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The Antarctic ozone hole is back to an average size, shrinking about 16 percent from last year's record high, NASA said Friday. But it's still the size of North America.
The ozone hole over Antarctica has shrunk 30 percent as compared to last year's record size. According to measurements made by ESAâ€™s Envisat satellite, this yearâ€™s ozone loss peaked at 27.7 million tonnes, compared to the 2006 record ozone loss of 40 million tonnes.
This year's Antarctic ozone hole is the biggest ever, government scientists said Thursday. The so-called hole is a region where there is severe depletion of the layer of ozone - a form of oxygen - in the upper atmosphere that protects life on Earth by blocking the sun's ultraviolet rays.
Ozone measurements made by ESAâ€™s Envisat satellite have revealed the ozone loss of 40 million tonnes on October 2, 2006 has exceeded the record ozone loss of about 39 million tonnes for 2000.
NASA researchers, using data from the agency's AURA satellite, determined the seasonal ozone hole that developed over Antarctica this year is smaller than in previous years.
GENEVA (Reuters) - Depletion of the ozone layer above Antarctica, caused by emissions of industrial chemicals, seems to have peaked, indicating that global environmental pacts were working, U.N. scientists said on Tuesday.
A new global study involving long-term data from satellites and ground stations indicates Earth's ozone layer, while still severely depleted following decades of thinning from industrial chemicals in the atmosphere, is no longer in decline.