There is a need of the solution of two inconsistent tasks connected with features of technical characteristics assignment when using electrical corona air ionizers for correction of air ion composition. On the one hand, for providing sufficient generating ability of the air ionizer the increasing of corona voltage is necessary. On the other hand, increase of the corona voltage leads to increasing in generation of concomitant harmful chemical compounds. Results of research of small air ion concentration and volume concentration of ozone O3, nitrogen oxide NO and nitrogen oxides (in terms of NO2) are presented. The received empirical dependences allow to carry out calculating of change of foregoing above characteristics for formed air ion composition.