Are negatively charged ions safe for your health?

I am looking into buying the RabitAir BioGS air purifier. From what I heard in the past, I heard that negatively charged ions are bad for your health. Now I am reading that they are actually good for your health and it is Ozone that is bad for your health. The RabiAir BioGS claims that it produces negatively charged ions and does not produce any Ozone at all. This would be a good thing right?