances that are responsible for ozone depletion. Since then, the atmospheric concentrations of the most important chlorofluorocarbons and related chlorinated hydrocarbons have either leveled off or decreased. We have made improvements!

Let us do our part to protect our Earth.

The ozone layer can absorb some harmful UV rays and help to protect humans from its harmful effects. Unfortunately, some of the rays still penetrate through the ozone layer and enter the Earth’s atmosphere and harm us. This is why it is important to use sun protection such as sun block or sunscreens. The amount of sun protection factor recommended has been studied and mainly categorised by the time spent outdoors and the skin tone, as seen from the SPF selection guide below. Higher SPF required is usually for longer hours spent outdoors and for fairer skin tones.



Today we had a fruitful discussion on the ozone layer (or lack thereof). The second part of this class is based on learning OSS. The threat of the loss of the ozone layer is real and as time passes, its effects are more and more significant. ozone