From personal experience I was convinced that an air purifier in this class made a noticeable difference. I've used it in a 100 square foot room so far and it cleared the air quickly, then settled and felt clean. It was easy to set up in less than 15 minutes, and the controls are easy to master, which I probably won't change often. I can only describe how the air got softer which I think means my allergies have pretty much subsided. It also removes kitchen and other odors that get into my room. The filter catches particles as small as 0.3 microns, about the size of a virus. I don't know UV. It won't hurt, but I think it takes more than a few seconds for UV to sterilize things. A catalytic PCO filter sounds like an improvement over a single UV filter. I guess as it keeps circulating it's gradually reducing the amount of what's in the air.
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