Ozone depletion is a well-known phenomenon and, thanks to the success of the Montreal Protocol, is widely perceived as a problem solved. But, an international team of researchers has now found an unexpected, growing danger to the ozone layer from substances not regulated by the treaty.

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Ozone depletion is a well-known phenomenon and, thanks to the success of the Montreal Protocol, is widely perceived as a problem solved. But, an international team of researchers has now found an unexpected, growing danger to the ozone layer from substances not regulated by the treaty.