The device which can remove particulate matter present in the exhaust from a thermal power plant is:

What efforts were made to reduce air pollution caused by vehicles in Delhi? Has the air quality in Delhi improved?

Which of the following pollutants can be 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?

Which of the following is generally not considered an air pollutant?

The Air (Prevention and Control of Pollution) Act came into force in: