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 | | The only time more NOx was observed in the upper stratosphere was in the winter of 2003-04, when huge solar storms bombarded the region with energetic particles, triggering up to a 60 percent reduction in ozone molecules, said Randall. |
 | | The upper stratosphere lies several miles higher than the ozone hole region, which forms in the lower stratosphere and is caused by emissions of man-made gases like chlorine and bromine over the decades that are still gobbling up ozone molecules, she said. |
 | | Because there is significantly less ozone in the upper stratosphere, the ozone-destroying NOx gases are unlikely to cause immediate health threats, such as increases in skin cancer, she said. |
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