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"Weather balloons carry ozone-measuring sondes that directly sample ozone levels vertically through the atmosphere." phys.org / NOAA

An ozone depleting gas is on the decline after rising since 2012, according to preliminary data reported by scientists yesterday, as the New York Times reported.

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The 2015 Antarctic ozone hole area. NOAA

A new study from the National Oceanic and Atmospheric Administration (NOAA) shows an "unexpected and persistent increase" in global emissions of an ozone-depleting chemical even though an international treaty forced production to completely halt by 2010.

NOAA scientists suggest that emissions are most likely from new, unreported production from an unidentified source in eastern Asia.

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