What does the ionizer in an AC unit and why should I choose air conditioner with ionizer?

Any air conditioning unit has filters that clean the air from dust, odors, microorganisms etc. However, the current needs of comfort and hygiene are leading some manufactures to supply the units with ionizer also. The ionizer is an additional filters currently the one of the most advanced air-cleaning technologies in the world (COLD PLASMA). The Cold Plasma ionizer releases ions, thus it disinfects and diminishes bad smells in the room. Furthermore it gathers house dust, pollen and other small particles that are responsible for allergies. At the same time it generates ions, in order to create a safe, healthy and relaxing environment.