Abstract: An apparatus for purification of air comprising comprises a housing having inlet openings for supplying the air to be cleaned and outlet openings for discharging the cleaned air, a filter system disposed in the housing, and a fan arranged to draw air through the housing and filter system. The filter system includes at least one tubular or bag-shaped fleece filter which is arranged on top of a carrier structure and at least one secondary filter element which has a filter fineness which is smaller than the filter fineness of the fleece filter. The entire apparatus is arranged either stationarily or moveably in regions of greater to lesser dust concentration. The cleaned air is conveyed to the region with the higher local dust concentration and thereby significantly decreases the local dust concentration.