The gold standard simple room air purifiers currently in the U.S.A. are HEPA based air cleaners. This is because HEPA filters remove airborne particles up to .003 microns at about 99.97% efficiency. When other technologies such as activated carbon, UV, and yes, ionization, are added, it can increase the kill and elimination rate of harmful air pollutants, bacteria, viruses, volatile organic compounds, dust, dander, smoke, smells and other unpleasant visitors in your personal atmosphere. 

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