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Anything airborne that is now living, was once living, or was produced by something alive, and has the capacity to create negative health effects, is considered to be a biological contaminant. Therefore, bacteria, viruses, dust-mite body fragments and feces, mold, mildew, and pollen are all biological contaminants. These particular biological contaminants are in particulate form (tiny bits of solid matter). However, most metabolic processes also release a variety of gases including volatile organic compounds (VOCs). These, too, are biological contaminants, but in a non-particulate, gaseous form.
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Air purifiers that remove both particulate and gaseous contaminants require both a physical type of filter medium such as HEPA to remove fine particles and an adsorbtion type of medium such as activated charcoal.
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