Automatic air cleaners
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— it is an automatic mode, in which the purifier independently monitors the purity of the air, turning on when pollution is detected and turning off after they are removed. In relatively simple models, only on/off is provided, more advanced ones are also able to regulate the intensity of work depending on the level of pollution. Anyway, this function relieves the user of the need to turn on the cleaner manually. In addition, the device's sensors are sometimes more sensitive than a person's nose and recognize contamination much earlier than the user himself would.