Air ionizer for rooms

In an air ionizer useful for distributing negative ions in enclosed spaces in buildings, the air ionizer including a housing which has an air inlet opening and an air outlet opening, a fan located within the housing to suck environmental air into the housing through the air inlet opening and thereafter blow the air out of the housing through the air outlet opening, a number of negative ion-producing electrodes positioned in the housing for producing negative ions in the air therein, and a high-voltage generator electrically connected to the negative ion-producing electrodes, the improvement wherein a mounting plate which includes a multiplicity of individually adjustable ball nozzles is positioned over the air outlet opening, each of the ball nozzles being rotatable to determine in what direction the air with negative ions passing therethrough will flow.