when did we first notice that a hole was developing in our ozone layer (what year)?

Answer 1

It was discovered in 1985 by 3 British scientists - Joe Farman, Brian Gardiner and Jonathan Shanklin

Answer 2

The ozone layer is doing just fine and was a natural phenomena and never represented a problem. The ozone layer is at the edge of space and nothing gets that high. The ozone layer is formed when the solar winds collide with the earth's magnetic field.

Answer 3

A seasonal decrease, or "hole," discovered in 1985 in the ozone layer above Antarctica was the first confirmation of a thinning of the layer.