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On September 16, 1987, representatives from nations around the world drafted a landmark treaty known as the Montreal Protocol.  This step marked the beginning of the international agreement to phase out substances that deplete Earth's protective ozone layer.  Now 25 years later, NASA satellites continue to provide clear snapshots of a generally stabilized Antarctic ozone hole as it cycles toward its annual maximum depth by late September or early October.  Pawan Bhartia is an atmospheric scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland and provides a historical perspective on this discovery.

In this podcast, the following questions are asked:

  • Now that we know what could have happened, what did happen?
  • Are we still tracking the hole and learning anything new?

For the complete Q and A on this topic, visit:


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