Cataract and skin cancer are caused by

The stratosphere extends from sea level up to an altitude of $...$ kilometers.

The gaseous envelope around the earth is known as the atmosphere. The lowest layer of this extends up to $10 \ km$ from sea level; this layer is $.......$

Which of the following is a sink for $CO$?

Observe the following statements:
Statement-$I$: The carbon-containing components of photochemical smog are acrolein,methanal,and $PAN$.
Statement-$II$: The number of greenhouse gases in the list given below is $5$: $CH_4, CO_2, NO, H_2O_{(l)}, H_2O_{(g)}, O_2, O_3$.
The correct answer is:

The reaction of $.....$ with $O_3$ leads to a decrease in the concentration of ozone by approximately $40\%$.