-
-
-
-
-
The value of 220 Dobson Units is chosen since total ozone values of less than 220 Dobson Units were not found in the historic observations over Antarctica prior to 1979.
-
The British Antarctic Survey's first documentation of the Antarctic ozone hole in 1985 and subsequent NSF-funded study of the phenomenon alerted the world to the danger of chlorofluorocarbons, or CFCs.
-
-
-
In the northern polar regions, ozone levels in the early 1990s measured ten percent lower than those estimated in the late 1970s.
-
1999 National Medal of Science winner, Susan Solomon, conducted observations that have significantly advanced our understanding of the global ozone layer and changed the direction of ozone research.
-
The largest Ozone hole September 24, 2006.
-