Abstract: A measured amount of fibrous material, preferably in the form of a rolled up strip, is placed in each nostril to aid the cilia of the nose in their filtering function for the air entering the lungs. The aid thus given the nasal cilia can improve their filtering function by more than 100%, and become a substantial factor in preventing or curing all kinds of respiratory disease in a polluted environment. The fit of the appliance and the amount of filtration can be controlled by the length and thickness of the strip.