Ozone is created and destroyed in the atmosphere. More likely agents in ozone production are: ultraviolet radiation, cosmic rays and electric storms.

Although the ozone contained in the atmosphere is less than a part per million with regard to other gases, its lack influences harmfully on living beings.

Ozone formation, from the gaseous oxygen by the action of ultraviolet radiation determined, once the quantity of this gas established, the gradual evolution of current life forms, non-compatible with filtered wave longitudes, and autoregulating the biosphere.

Although until the present there are only quantitative relations concerning the dose-effect relation, it is known that this radiation can cause some skin cancers, cataracts and inmunodeficiencies in humans, as well as troubles in plant and animal growth and reproduction, in particular in phytoplankton, base of food chain of sea life.

Ozone is distributed in a layer (ozone layer) going from 12 up to 35 km altitude approximately.

Over last decades, an ozone layer depletion has been observed, almost 3% every ten years, due apparently to the presence in the atmosphere of chlorofluorocarbons (CFCs) and halons, a family of gases produced by human activity.

But it is on the Antarctic Continent where this depletion has shown special characteristics, with the phenomenon so-called "Ozone Hole".

Actually, there is no "Hole".

In a seasonal way, between August and November, an area with notably low values in the concentration of ozone is observed from middle of the 70's, and a narrow area that delimits it with strong gradients, by separing such low values by a cercle with high gas concentration.

This phenomenon covers one of the more interesting areas from a scientific point of view with respect to the global change question.