Besides HEPA filter technology, some of the other most popular air purifiers are the Ionizer, UV and Electrostatic air cleaners.
Ionizers rely on negative ions to neutralize harmful particles, while UV air cleaners utilize UVC wavelength to produce UV rays that protect us from germs and viruses. However, there are also air cleaners that utilize ESP to electrically charge the air. This creates ionized particles and neutralizes harmful pollutants in the air. Whatever your choice may be, you’re going to have a vast variety to choose from!