A scrubber in the exhaust of a chemical industrial plant removes
(a) Gases like sulphur dioxide
(b) Particulate matter of the size 5 micrometer or above
(c) Gases like ozone and methane
(d) Particulate matter of the size 2.5 micrometer or less
(a) Scrubber is an electrostatic precipitator in which the dirty air is cleaned by capturing the gas like SO2 and other oxides in water/lime spray.