A method for removing gas components SOx, NOx, and CO2 from a flue gas, comprises the steps of contacting the flue gas successively with first, second and third liquid mediums each of which provides a plasma containing reactive electrons or ions in an amount such that the gas molecules SOx, NOx, and CO2 are successively subjected to impingement of the electrons or ions in the respective plasma to enable the dissociation of the gas molecules SOx, NOx, and CO2 so as to remove SOx, NOx, and CO2 from the flue gas. A system for removing gas components SOx, NOx, and CO2 from a flue gas is also disclosed.