March 8, 1989 |
A major international environmental conference ended here Tuesday after 13 more nations agreed to join a global accord to save the Earth's ozone layer from destruction by harmful chemicals. Their commitment to reduce the consumption of those chemicals by 50% by the turn of the century came in the wake of a drive by major industrial countries, including the United States, to go even further by totally banning the chemicals by the year 2000.
August 2, 2003 |
The rate of destruction of the protective ozone layer in the upper reaches of the atmosphere is slowing. Scientists say the phenomenon mirrors a decline in the use of certain man-made chemicals. NASA satellite observations showed that the rate of ozone layer depletion matched a drop in chlorofluorocarbons, used in refrigeration and air-conditioning, scientists said.
April 4, 1993 |
The countdown began Saturday for the launch of the shuttle Discovery on an atmospheric research mission that will include a check on ozone levels. For the second year in a row, ozone levels this winter were 9% to 20% below normal over parts of the Northern Hemisphere, the World Meteorological Organization has reported.
CALIFORNIA | LOCAL
February 1, 1988 |
Scientists at the U.S. National Oceanic and Atmospheric Administration who have studied the loss of ozone over the South Pole are turning their attention to the North Pole. In the Antarctic study, NOAA scientists gathered data on the effects of chemicals in the creation of a hole in the ozone layer over the South Pole.
May 22, 2004 |
NASA's Jet Propulsion Laboratory will have a little more on its plate come June 19, the day Aura is scheduled to be launched from Vandenberg Air Force Base to study the atmosphere and the ozone layer. Aura will be used to help answer key scientific questions, including whether the Earth's ozone layer is recovering. Aura also is expected to help scientists understand how atmospheric composition responds to Earth's changing climate.
May 31, 1996 |
Ozone-destroying chemicals are declining in the atmosphere for the first time, according to researchers who say that means the ozone hole high above the Earth could start closing within 10 years. "A detectable signal for ozone recovery is expected around 2005 or 2010," said Stephen A. Montzka, a researcher in the National Oceanic and Atmospheric Administration laboratory in Boulder, Colo., and one of eight coauthors of a study published today in the journal Science.
September 1, 2007 |
A hole in the ozone layer over Antarctica has appeared earlier than usual this year, the United Nations weather agency said Tuesday. The World Meteorological Organization said it would not be clear for several weeks whether the ozone hole, which is expected to continue growing until early October, would be larger than its record size in 2006.
July 20, 1991 |
The eruption of Mt. Pinatubo could lead to reduced levels of protective ozone over North America and Europe this winter and next summer, possibly increasing the risk of skin cancer, a study suggests. In a band stretching across the northern United States, ozone levels may decline by about 12% from January to March, compared to normal levels for the period, researcher Guy Brasseur said.
May 27, 2000 |
The thinning ozone layer over the Arctic may be headed for even more dramatic losses because of global warming, according to research that will be presented Wednesday at the American Geophysical Union meeting in Washington, D.C. Currently, ozone depletion is much more severe over the Antarctic, where there is a hole in the ozone layer.
April 15, 1993 |
Scientists studying atmospheric ozone depletion have long believed that pollutants ravage the Earth's protective ozone layer only at certain times of the year, when sunlight and other conditions are just so. Now, however, satellite measurements made by scientists at the Jet Propulsion Laboratory in Pasadena and at Edinburgh University in Scotland indicate that the ozone-destroying process operates for extended periods.