The Lightning Air LA-3500 Air Purifier is a negative ion generator and ozone generator. Lightning Air’s unique air treatment process regenerates and restores the dynamic, vital elements of Mother Nature’s freshest air to your home, office, shop and store. The Lightning Air air purifier is effective forCigarette smoke, Smoking odors, Chemical odors and aerosols, Pet Dander, Pollen, Allergens, Air-borne mold, Mildew odors and much, much more! Effective in areas up to 3,500 square feet.