Took me a while to find the right air purifier to get. I liked this one cause I saw this tested and saw great results. I was in between dyson and this but it’s too pricey for me so I opted with blueair since I already saw actual results online. It was done by CNN Canada I believe. But yeah so far so good air’s better at night. I tend to get allergies and nocturnal asthma so I can smell the difference when I turn it off and when I leave it.