The Lasko 2554 is a ceramic tower heater with a built-in fan, and it does not emit ozone. Ozone is a type of gas that can be harmful to human health if inhaled in large quantities. It's often produced by electrical appliances such as air purifiers, but it's not a byproduct of heating or cooling devices like the Lasko 2554. However, it's always a good idea to check the product specifications and any safety certifications before purchasing any appliance.