The ozone layer is a thin layer of gas in the Earth's atmosphere that absorbs most of the sun's ultraviolet (UV) radiation. This helps to protect life on Earth from harmful UV rays, which can cause skin cancer and other health problems.

However, the ozone layer has been weakening due to human activities such as burning fossil fuels and releasing chemicals into the atmosphere. This has led to a decline in the ozone layer's ability to protect us from harmful UV rays.

Fortunately, there have been some positive developments in recent years. The Montreal Protocol, signed in 1987, aimed to reduce the emissions of ozone-depleting substances (ODSs) such as chlorofluorocarbons (CFCs) and halons. These substances are used in refrigeration, air conditioning, and aerosol sprays.

In addition, scientists have developed new technologies that can help to restore the ozone layer. For example, the use of ozone-neutral chemicals in agriculture and industry can help to reduce the amount of ODSs released into the atmosphere.

Overall, it is encouraging to see that the ozone layer is beginning to heal. However, it will take many years and concerted efforts from governments, industries, and individuals to fully restore its protective function.