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" Although production of ozone destroying gases has been curtailed under international agreements, concentrations of the gases in the stratosphere are only now reaching their peak. Due to their long persistence in the atmosphere, it will be many decades... "
NASA and the environment the case of ozone depletion - Page 43
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A Textbook in Environmental Science

V. Subramanian - Science - 2002 - 238 pages
...lowest readings in the ozone hole are typically observed in late September or early October each year. "These observations reinforce concerns about the frailty of Earth's ozone layer. Although production of ozone destroying gases has been curtailed under international agreements, concentrations of the gases...
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