Which of the following is not an air pollutant?

The harmful effect of air pollution on organisms depends on:

Which pollution deleteriously and directly affects the respiratory system?

Consider the following statements about a scrubber:
$I.$ It is used to remove gases like sulphur dioxide from industrial exhaust.
$II.$ In a scrubber,the exhaust is passed through a spray of water or lime.
$III.$ Water dissolves gases and lime reacts with sulphur dioxide to form a precipitate of calcium sulphate or calcium sulphide.
Which of the statements given above are correct?

What percentage of particulate matter released from thermal power plants is removed by an electrostatic precipitator (in $\%$)?

Photochemical smog is related to the pollution of