... formaldehyde ,ammonia gas and acetic acid in air which harmful gas and foreign odor.3. nanometer activity Ionizer‘,control Microbe grow;, ... 2. Advanced noise suppression technology, mute sounds working. 3 Automatic function design, display air quality in the room automatic 4 LED display, working ... G-A38 have humidify function ,keep humidification in the room High quality air purifier manufacturers