What's going on with the hole in the ozone layer? Thanks to a global effort to regulate ozone-depleting substances, the ozone hole is showing signs of recovery and is projected to return to a healthy level by mid-century. However, at NASA, scientists continue to monitor its progress. NASA’s Goddard Space Flight Center Qing Liang explains more. Keep up: https://go.nasa.gov/3DhEBvp | NASA - National Aeronautics and Space Administration