You should ideally leave your air purifier running continuously, 24 hours a day, 7 days a week, to maintain a consistently clean and healthy indoor environment. Indoor air is constantly reintroduced to new microscopic pollutants, dust mites, pet dander, and cooking fumes from everyday household activities, meaning that turning the purifier off allows particulate concentrations to rebound rapidly. Modern air purifiers feature highly energy-efficient motors designed for continuous operation without generating excessive power bills. If running it constantly is not preferred, you should at least operate it on high speed for an hour before spending time in the room or keep it running whenever allergy sufferers are present.
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