The new report says the Earth’s ozone layer is showing signs of recovery. Ozone is a form of oxygen. It is found in the air we breathe and in Earth's atmosphere. The ozone layer in the upper atmosphere protects life on Earth. The ozone there blocks harmful radiation from the sun. But near Earth, ozone is a common pollutant. It can harm people. crops and other plants. The UN report says the ozone layer appears to be improving because of a reduction of industrial chemicals into the air.
Science say the improving conditions are a result of international treaty signed in 1987. It is called the Montreal Protocol.
The Montreal Protocol was meant to end the use of or sharply reduce over 100 known ozone depleting substances.
It banned ozone depleting chemicals. including man- made chlorofluorocarbon, also known as CFC. They were once widely used in refrigerators, spray cans, insulation foam and fire suppression product .