We’ve only had this purifier a few weeks but I’ve noticed a significant reduction in dust in the house. When my daughter would have the worst poopy diaper ever I’d have to light a candle to get rid of the smell. Now I don’t have to worry about it. You can’t tell we have two dogs in the house and my son is sleeping better during pollen season in Georgia than he has slept in months. So thankful we bit the bullet and got these!