This air purifier has been a lifesaver for us.  We had a flood in our basement and wanted to have peace of mind that no mold would be in the air as a result from the flooding. It is very comforting right now with 
 Covid 19, not being exposed to mold.  When we first turned it on, the light was on the Amber color only for about 5 minutes then changed to blue which is good air quality.  It is super quiet. Thank you to the previous reviewers who helped with my decision.