|The following timeline is a combination
of material quoted from Sharon Roan's book entitled "Ozone Crisis;
The 15 Year Evolution of a Sudden Global Emergency", and up-to-date
information from current research scientists. It demonstrates the
course of events that have taken place since the first ozone destroying
pollutants were identified more than 20 years ago.
||Rowland and Molina first discover that chlorofluorocarbons
(CFCs) can destroy stratospheric ozone.
hearings are held on the CFC-ozone theory.
||Natural Resources Defense Council sues Consumer Product
Safety Commission for a ban on CFCs used in aerosol spray cans. Lawsuit
is rejected due to insufficient evidence that CFCs harm the ozone
||National Academy of Sciences releases report verifying
Rowland-Molina hypothesis, but recommends postponing government action.
||The United Nations Environmental Programme holds first
international meeting to discuss ozone depletion.
United States bans CFCs used in aerosols.
Total Ozone Mapping Spectrometer (TOMS) is launched
aboard the NIMBUS-7 spacecraft.
||Ozone loss of 40% is detected over Antarctica during
Vienna Convention, calling for additional research,
Satellite images show existence of an Antarctic ozone
||International negotiations resume in Geneva. United
States requests global CFC reductions of 95% over the next 10 years.
Montreal Protocol, for CFC reductions of 50% by 1999,
Antarctic studies find chlorine to be primary
cause of ozone depletion.
||Ozone losses of 1.7 to 3% are measured over Northern
||International delegates meet in London to strengthen
the Montreal Protocol and agree to a complete phaseout of CFCs by
Upper Atmospheric Research Satellite (UARS) is launched.
Meteor-3 TOMS is launched.
Mt. Pinatubo erupts, increasing natural levels of
Airborne Arctic Stratospheric Expedition (AASE I)
studies northern vortex.
Record levels of ClO, 1.5 parts per billion, are measured
over Bangor, Maine. Ozone depletion rates of up to 20% are found
in the Northern Hemisphere. Maximum losses of 40 to 45% discovered
Parties to the Montreal Protocol meet in Geneva and
agree to a 75%reduction in CFCs by 1994 and overall phaseout by
January of 1996.
Production grace period, to supply CFCs for essential
purposes and the needs of developing countries, is extended to 2006.
||The TOMS aboard Nimbus 7 fails on May 6.
||The Meteor-3 TOMS fails on December 27.
||Professor Paul Crutzen, Professor Mario Molina, and
Professor F. Sherwood Rowland receive the Nobel Prize in Chemistry.