Life on Earth would not be possible without sunlight. But the energy emanating from the sun would be too much for life on Earth to thrive were it not for the ozone layer. https://ozone.unep.org/ozone-day/ozone-life-35-years-ozone-layer-protection
The depletion of the ozone layer is one of the most important environmental problems that we all face in the world. The ozone hole is not really a hole. Ozone is a thinning of the layer. Because of chemicals that are used in our daily lives, the ozone layer is getting thinner. These chemicals are used in our daily lives and they damage the ozone layer.
On September 16, 1987, the Montreal Treaty was signed in order to control the production and consumption of ozone-depleting substances such as HCFC, CFC, methyl bromide etc., to determine the reduction program and rates, to remove these substances of use, to research and develop alternative substances and technologies to replace them, to meet needs of developing countries for these substances.
The International Day for the Protection of the Ozone Layer was declared by the United Nations General Assembly on September 16, 1994. It has been celebrated since 1995.
It may take a long time for the gases to move between the lower atmosphere and the stratosphere and eventually disappear. It takes 30-40 years for the ozone hole to become the same as in the 1980s.
Due to a volcano erupting in Chile in 2015, the ozone hole has reached the level of the 4th largest hole of all time.
https://eapsweb.mit.edu/news/2017/volcanic-eruption-expanded-ozone-hole-record-size
Although we have done our best in 32 years, the delicate state of the ozone layer remains.
Always keep protecting the Earth and the special days help people to realise the current situation of the world at least for a day.
Happy Ozone Day folks!