Abstract: The apparatus is formed of a centrifugal force and Coriolis force generating device and a gas and liquid separation device. The centrifugal force and Coriolis force generating device gives high energy to supplied liquid by generating a spirally flowing air stream therein, to thereby ion-dissciate the liquid. Also, it provides energy necessary to micronize and activates the liquid drops with the centrifugal force and Coriolis force acted in the spirally flowing air stream. The activated liquid drops ionize oxygen particles at the gaseous side when electric doublets is oriented on the surface of the liquid drops, thereby causing groups of negative ions to be generated. The gas and liquid separation device separates the gas and liquid sent out from the centrifugal force and Coriolis force generating device and discharges air including negative ions into the atmosphere.