It is best to use it when someone is around. Under normal circumstances, the air purifier can significantly reduce the PM2.5 levels in the house within 10 minutes. However, pollution levels rise quickly after turning the purifier off. We recommend the purifier to be in use when someone is around and turned off when no one is around. For more test data, read it here: https://smartairfilters.com/en/blog/test-can-you-turn-off-your-purifier-when-you-sleep/
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