The highest quantity present in the atmosphere is of

Chlorine atoms act as catalysts in the depletion of the ozone layer in the Earth's atmosphere. These chlorine atoms originate from which of the following?

Global warming is due to an increase of:

How is $SO_2$ an air pollutant?

Air pollution that occurs in sunlight is:

Match the items in List-$I$ with the items in List-$II$ and select the correct answer from the given options:

List-$I$	List-$II$
$A$. Bleaching of paper	$I$. $CF_2Cl_2$
$B$. Eye irritant	$II$. $H_2O_2$
$C$. Freons	$III$. $Na_2AsO_3$
$D$. Herbicide	$IV$. $PAN$
	$V$. $CO_2$