I live directly across from a 2.8 Acre Building Construction Project with 4/5 buildings being built. I purchased the Blue Pure 211+ Unit with it's AUTO PARTICLE + CARBON FILTER just before the construction started.  
     I have a breathing condition, which is exasperated by construction. Consumer Reports gave this unit a "5 Star" Review. It was one of its top buying choices for air purifiers. 
   I am very pleased that I took their advice. The unit is able to air purify my entire place. The 1st filter, when I took it out to put in the new Blue Pure 211+ Auto Particle + Carbon Filter was extremely USED UP. 
   I truly appreciate having this Blue Pure 211+ Air Purifier in place & automatically cleaning the air in my place during this construction period. Thanks for reading this message.