On which bases can non-viable particulates be classified?

What do you mean by ozone hole? What are its consequences?

Which of the following organs is damaged by pollutants like $SO_2$,$CO$,and $NO_2$?

Two statements are given below.
Statement-$I$: In dry cleaning,the solvent $Cl_2C=CCl_2$ was earlier used and now it is replaced by liquified $CO_2$.
Statement-$II$: In bleaching of paper,$H_2O_2$ was used earlier and now it is replaced by chlorine gas.
Correct answer is

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Sulphate $(> 500 \ ppm)$	$I$. Methemoglobinemia
$B$. Nitrate $(> 50 \ ppm)$	$II$. Brown mottling of teeth
$C$. Lead $(> 50 \ ppb)$	$III$. Laxative effect
$D$. Fluoride $(> 2 \ ppm)$	$IV$. Kidney damage

Choose the correct answer from the options given below.

Which of the following is not a greenhouse gas?