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 by running a purifier in a bedroom set on a timer to turn on every day for two hours and then off again. The tests showed two things:
- The air got clean quickly. This suggests it’s OK to turn your air purifier on when you get home. You don’t have to leave it on while you’re away.
- After turning off, the air got dirty again very quickly. That’s despite the fact that the doors and windows were closed. Outdoor air is constantly getting into our homes, even though we can’t see it. So we recommend keeping your purifier on while sleeping or whenever someone is at home.
You can read more about the test here: https://smartairfilters.com/en/blog/do-you-have-to-run-your-purifier-all-day/
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