Q. Which one of the following chemicals is responsible for the depletion of ozone layer in the atmosphere? (UPSC Prelims 1992)
Answer: Chlorofluorocarbons
Notes: Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).