Sunburn is potentially serious. In the northernmost tropical and subtropical deserts, nearly vertical solar rays are intense; in the oxygen-poor altiplano, sunburn can combine with altitude sickness to be life-threatening. Wearing a baseball cap or similar head covering is advisable; at lower altitudes, long-sleeved cotton shirts and long trousers help protect your skin. If you dress for the beach, use a heavy sunblock.
In southernmost Chile, where aerosols have damaged the ozone layer, ultraviolet radiation has caused skin problems for people and even for livestock such as cattle and sheep. Again, wear head coverings and a heavy sunblock.
© Wayne Bernhardson from Moon Chile, 2nd edition