A little over a year ago I purchased two of these air filters for my home to help with wildfires & temperature inversion smog bubbles, and to provide some reassurance having friends over during the pandemic. We've found them tremendously helpful with these more severe issues, as well as with everyday odors and my pollen & dander allergies. While the 'high' setting is rather loud, it clears out a room surprisingly fast, and the 'low' and 'medium' settings are quiet enough sometimes we can't even tell the purifier is running. All in all they're a good purifier for the price!