$NO_2$ and $O_3$ react with unburnt hydrocarbons in polluted air to form .....

The primary pollutant that leads to photochemical smog is

The pollutants which come directly into the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

Fish die in water bodies polluted by sewage due to

Some gases are responsible for the heating of the atmosphere (greenhouse effect). Identify from the following the gaseous species which does not cause it.

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