The LightningAir can reduce sources of discomfort which contribute to allergies, hay fever and other types of airborne irritation. LightningAir utilizes both negative ions and O3. The purifier not only purifies the air, it also sanitizes the entire room... it has an Ionic Purifier that clears the air of dust, pollen and dander around the clock. But for odors, our unit employs a built-in 03 Sanitizer. Just close off the area to be treated, turn the dial and let the Sanitizer do its work without the use of fragrances.This unit is especially effective in controlling mold and mildew that appears in the warmer months.