Which gas is released into the atmosphere by the exhaust of supersonic jet planes?

Which one of the following is not a common component of Photochemical smog?

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.

The non-biodegradable waste formed in fertilizer industries is

Which gaseous pollutant,even in low concentrations,causes respiratory distress such as inflammation and irritation in the human respiratory tract?

What is the troposphere?