Air purifiers prevent the pollutants from indoor environments. These devices are good at increasing indoor air quality. Ionizer air purifiers are 
strategically standard air purifiers. These are well efficient at keeping indoor air conditions healthy.
Ionizer air purifiers work using an unique technology to maintain indoor air quality. These devices control the pollutants in the air by releasing negative ions which attract the airborne particulates. These systems generate high voltage to generate negative ions which attract the pollutants by themselves. In this system, positive charged plates or needles attract the pollutants to maintain the environments healthy. Cleaning of needle and plates is very important.
Ionizer air purifiers with the help of ionizing process prevent tiny microbes also. Electrostatic precipitation process is used to prevent the pollutants in the air. These processes do not require fans. But then some devices come with fans which have the more purifying efficiencies. These devices reduce the allergens and pollutants present in the air to prevent the allergic infections.
Ionizer air purifiers are mechanically standard with air purification techniques, which improve the indoor air quality.
Additional Resources:
Centrifugal Blowers and Fans