Do air purifiers emit ozone?Updated 7 months ago

Some air purifiers produce ozone. Theres no ozone emission from air purifiers that use only high-efficiency particulate air filters (HEPA filters) to cleanse the air. Ionizing air purifiers may create ozone. Photocatalytic oxidation (PCO) is a form of ionization that can produce ozone. PCO uses a UV light to shine on a photocatalyst surface containing titanium dioxide (Ti02). UV lamps that produce wavelengths below 240nm are capable of producing ozone. So depending on the type of UV light used in the PCO processes, it might produce ozone. The amount of ozone produced is dependent on the type of UV bulb used and the ingredients in the photocatalyst. Manufacturers use these variables to regulate the ozone output of a device. For example, some produce high-output ozone generators for decontaminating water-damaged buildings or for agricultural storage as a way to store produce for longer periods. Manufacturers of residential air purifiers using PCO are encouraged to keep ozone in air purifiers below EPA and OSHA standards.