I love this air purifier! You can actually see it working. Mine is in my bedroom, which is so helpful to my allergies! If I’m cooking somethin in the kitchen, you can see when the smell of the food reaches my bedroom door. When set on auto, the air quality number drops below 100% (how far it drops depends on the food smell) and the fan turn up and starts cleaning the air. Even with something like burned toast or pop corn, the air is cleaned and the smell is gone very quickly. Where burned popcorn otherwise lasts for hours. I’m very pleased with this product. I would definitely recommend it!