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September’s ozone hole was the biggest in 20 years. The warning signs appeared months ago

By Hannah E. Kessenich, Postdoctoral Fellow in Physics, University of Otago
Annika Seppälä, Associate Professor in Atmospheric Physics, University of Otago
Dan Smale, Principal Technician Atmosphere, Earth Sciences New Zealand

This spring’s ozone hole is likely to be among the top ten most severe of all time, bringing weather changes to New Zealand and Australia.

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