There are several levels of air cleaning. We clean it from visible, barely visible and from microscopic impurities. We clean due to dust, allergens or, very actual this year, we are disinfecting against viruses and bacteria. And the size really matters.
Usually people get an air sterilizer when they need to protect themselves and reduce the risk of transmission of for example COVID-19; but also the flu or a bacterial infection. The purpose of this device is therefore to eliminate these microorganisms found in the air. A variety of sterilizers, also called germicidal emitters or cleaners, are available on the market.