Some devices claim to clean the air using chemical reactions or “advanced oxidation”—but not all of them are safe or effective.

• Sorbent filters, like activated carbon, are often used alongside HEPA filters to remove odors, smoke, and chemical gases (VOCs). They’re safe and useful when properly sized and replaced often, but they do fill up over time and lose effectiveness if neglected.
• Photocatalytic Oxidation (PCO) and plasma air cleaners use UV light or charged particles to break down pollutants. However, studies show they can create harmful byproducts like formaldehyde or ozone. There’s not enough real-world data showing these devices improve health outcomes.
• Ozone generators should be completely avoided. Some are sold as air purifiers, but ozone is a known lung irritant—even small amounts can worsen asthma and other respiratory issues. No federal agency has approved ozone generators for use in occupied spaces.

Bottom line? Stick with technologies backed by solid science—like mechanical filtration and sorbents. When in doubt, simpler is often safer and more effective.