That's not actually what Veritasium found. What they found is evidence that there aren't health benefits to the ions themselves, and there are potential harms f

That's not actually what Veritasium found. What they found is evidence that there aren't health benefits to the ions themselves, and there are potential harms from the ozone pollution that many of those generators create. But for air filtration, properly working negative ion generators certainly cause particles to leave the air: https://www.youtube.com/watch?v=y7QFJgTjzcc https://www.youtube.com/watch?v=y7QFJgTjzcc The thing is, that means they end up on surfaces near the ion generator. That isn't necessarily a good thing. Proper HEPA filters are more likely to be what you want, as they remove particles entirely, putting them in a filter that can be disposed of.