Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An air ionizer (or negative ion generator) is a device that uses high voltage to ionize (electrically charge) air molecules. Negative ions, or anions, are particles with one or more extra electrons, conferring a net negative charge to the particle. Cations are positive ions missing one or more electrons, resulting in a net positive charge. Most commercial air purifiers are designed to generate negative ions. Another type of air ionizer is the ESD ionizer (balanced ion generator) used to neutralize static charge.

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