... smoke etc, as small as 1 micron circulated in the air. FeatureHigh electrostatic plate traps the dust, pollen, smoke ... etc, as small as 1 micron circulated in the air.Easy maintenance: just wipe the dirt down from the ... high-density negative ions to purify the surrounding air-------Negative ions eliminate air borne contaminates such as dust ,pollen ,mold ... (cm)47*56*37.5(20pcs/ctn) air ionizer purifier