Ionizers are a relatively inexpensive way to clear second hand smoke. However, if you have a problem with dust or pollen an ionizer air purifier may not be the best choice because the particles are not completely eliminated. The main health concern related to ionic air purifiers is the fact that they produce ozone as a byproduct. When ozone is inhaled directly into the lungs, it can pose a health risk. The EPA classifies ozone as a toxic gas that causes lung damage, triggers asthma attacks, and can even lead to increased risk of death. These are all facts that need to be taken into consideration when purchasing the right air purifier.