How potent home air purifiers are at killing viruses with UV radiation depends on the dose of radiation and the length of time the germs are exposed to the radiation as they pass through the purifier:
The dose of UV-C radiation in home air purifiers is unlikely to be sufficient to inactivate viruses and bacteria in a single pass through the air purifier lasting a few seconds.
What would be needed is a device specifically developed for air disinfection with UV-C. Such devices are available in professional use, e.g. in the USA. Such devices are in professional use, e.g. in hospitals, and are correspondingly expensive.
The UV-C radiation of air purifiers for home use ionises the air stream (in the same way as electrical ionisation) and primarily serves to eliminate odours. The safe removal of viruses from the ambient air is ensured primarily by HEPA filters H13 (or better H14).
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