An air filtering and treatment apparatus , the apparatus including: a housing having an air inlet , an air outlet , an air passageway between the inlet and outlet, and a fan arranged to urge air through the air passageway between the air inlet and the air outlet , wherein the housing includes a filter arranged to filter air passing through the air passageway and a receptacle located toward the air outlet relative to the filter , wherein the receptacle is adapted to hold a treatment composition such that an evaporable vapour associated with the treatment composition is able to accumulate in a headspace of the receptacle , the receptacle including at least one aperture located at a side thereof laterally of the headspace and in fluid communication with the headspace , and wherein at least a portion of the air passageway is shaped such that air flows perpendicularly past the at least one aperture of the receptacle such that an amount of the evaporable vapour from the headspace is entrained into the filtered air released from the air outlet , characterised in that the receptacle includes a lid removeably securable thereto, and that the receptacle is adapted to receive a removable cartridge containing the treatment composition, the cartridge having a removable lid 2. so as to allow fluid communication between the treatment composition and the least one aperture , the lid being securable over the removable cartridge ; and the fan is controllable via a controller , wherein the housing includes a particle sensor and a conduit to communicate environmental air with the particle sensor , the particle sensor being in communication with the controller such that the fan is controllable in response to a particle level detected by the particle sensor . a housing having an air inlet , an air outlet , an air passageway between the inlet and outlet, and a fan arranged to urge air through the air passageway between the air inlet and the air outlet , wherein the housing includes a filter arranged to filter air passing through the air passageway and a receptacle located toward the air outlet relative to the filter , wherein the receptacle is adapted to hold a treatment composition such that an evaporable vapour associated with the treatment composition is able to accumulate in a headspace of the receptacle , the receptacle including at least one aperture located at a side thereof laterally of the headspace and in fluid communication with the headspace , and wherein at least a portion of the air passageway is shaped such that air flows perpendicularly past the at least one aperture of the receptacle such that an amount of the evaporable vapour from the headspace is entrained into the filtered air released from the air outlet , characterised in that the receptacle includes a lid removeably securable thereto, and that the receptacle is adapted to receive a removable cartridge containing the treatment composition, the cartridge having a removable lid 2. so as to allow fluid communication between the treatment composition and the least one aperture , the lid being securable over the removable cartridge ; and the fan is controllable via a controller , wherein the housing includes a particle sensor and a conduit to communicate environmental air with the particle sensor , the particle sensor being in communication with the controller such that the fan is controllable in response to a particle level detected by the particle sensor . <EOS>