Stephen Montzka

Rule Changes

Active; tracks stratospheric chlorine and other ozone-depleting compounds

On September 18, the hole in the ozone layer over Antarctica covered 10.5 million square miles, about 90% of the largest single-day extent ever measured. Averaged across the peak depletion season from September 7 to October 13, it was the seventh-largest hole in 48 years of satellite records.

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