What happens when air purifier is left off

Leaving the air purifier off in Shanghai has consequences.

Well, I will need to keep at least one of my air purifiers on on bad air days. These readings surprise me. We are unsure where the bad air enters our apartments still.

Yes, without an air purifier, your home’s AQI will be higher than the outside AQI.

AQI very high in Shanghai apartment
AQI very high in Shanghai apartment

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