By Patrick Cullis, NOAA Global Monitoring Laboratory scientist

Each year in September, as the Sun returns to the sky above the South Pole after six months of darkness, a chemical reaction happens high in our atmosphere when human activity combines with natural phenomena to destroy part of our protective ozone layer. In the last episode of this animated series, Casper and Peggy learn how the ozone hole forms above Antarctica, the measurements NOAA scientists take to track it, and what scientists are doing to help the ozone hole heal from the damage we’ve done. 

Video by Patrick Cullis/NOAA Global Monitoring Laboratory

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