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The ozone hole was first thought to be an unnatural phenomenon, and we got all worried about that. Once we monitored the size of the ozone hole and how that seemed to increase each year, and once we monitored the UV-B radiation incident on the surface of the Earth, then we had a measure of ozone depletion. These measurements started in the early 1970s, with expectation of a positive result probably by the mid to late 1990s (with solar cycles contributing to fluctuations in ozone, and that is an 11 year cycle). So I'd guess 1995 or so. See the link below for more information.
What else can I help you with?
Who discovers that the ozone layer was already damage?
Dr Joseph Farman discovered Ozone depletion. He noticed it over Antarctica.
Where was an “ozone hole” discovered in the 1980s?
The ozone hole was discovered over Antarctica.
Ozone depletion occurs in the?
Ozone depletion occurs in the ozone layer.
What is depletion zone?
Ozone depletion is the thinning of ozone layer below a certain concentration. This phenomenon is termed as ozone depletion.
Is global warming a factor that cause ozone depletion or a result of ozone depletion?
Global warming and ozone depletion are not related.
When was the ozone depletion discovered?
Ozone depletion was discovered on a single day. It was a research conducted over a period of days.
Who invented ozone depletion?
Ozone depletion was invented by Dr. Joseph Farman. he discovered the ozone hole.
What was ozone depletion discovered?
Ozone depletion was first noticed in 1985, the same set of measurements that established the ozone hole. There is evidence that ozone has been more-or-less steadily increasingly depleted, worldwide, since the early 1700s.
When was ozone and the ozone layer and ozone depletion and the ozone hole discovered?
OzoneOzone was discovered by by Christian Friedrich Schönbein in 1839 - 1840The ozone layer was discovered by Charles Fabry and Henri Buisson in 1913.Depletion of the ozone layer was identified by the US Academy of Sciences in 1976 as being in agreement with the available data.The ozone hole was discovered by Joseph Farman (team leader), Brian Gardiner, and Jonathan Shanklin in 1984 (reported in 1985).See links below.The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson.
Who discovers that the ozone layer was already damage?
Dr Joseph Farman discovered Ozone depletion. He noticed it over Antarctica.
Where was an “ozone hole” discovered in the 1980s?
The ozone hole was discovered over Antarctica.
Ozone depletion occurs in the?
Ozone depletion occurs in the ozone layer.
What is definition of Ozone layer depletion?
Ozone depletion is the depletion of ozone molecules. It is happening because of CFC's.
What is the mjor cause of the ozone depletion?
The major cause of ozone depletion is the reaction of CFC with ozone. They decompose ozone and cause its depletion.
What does zone depletion refer to?
Ozone depletion refers to the depletion of ozone molecules. These molecules are present in the ozone layer.
What are the solutions the depletion of the ozone layer?
The solution for ozone depletion is curbing CFC's. They could prevent ozone depletion.
Does the atmosphere prevent depletion of the ozone over Antarctica?
The atmosphere does not protect the ozone depletion. It is the region where the ozone depletion occurs.
