Abstract: A portable air purifier system and apparatus which includes a multi-element filter pack that is replaceable as a single unit, thus facilitating health safety of maintenance personnel. By serially disposing filter elements in order of descending sizes of particulates, filtering is improved. Selectably includable within the filters are materials that are particularly efficacious in removing contaminants such as acetone, ammonia, ozone, carbon monoxide, carbon dioxide, ethanol, methane, ethane, methanol, formaldehyde, hydrogen sulfide and other hazardous substances. By including an ultra-violet light source directed onto an activated charcoal layer, germicidal action is facilitated, and noise is abated through the advantageous employment of an expanded plenum and multiple right angle bends in air passageways.