What pollutant is primarily removed by a scrubber?

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?

Air pollution effects are usually found on

Which of the following measures has been taken by the Government of India to control air pollution?

Which of the following measures have been taken by the Government of India to control air pollution?

In almost all Indian metropolitan cities like Delhi,the major atmospheric pollutant$(s)$ is/are