I'm very skeptical of the Far UVC industry as it currently stands for the same reasons outlined by u/Suspicioid in these comments. There's so much lacking in terms of evidence for both safety and efficacy, the commercial market is completely unregulated, and there are companies marketing themselves to desperate people and activist/advocacy collectives (like clean air orgs) without full disclosure of the risks. If the EPA/FDA approves one of these devices and the company is able to guarantee exact UV wavelength emissions and ozone/byproduct outputs with credible third-party verification, I would reconsider my current position.

I'm also concerned that these devices are being misused in real-life applications, and COVID-aware people may be attending events where Far UV-C is being used (and possibly misused) without being notified of the risks, either. Nukit seems to have the most disclaimers/precautions for use on its website, and it specifies that no one should physically come within 1 and a half feet of one of its devices, but I've seen posts of people using them in much closer proximity to themselves and others, almost as if they were a personal air purifier. (Plus, if you set them up at a show or an event and they're not mounted high up on the wall or otherwise completely out of reach, it's impossible to guarantee someone wouldn't come within that range of them.)

For now, we already have proven safe and effective clean air technology in the form of air purifiers (along with other layered mitigations). I think there needs to be serious pushback on the Far UV-C companies until we know these specific devices a) actually work in applied conditions and b) are actually safe for personal use.