GL AIR PURIFIER is 7-stage air purification system that removes airborne particulates, allergen, viruses, bacteria, fungi, moulds, bad odour, and volatile organic compounds (VOCs). it uses a HEPA filter as its main base which is complemented with an additional 6 more stages to provide your home or office with clean and safe air every day, the built in PM 2.5 sensor indicator displays the real time quality of the air.