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Satellite- and balloon-borne instruments showed that the amount of ozone over Antarctica bottomed out in early October at a value of 90 to 92 Dobson units, the same as last year. The satellite also showed that ozone concentrations in the worst section of the hole bottomed out at 90 Dobson units, only one-third of what should normally be there this time of year. The minimum value recorded this year, 112 Dobson units. |
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