Key learning points

1. The ozone layer protects life from harmful ultraviolet (UV) radiation from the Sun.
2. Chlorofluorocarbons (CFCs) were once used, and when they entered our atmosphere reacted with ozone (O₃).
3. Ozone levels decreased, but scientific communication led to action being taken to prevent further loss of ozone.
4. The work of analytical scientists suggests the ozone layer is now reforming.

Keywords

• Ozone - Ozone is made up of oxygen atoms. It has the molecular formula O₃.

• Ozone layer - The ozone layer refers to an area in the stratosphere where there is a high concentration of ozone.

• Ultraviolet (UV) radiation - Ultraviolet (UV) radiation is a type of electromagnetic radiation which is emitted from the Sun.

• Chlorofluorocarbons - Chlorofluorocarbons are compounds consisting of chlorine, fluorine and carbon atoms only.

• Analytical scientists - Analytical scientists use a range of scientific techniques to study the chemical composition of substances.

Common misconception