The Electrolux Oxygen Z9124 is one of the lowest decibel air purifiers available to purchase. It emits 27 decibels while being operated on quiet mode. The Electrolux Oxygen uses a high efficiency particulate air filter, or HEPA filter, combined with an active carbon filter to remove indoor air pollutants.
Another leading low-decibel air purifier is the Airgle 750. Its brushless direct-current motor, or BLDC, operates at five speeds. On its lowest setting, it produces 23 decibels. Its light sensor switches the purifier to silent mode when the room is dark. This is ideal for bedrooms and living rooms.
The Rabbit Air BioGS SPA-421A purifier has a motor that offers five speed settings. Sound emissions are 18 decibels on its lowest setting. It emits zero ozone, making it safe for asthma and allergy sufferers.