The 2020 ozone hole over the Antarctic is one of the largest and deepest in recent years, according to scientists with the Copernicus Climate Change Service (C3S). The hole had grown to 23 million square km (8.8 million square miles)-- over twice the size of the U.S. This is above average for the last decade and is spreading over much of the Antarctic continent.

"There is much variability in how far ozone hole events develop each year," said Vincent-Henri Peuch, Director of Copernicus Atmosphere Monitoring Service at ECMWF.

"The 2020 ozone hole resembles the one from 2018, which also was a quite large hole, and is definitely in the upper part of the pack of the last fifteen years or so."

"With the sunlight returning to the South Pole in the last weeks, we saw continued ozone depletion over the area. After the unusually small and short-lived ozone hole in 2019, which was driven by special meteorological conditions, we are registering a rather large one again this year, which confirms that we need to continue enforcing the Montreal Protocol banning emissions of ozone-depleting chemicals."

NASA’s Ozone Watch reports the lowest value of 95 Dobson Units recorded on October 1, and scientists are seeing indications that this year's ozone hole has appeared to have reached its maximum extent.

The large and deep ozone hole has been driven by a strong and stable cold polar vortex, which kept the temperature over Antarctica consistently cold.

The hole grew fast from mid-August and peaked at around 24 million square km (9.2 million square miles) in early October. It now covers 23 million square km (8.8 million square miles)-- above average for the past decade and is spreading over much of the Antarctic.

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