I came across this claim on a currently selling Asus laptop:
My gut reaction is that this is just a marketing gimmick. Is there any way to validate Asus's claims?
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Air Ionizers are commonly used to clean particulates out of the air. However, in looking at this laptop and the language used in the advertising, I think there is a conflagration of two separate goals. The language used in the picture does indeed correspond to what an air ionizer does, however, the size limitations of the laptop may impact its ability to do so. Instead, the more likely scenario is for this part to help protect the laptop itself from particulates, and the language preys on the gullibility of the customer.
This paper states in it's fast track summary regarding asthma (emphasis mine)
No evidence supports use of room air ionizers, homeopathy, or mind-body therapy for the treatment of asthma
So even though an air ionizer will trap electrostatically charged particles, it really has no benefit to people. And that brings up the possibility of uncontrolled ESD in the laptop.