It’s world ozone day, UN’s general assembly declared September 16 as World Ozone day on December 19, 1994. In 1987, representatives of 24 countries met in Montreal, to discuss about, how to prevent ozone layer depletion. Moreover, they end up signing the Montreal protocol, which addresses that one should get rid of substances contributing to ozone layer depletion. Also, the hole in ozone layer was observed, 30 years later from 1987.

Importance of Ozone layer:

Ozone layer protects earth’s surface from harmful ultraviolet radiations from sun. Moreover, the depletion will result to skin cancer, cataracts and several other damages to human kind. It will create a disturbance on the biological processes, which are necessary for life on earth.

UV Radiations:

How Does the Sun Damage Skin? | SE Radiation Oncology Group
Ultraviolet radiations affecting human skin.

UV radiations are form of electromagnetic radiation, within a wavelength range of 10 nm to 400 nm. They are shorter than visible light but stronger than X-rays.

There are three different types of UV radiations, UVA, UVB, UVC:

  • UVA Radiation: UVA radiation can cause wrinkles as well as skin cancer.
  • UVB Radiation: UVB radiation can cause skin cancer as well as sunburn.
  • UVC Radiation: This is most dangerous type of UV radiation, the people who uses welding torches and mercury lamps for work can face negative effects of UVC radiation.


CFCS stands for Chlorofluorocarbons, it was invented in 1920. Moreover, it was thought to be environmental friendly. However, later it was found that it is the reason that is creating a hole in ozone layer. CFCS is found in the refrigerators, fire extinguishers and aerosol propellants.

Is ozone layer healed?

According to scientists, the ozone depletion across Northern Hemisphere has healed.

Also, This year’s theme for the World Ozone Day 2020 is “Ozone for life: 35 years of ozone layer protection”.