Does an Air Purifier Have to Be Turned on 24/7?

We recommend keeping your air purifier on whenever you are at home and outdoor PM2.5 is above the WHO annual limit. We did a real life test with the Cannon and the test showed that a strong air purifier can clean the air very quickly, so I would not recommend turning on the purifier when no one is at home. However, after the cannon was turned off, the dirty air outside immediately entered the room, so it is recommended to turn on the purifier while sleeping or whenever someone is at home. Here’s the link to the article:

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