-
1830
Christian Schöenbein identifies ozone in the laboratory -
1830
Christian Schöenbein identifies ozone in the laboratory -
1845
Auguste de la Rive and Jean-Charles de Marignac suggest ozone is a form of oxygen; confirmed by Thomas Andrews in 1856 -
1845
Auguste de la Rive and Jean-Charles de Marignac suggest ozone is a form of oxygen; confirmed by Thomas Andrews in 1856 -
1858
Andrei Houzeau finds ozone present in natural air -
1858
Andrei Houzeau finds ozone present in natural air -
1865
Jean-Louis Soret proves that ozone is O3 -
1865
Jean-Louis Soret proves that ozone is O3 -
1879
Marie Alfred Cornu measures solar spectrum and finds sharp cutoff in ultraviolet (UV) light -
1881
Walter Hartley recognizes cutoff corresponds to UV absorption by ozone -
1913
John William Strutt (Lord Rayleigh) shows absorption is not in lower atmosphere -
1919
Charles Fabry makes first spectrometric measurements of "thickness" of ozone layer -
1924
G.M.B. Dobson develops ozone spectrophotometer and begins regular measurements of ozone abundance (Arosa, Switzerland) -
1925
Jean Cabannes and Jean Dufay show ozone is about 10 miles high -
1928
Thomas Midgley synthesizes chlorofluorocarbons (CFC's) -
1930
Sydney Chapman describes theory that explains existence of an ozone "layer" -
1934
Ozonesonde (balloon) measurements establish the ozone concentration is maximum around 12 miles up -
1950
David Bates and Marcel Nicolet propose catalytic (HOx) ozone destruction -
1960
Catalytic destruction is necessary in order to explain ozone amounts -
1969
Paul Crutzen discovers NOx catalytic cycle -
1971-1974
Dept of Transportation sponsors intensive program of research, The Climatic Impact Assessment Program (CIAP) -
1980
Renewed expansion of CFC market -
1996
CFC production ends in US and Europe -
2000
Maximum CFC concentrations in stratosphere are reached -
2010
CFC production ends world-wide
