Negative air ions explained
When they join then, this creates a negatively charged oxygen molecule while the electron is attached. A microscopic film of water surrounding that Oxygen molecule will prevent the electron from leaving.
This creates a permanently negative charged Oxygen molecule, that we call NAI.
Naturally, there is a linear relationship between negative air ions and static. More negative air ions are more effective in cleaning and refreshing air. However, static will be more active at the same time. Avoid touching the plants when you are using a Plant Ionizer.