espiratory masks for prevention of dehydration of airways for non-medical use for anti-pollution and dust protection and protection from dry air; Respiratory masks for wear on faces, providing personal humidifiers for anti-pollution and dust protection and protection from dry air; respiratory face masks that humidify airways of the respiratory mask wearer using humidity in the wearers' own breath for anti-pollution and dust protection and protection from dry air; Filters for respiratory masks...