Ozone Depletion Timeline By De'Miko Nelson Oct 1, 1970 The discovery of the loss of ozone in the stratosphere was in 1970. The discovery of the loss of ozone in the stratosphere was in 1970. Jan 1, 1974 Scientists discover aerosol cans can damage the ozone laye May 15, 1984 British Antarctic Survey scientists discover recurring springtime Antarctic ozone hole Sep 1, 1985 British scientists got first direct evidence that it was really happening Sep 1, 1987 International team returned from Antartica reveal cause of ozone problem Aug 23, 1989 Ten years of satellite data begin to show measurable ozone depletion globally Jan 1, 1991 DuPont announces phase-out of CFC production by end of 1996 Apr 1, 2006 Ozone becomes largest hole on record Jan 1, 2018 Decrease in ozone hole May 15, 2050 Springtime Antarctic ozone hole disappears