A record-breaking ozone hole that formed over the Arctic this spring has closed, researchers announced late last week.

Scientists at the Copernicus’ Atmospheric Monitoring Service tracking the “rather unusual” ozone hole announced Thursday on Twitter that it had ended. The group said the hole was caused by a polar vortex and closed when that vortex split.

“COVID19 and the associated lockdowns probably had nothing to do with this,” the group said repeatedly on Twitter. “It’s been driven by an unusually strong and long-lived polar vortex, and isn’t related to air quality changes.”

A polar vortex is a large area of cold air high in the atmosphere that normally spins over the North Pole. An ozone hole is a dramatic thinning of the ozone layer that’s typically boosted in size by colder temperatures.

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