| Dec. 1973 |
|
Rowland and Molina made their discovery. |
| Oct. 1978 |
|
The use of CFCs in aerosols was banned in the United States. |
| Oct. 1984 |
|
British team reports 40% loss of ozone over Antarctica during austral (southern hemisphere) spring. |
| Sept. 1987 |
|
Montreal Protocol-representatives from 43 nations agree to CFC reduction of 50% by 2000. |
| Oct. 1987 |
|
Antarctic expedition verifies huge losses of ozone over the Antarctica during austral spring. |
| Mar. 1988 |
|
United States ratifies Montreal Protocol; large U.S. manufacturers announce they will cease production of CFCs. |
| Apr. 1988 |
|
Plastic foam manufacturers announce they will stop using CFCs. |
| Mar. 1989 |
|
Seven hundred representatives from 124 countries attend London conference on saving the ozone layer. |
| June. 1990 |
|
Environment ministers from 93 countries agree to strengthen Montreal Protocol with complete phase out of CFCs by 200 (and HCFCS by 2040). |
| Oct. 1990 |
|
U.S. congress passes revised Clean Air Act that includes phase out of CFCs by 2000. |
| Jan. 1991 |
|
Environmental ministers of the European Community agree to complete CFC ban by 1997. |
| Jan. 1992 |
|
Increased concentrations of ozone-depleting chemicals are found over populated areas in the northern hemisphere. |
| Feb. 1992 |
|
U.S. president moves target date for phase out of CFCs from the year 1995 to 2000. |
| Jan. 1, 1994 |
|
Halon production stops. EPA formally asks some companies to continue production of CFCs through 1995 to meet "consumer needs" in automotive air conditioners. |
| Oct. 1994 |
|
Antarctica ozone hole appears earlier than normal--covers 23 to 24 million square kilometers. |
| Jan. 1995 |
|
NASA satellite data confirm CFC link to ozone hole. |
