File:Future ozone layer concentrations.jpg
NASA projection of stratospheric ozone, in Dobson units, if chlorofluorocarbons had not been banned.

Chlorofluorocarbons (CFC) are gases used for various purposes including solvents,refrigerants and aerosol sprays. They are organic chemicals and contain carbon, (sometimes hydrogen,) chlorine, and fluorine. They were much used in the middle 20th century, replacing chemicals that were toxic or flammable or had other problems. In 1978, Sweden became the first country that banned CFC products. Later, the US and Canada did the same. Now, CFC products are not allowed in most countries, because they cause ozone depletion. CFCs also are greenhouse gases. An alternative is hydrofluorocarbons (HFCs). These do not destroy the ozone layer or increase global warming.[1][2]

Related pages


  1. John M. Broder (November 9, 2010). "A novel tactic in climate fight". The New York Times. p. A9. Retrieved 2013-02-05.
  2. M. Rossberg et al. Chlorinated hydrocarbons in Ullmann's Encyclopedia of Industrial Chemistry 2006, Wiley-VCH, Weinheim. doi:10.1002/14356007.a06_233.pub2
File:Ozone cfc trends.png
Ozone-depleting gas trends