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Historically, the Antarctic ozone hole is largest during the month of October. This image shows the latest data from the Total Ozone Mapping Spectrometer (TOMS) Earth Probe, for the month of October 1999. Values below 150 Dobson Units (bright blue) are considered extremely low.
For more information, please visit:
September Ozone Hole
Ozone Fact Sheet
TOMS Project
Images by Robert Simmon, Research and Professional Services
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