The ozone layer protects us from harmful UV rays, but human activities like using certain chemicals are causing it to deplete. This depletion is letting more UV radiation reach the Earth, which can lead to health issues like skin cancer and weakened immune systems in humans. Scientists believe that by controlling the use of these harmful chemicals, the ozone layer can recover by the middle of the 21st century. Monitoring systems are in place to track changes in the ozone layer, and research is ongoing to find safer alternatives to these harmful chemicals.