What is the Meaning of Depletion of Ozone Layer Ozone Depletion The amount of ozone in ozonosphere began to drop in 1980s. A spring time ozone hole (area of extreme thinness of ozone) was discovered over Antarctica in 1985 by Farman et al. Its area has been spreading subsequently. An ozone reduction of 1% increases the amount of high energy UV–B radiations reaching the earth … [Read more...] about What is the Meaning of Depletion of Ozone Layer