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Why can't we just fill in the ozone hole with man-made ozone? © iStock

Why can't we just fill in the ozone hole with man-made ozone?

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The notorious hole would require tens of millions of tonnes off ozone to fill it - not a cheap or easy task.

Asked by: David, Camilleri Msida, Malta

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The sheer scale of the notorious hole - or, more accurately, depleted region - in the Earth's ozone layer over the Antarctic beggars belief. At its peak each September, it spans an area bigger than the continental United States, and tens of millions of tonnes of ozone would be needed to fill it up again. Simply creating that amount of ozone, let alone getting it where it's needed, would be astronomically expensive.


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Authors

Robert is a science writer and visiting professor of science at Aston University.

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