Groundbreaking research in the s and s revealed signs of trouble.
Click to open interactive version When is the ozone layer expected to recover? Consumption fell by more than 60 percent by ; 80 percent by ; and by percent by How much of an impact will recent emissions of CFC have on ozone layer recovery?
Dijk et al. Antarctic ozone hole[ edit ] The discovery of the Antarctic "ozone hole" by British Antarctic Survey scientists FarmanGardiner and Shanklin first reported in a paper in Nature in May  came as a shock to the scientific community, because the observed decline in polar ozone was far larger than anyone had anticipated.
In correlating chemical pollution tracers and CFC emissions, the authors suggest there is strong evidence that the source of increased CFC emissions is Eastern Asia. The blue area therefore represents the estimated quantity of GHG or radiative forcing averted as a result of the Montreal Protocol.
Stratospheric ozone is that which is present in the upper atmosphere the stratosphere; typically extending from around 10 to 15km up to 50km depending on latitude.
Short-wavelength UV radiation splits an oxygen O 2 molecule into two oxygen O atoms, which then combine with other oxygen molecules to form ozone. Shown in the chart below is the level of natural emissions which has been approximately consistent over this periodand total emissions which is the sum of natural and man-made emissions.