A majority of studies analyzing indoor air cleaning tech such as HEPA filters, ionizers, and advanced ventilation systems have not been tested in real-world circumstances, thus raising questions about their efficacy, according to an Aug. 5 review published in the Annals of Internal Medicine.
Air cleaning technology claims to reduce the transmission of infectious microbes in indoor settings. In the review, researchers looked at 672 studies published between 1929 and 2024 that analyzed equipment used for this purpose.
