Record ozone hole over Arctic in March now closed

An very big gap that opened up within the ozone layer above the Arctic in March has now closed up once more however United Nations scientists had been eager to level out that it has nothing to do with the Covid-19 pandemic. At the same time, she stressed that the event is not associated with a decrease in air pollution due to pandemic coronavirus, and it happened because of changes in the stratosphere.

However, World Meteorological Organization spokeswoman Claire Nulis told a press conference in Geneva yesterday that the ozone hole is now closed and it is normal.

The UN meteorological agency said depletion of the ozone layer, which protects the Earth from harmful levels of ultraviolet radiation, briefly reached an unprecedented level over large swaths of the Arctic in March.

This combination photo shows the Arctic ozone hole before and after recovery. The low temperatures caused by a polar vortex result in polar stratospheric clouds, which combine with polar stratospheric air to result in chlorine and bromine reactions that lead to ozone depletion.

‘Back to Normal Again’: Largest Ever Ozone Hole Above Arctic Has Closed
The UN World Meteorological Organization says a hole in the Ozone layer over the Arctic, the biggest since 2011, has now closed. Most ozone depletion in the Arctic occurs in the "polar vortex", a region of fast-blowing circular winds, it said.

Last month, the Copernicus Atmosphere Monitoring Service (CAMS) said the hole was "rather unusual".

"Although it looks like the polar vortex has not quite come to an end yet and will reform in the next few days, ozone values will not go back to the very low levels seen earlier in April", the organisation tweeted.

The Montreal Protocol of September 1987, which has been signed by 197 countries, including Canada, the USA and China, is an global treaty meant to protect the ozone layer by banning CFCs.

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