I use this in my bedroom for a good week, and I noticed that the air quality seemed fresher or more clean. I will continue to use this product because I feel that I sleep better at night and I don't have any of the morning allergies when I wake up. Before putting this air purifier in my room I would wake up sneezing etc. I did receive this air purifier as part of a free promotion to try it out, but my review is not biased based on that.