Hello, Happy Saturday. I purchased air purifier from Ebay. It is brand new. The air quality indicator is always blue. I moved air purifier to different part of the house and still shows blue. I even moved it to garage and even outside of the house and still shows blue. I think air quality indicator is malfunctioning. I look forward to hearing from you. Thank you.

Works great. I live next to huge trees and have allergies so this would help me a lot with that.

Liked this unit so much we bought a second one for the 2nd floor.

Great item