Air ionization occurs during thunderstorms, in waterfalls, and when waves crash on the beach, releasing large amounts of positive and negative ions into the air. The Aaira + HEPA uses Plasmashield technology to bring this natural process into your home and pairs it with a H13 True HEPA Filter for complete air purification. There are two plasma ionization points within the device. The first sends out ions into the room, actively attacking airborne germs. The second is located around the HEPA filter, killing what is captured. That’s two levels of plasma protection for complete peace of mind.