An ozone hole that formed over the Arctic this spring and eventually grew into the largest ever recorded there has closed. Scientists say the 'rather unusual' hole was caused not by human activity but a particularly strong Arctic polar vortex.
An ozone hole that formed over the Arctic this spring and eventually grew into the largest ever recorded there has closed.
Scientists who were tracking the hole at Copernicus' Atmospheric Monitoring Service made the announcement late last week, noting the"rather unusual" hole was caused not by human activity but a particularly strong Arctic polar vortex, CAMS said.
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