The ozone layer is a layer of gas high up in the atmosphere that helps protect us from the sun’s harmful rays. Without the ozone layer, we would be exposed to more harmful UV radio radiation from the sun, which could cause health problem such as skin cancer.
Chemicals that people have used in the past have caused the ozone layer to get thinner, which is a problem. The chemicals are called CFCs, and when released into the atmosphere they rise up to the ozone layer and break down the ozone molecules, which can have harmful effects on human health and environment.