| 1. | The Dobson unit is the measure of ozone in the air overhead.
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| 2. | The ozone hole is the region with total ozone below 220 Dobson units.
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| 3. | The record low of 88 Dobson units was set in 1993.
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| 4. | A Dobson Unit is the total amount of a trace gas per unit area.
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| 5. | In the tropics, ozone levels are typically between 250 and 300 Dobson units year-round.
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| 6. | Ozone in the air overhead is measured in Dobson Units.
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| 7. | In the tropics, ozone levels are typically between 250 and 300 Dobson Units year-round.
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| 8. | Normally, at this time of year, the ozone concentration is 350 Dobson Units over England.
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| 9. | At that scale a reading of 250 Dobson Units translates to a layer about an inch thick.
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| 10. | Total ozone ( Dobson units ) measured at solar noon at Geronimo Creek Observatory since February 4, 1990.
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