I don’t have any device to measure air quality but it seems to have made the air quality a lot better. I face long commutes, about 2 hours a day and I used to have a terrible dust allergy. Since using this air purifier it’s gotten much better. So I guess it works. Besides it is a steal at such great price with HEPA advanced technology.I was tired of spending a lot and getting no effects in return finally got soemthing which can actually work. Its very handy I keep it near my bed, its safe durable for sure. Style and design is preety simple. I would surely recommend having one to keep you and your family healthy.