The Arctic’s ozone layer developed a tear, which grew into a hole and then a bigger hole. Now, it may be biggest hole the North Pole’s ozone layer has ever incurred.

This hole in the Arctic ozone layer reached an area of over 620,000 square miles (sq mi) since it was first spotted in February, said Diego Loyola, a scientist at the German Aerospace Center, in a statement to the European Space Agency.

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