layer acts as Earth's natural shield against ultraviolet radiation, which can cause skin cancer.
To monitor the state of the ozone
layer above Antarctica, visit:
The upper part of the atmosphere over the South Pole was colder than average this season and that cold air is one of the key ingredients for ozone
destruction," said James Butler, director of NOAA's Global Monitoring Division in Boulder, Colo.
These findings add further evidence that our ozone
standards are not protecting the most vulnerable members of the population,'' said Frank D.
What this means, the researchers conclude, is that ozone
"may be a significant and now commonplace stressor of wildlife populations.
The automatic measurement and control system continually and rapidly corrects for ozone
concentration changes regardless of influencing variables.
Later experiments in controlled settings found that the same trees, when exposed to high levels of ozone
, grew haft as large, according to the article.
The unusual warmth defused CFCs and allowed ozone
molecules, which form spontaneously in the stratosphere, to regenerate and shrink the hole.
depletion issue is a good example of the no-net-harm principle combined with the precautionary principle--acting on our knowledge when we have the presumption of a problem," says Davies.
Or that ozone
went from something that killed trees in 1990 to something that was indirectly created by them in 1993?
stops much of the sun's ultraviolet-B light from reaching the earth's surface, where excessive amounts can harm plants and animals.
Retailers can sanitize fruits and vegetables by exposing them to ozone
before they go on sale," said Gary Rodrick, a professor with the University of Florida's Institute of Food and Agricultural Sciences.
NASA and the National Oceanic and Atmospheric Administration (NOAA) use balloon-borne instruments, ground-based instruments and satellites to monitor the annual Antarctic ozone
hole, global levels of ozone
in the stratosphere and the manmade chemicals that contribute to ozone
More than 100 million Americans live in areas that exceed the EPA's National Ambient Air Quality Standard (NAAQS) for ozone
of 80 parts per billion (ppb) ozone
averaged over a peak 8-hour time period.
So far, the Southland has logged 76 smoggy days under the nation's new, more stringent ozone
standards - nearly double Houston's 41 dirty days and more than the San Joaquin Valley's 61 smog days.