Abstract: An apparatus and method for treating air and surfaces for sanitizing or other cleaning purposes. Air can be filtered and/or treated with UV illumination, and surfaces can be treated with UV illumination, e.g., to oxidize contaminants. Doors on an apparatus housing can be moved from a closed position, in which UV illumination cannot exit the housing, to an open position in which UV illumination can exit the housing to treat nearby surfaces. The doors can be retracted within the housing, and/or can impede air flow along an air path to filters in the housing. Opening of the doors can expose an air flow path through the door opening and to filters.