How science saved the ozone layer

Concentration of ozone (in Dobson units) as of mid-September 2022, based on measurements by the IASI infrared sounder over 15 years above Antarctica. The extent of damage and geographical distribution of the hole (in blue) varies according to weather conditions. Anne Boynard/LATMOS, CC BY-NC-ND

On 9 January 2023, the United Nations released its latest report on the status of the ozone layer. It highlighted that this protective barrier is on track toward recovery and should be fully restored by the second half of the 21st century.

There is an urgent need for solutions to help limit climate disruption, yet effective decision-making remains challenging. In light of this context, it is worthwhile to recall the scientific saga that led to the signing of the 1987 Montreal Protocol.