Antarctic Ozone Hole Ranks Seventh Largest on Record in 2026

The National Aeronautics and Space Administration (NASA) and the National Oceanic and Atmospheric Administration (NOAA) reported on 4 November 2026 that the 2026 Antarctic ozone hole ranked seventh largest in 48 years of monitoring, based on its seasonal average area.

Scientists attributed its unusually large extent partly to a powerful polar vortex and atmospheric conditions favourable for ozone depletion. However, they emphasised that the ozone layer remains on track for long-term recovery.

Key Highlights

Why Does the Ozone Hole Form?

The ozone layer is located in the stratosphere and protects Earth from harmful ultraviolet radiation.

Ozone depletion occurs when chlorine- and bromine-containing chemicals, including substances released from older industrial products, reach the stratosphere and participate in chemical reactions that destroy ozone.

Extremely cold Antarctic conditions and polar stratospheric clouds accelerate these reactions.

Role of the Montreal Protocol

The Montreal Protocol, adopted in 1987, established international controls on ozone-depleting substances such as chlorofluorocarbons (CFCs).

NASA and NOAA scientists say the decline in ozone-depleting chemicals demonstrates the effectiveness of international environmental cooperation. Despite the large 2026 ozone hole, long-term recovery is expected to continue, with Antarctic ozone recovery projected for the 2070s.

Important Facts for Exams

Question	Answer
2026 ozone hole ranking	Seventh largest
Monitoring period	48 years
Maximum area	27.1 million sq. km
Ozone measurement unit	Dobson Unit
Montreal Protocol adopted	1987
Reporting agencies	NASA and NOAA