I was stuck with fires for two weeks around where I live and it was hard to breath even after they were under control. Got my Alen BreatheSart FIT50 HEPA Air Purifier and within hours the air in my place was breathable again. I love the auto feature so I can simply leave it on and trust that I'm not overdoing (or undergoing) it and at night I just touch the Start button and all the lights go out for a peaceful sleep! The unit is quiet and I am happy!