It is considered that the main source of these halogen atoms in the stratosphere is photodissociation of chlorofluorocarbon (CFC) compounds, commonly called freons. And of bromofluorocarbon compounds known as halons. These compounds are transported into the stratosphere after being emitted at the surface. Both ozone depletion mechanisms strengthened as emission of CFCs and halons increased.
Producing these materials began in the 20-th century, from early twenties. They are used as ideally safe fridge-agents, deodorant fillers, electric equipment cleaners, fire put up material, plant-protecting means. It is considered that the molecules getting in the atmosphere don’t dissolve for decades and reaches the stratosphere, where under the influence of the ultraviolet rays of the sun it dissolves and produces chlorine atoms. These ones work as a catalysts of dissolving ozone molecules. It is thought that one molecule chlorine-fluorine-carbon dissolves 100 thousand ozon molecules. |