Well, I don't know about the measurements - I'm just an ignorant programmer, not a climatologist. :)

But AFAIK you can get sunburnt in extreme latitudes, ozone or no ozone in fact.

http://arcticglass.blogspot.com/2006/04/bedroom-view-938-pm_... http://www.wired.com/science/discoveries/news/2008/10/dayint...