According to laymen beliefs, ozone is something pleasant and something even healthier than oxygen: two О atoms are good, and three are even better. But in fact this gas may be hazardous for human health. Indeed, there is a "beneficial" type of ozone. It can be found far up in the stratosphere at the altitude of 25 kilometres above the ground. There, the ozone layer of the Earth fulfils an important function: it ensures that life exists on the planet and protects all inhabitants of the Earth from the ultraviolet radiation of the Sun.
