Past studies have used statistical analyses of changes
in the ozone hole's size to argue that ozone depletion is decreasing.
NASA finds first direct proof of ozone hole recovery due to chemicals ban
The minimum value of total ozone
in the ozone hole was the second highest level in two decades.
Ozone Hole Reaches Max Sept. 22
If bromine concentrations peaked in the lower atmosphere in 1998, then they should soon be declining up
in the ozone layer, if they aren't already.
Ozone-killing bromine is on the decline
For two decades, an ominous hole
in the ozone layer has ballooned over Antarctica, alarming scientists.
The incredible shrinking ozone hole. (Earth News/Graph It!)
Even
in the ozone layer, Earth's highest natural ozone concentration, only about 3 molecules of ozone occur for every 10 million molecules of air.
Living With Ozone
Scientists estimate that every one percent decrease
in the ozone layer increases ultraviolet light intensity at the earth's surface by two percent.
Ozone: the pollution paradox
This also means that the seasonal holes
in the ozone layer over the Arctic and Antarctic would represent nothing more than normal fluctuations
in the ozone layer.
Trees and volcanoes cause smog! (More myths from the "Wise Use" movement)
The ring design of the annulus test piece (inside diameter exactly 1/2 the outside diameter) allows a continuous range of strain observations (0 to 100%) when the test piece is mounted
in the ozone test chamber apparatus.
New research on wax
Ten years later, when another scientist detected a "hole"
in the ozone layer over Antarctica, people began to heed Molina's warnings.
Breakthrough: the changing face of science in America
Ozone holes - regional thinnings
in the ozone layer - have developed over the Antarctic continent each September since the late 1970s.
Volcanic bite out of Antarctic ozone?
That weakening
in the ozone layer would let some 6 to 12 percent more ultraviolet light reach Earth's surface, raising the risk of skin cancer, cataracts and damage to animals and plants.
The supersonic question: will fleets of high-speed jetliners damage the fragile ozone layer?
Most chlorine
in the ozone layer comes from chlorofluorocarbons and other forms of pollution.
U.S. skies harbor ozone destroyer
The hole is a reduction
in the ozone layer that normally shields Earth's surface from much of the sun's ultraviolet rays.
Ozone hole hikes Antarctic ultraviolet
Schoeberl, an atmospheric scientist with NASA, also notes that chlorine monoxide (ClO)--a principal chemical active
in the ozone destruction--was not always present at altitudes that would account for the low ozone levels.
Antarctic ozone reaches lowest levels