Scientists have only begun to study the chemical mechanisms by which the purifiers actually work indoors, says Timothy Bertram, a University of Wisconsin chemist leading a study of bipolar ionizers. Without that understanding, it’s hard to evaluate what, if anything, additive purifiers do when they’re installed inside an air vent or plugged in at the back of a classroom. So far, Bertram’s study has found no evidence of the ionizers reducing aerosols.
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