Before we come to know how hole in ozone layer over Arctic is healed, we must first understand what does Ozone Layer actually mean?
Ozone Layer is found in the lower region of earth’s stratosphere (i.e., a second layer of atmosphere which is just between the troposphere (i.e., first layer of earth’s atmosphere) and the mesosphere (i.e., third layer of earth’s atmosphere) that prevents Sun’s ultraviolet radiation or UV rays from entering into the earth since UV rays can cause many damages to humans such as it can cause skin cancers (Melanoma and Non-Melanoma), eye cataracts and other eye damages, premature aging and other skin damages, immune system disorders.
Now we know what ozone layer is and what is its benefits, so we must also know how Ozone layer depletes. Ozone layer depletion happens when Chlorofluorocarbons (CFC(s)) and halons found in aerosol spray cans and refrigerants are let out into the atmosphere. Ozone layer depletion over Earth’s polar regions is referred to as ‘Ozone Hole’.
As we know now what is ozone layer, what is its benefits and how this protective layer depletes, we must come to the actual reason behind this blog i.e., to know how the largest identified hole in Ozone layer spreading over 1 million square kilometers (km) above Arctic is closed now.
Some has linked this healing of Ozone layer with COVID-19 lockdown in the sense that this recovery could have only been possible due to lockdown amid COVID-19 pandemic came into the picture. But, the closing of the ozone layer hole over Arctic has nothing to do with the shutdown of industries (that releases lots of pollution into the atmosphere) due to lockdown. This could have only been possible because of the polar vortex, high-altitude currents which are responsible for bringing cold air to polar regions.