Question

In $2002$AD, CFC concentration of atmosphere was.

• A. $261$ ppt
• B. $326$ ppb
• C. $1750$ ppb
• D. $368$ ppm

Answer 1

The correct option is A $261$ ppt

• When ultraviolet light waves (UV) strike CFC* ($CFC{l}_3$) molecules in the upper atmosphere, a carbon-chlorine bond breaks, producing a chlorine (Cl) atom. The chlorine atom then reacts with ozone ($O_3$) molecule breaking it apart and so destroying the ozone layer.
• Ozone depletion is a major environmental problem because it results in the increase in the amount of ultraviolet (UV) radiation that reaches Earth's surface, which increases the rate of skin cancer, eye cataracts, and genetic and immune system damage
  
• In 2002AD, CFC concentration of atmosphere was 261 ppt.
  
• So, the correct answer is '261 ppt'.