| 11. | Thus NO 2 is an important diagnostic of ozone hole chemistry.
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| 12. | You may complain about our contributions to global warming or the ozone hole,
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| 13. | Over each of the previous four years, the ozone hole doubled in size.
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| 14. | The ozone hole is the region with total ozone below 220 Dobson units.
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| 15. | The ozone hole is still growing, but disaster has at least been postponed.
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| 16. | Measurements from Halley led to the discovery of the ozone hole in 1985.
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| 17. | The animations of the South Pole ozone hole cover only half the year.
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| 18. | Together with Joe Farman and Jonathan Shanklin he discovered the " Ozone Hole ".
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| 19. | The size of the ozone hole has doubled each of the previous four years.
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| 20. | The Antarctic ozone hole is mapped from weather satellite data.
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