Cusco Peru has been known to have UV25 - obviously altitude plays a large part but it's not as high has the one I linked above. Above is actually a snow covered mountain so that might explain why it's much higher than surrounding locations.
I read that, following a nuclear exchange, the soot ejected into the stratosphere would create super-warming there, destroying the ozone layer.
UV index values across most of the world would be at/over 35.
Martin
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