What is the chemical formula for the ozone that protects us from UV rays?

Ozone is a toxic, strong reactive compound consisting of three oxygen atoms. The word is derived from the Greek word ozein, what means 'to smell'. Not without a reason because the gas has a terrible odour. The chemical formula is O3. Ozone is formed when oxygen molecules are separated by a certain form of solar ultraviolet radiation at high altitudes. The individual oxygen atoms combine with oxygen molecules (O + O2 = O3). In the stratosphere about 300 million tons of ozone are produced daily. There are two kinds of ozone: the high atmospheric ozone and the tropospheric ozone at the earth's surface.