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Conclusions

In spring and summer, extreme values of the UV index, larger by a factor of two with respect to those registered at mid-latitudes near sea level, were determined for this very dry and desert high altitude region of Atacama, and verified at particular locations and periods of the year. Even in autumn and winter, rather high values of this index are common. Persons that live permanently there or that spend some periods of the year, must implement measures for protecting their skin and eyes.