The aim of this lecture is to present on Ozone Hole. Ozone (O3) forms under the effect of UV light in the stratosphere. Ozone can also form in the troposphere. Naturally it forms from volcanic activity. It is produced by motor vehicules so it is a pollutant. Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion.