Xiaomi Smart Air Purifier 4 adds negative air ionization that you may not need - Hindustan Times

Science continues to debate the need for negative ions in indoor air purification systems, but we find that air cleaning works as well with Xiaomi’s latest air purifier when the ions are turned off

Xiaomi Smart Air Purifier 4 - Xiaomi Global Official

Xiaomi Smart Air Purifier 4 - Xiaomi Global Official

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Xiaomi Smart Air Purifier 4 - Xiaomi Global Official