I bought this Blueair purifier because a family member with severe animal allergies was coming to visit for 2 weeks and we have 7 cats & dogs. We also live in the desert and have considerable dust that sneaks into the house.  I am happy to report that dander allergies were kept to a minimum and the dust on countertops and other surfaces was dramatically reduced.  I ordered a second one a few days after receiving the first. these purifiers have made an incredible difference in our indoor air quality!