Quiet on night mode and relatively calm on first. You can sleep and not notice (it is 1 m from the bed) But the modes further - noisy. But, I do not put above the night mode at all. Alternately with a humidifier (through scenarios) that the one that the other at the minimum changes each other and keeps both the humidity optimal and minimal pollution (well, if you believe the performance of the purifier;) )
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