Some air purifiers directly use ozone to remove pollutants from the air while others may create ozone as an unintentional byproduct. In both cases, this is precisely the type of ozone that you will get warnings about in the weather report – while the ozone layer is a good thing, when it is in breathing range, it is a pollutant that should be avoided! The EPA tells us that “relatively low amounts can cause chest pain, coughing, shortness of breath, and, throat irritation. Ozone may also worsen chronic respiratory diseases such as asthma and compromise the ability of the body to fight respiratory infections.”
If you have an air purifier, don’t fret. Check out these two lists right now from the California state EPA to get a list of approved air purifiers. If yours isn’t on there, check their list of Potentially Hazardous air purifiers. If your air purifier ends up on the unhappy list of high ozone producers, I strongly recommend you responsibly dispose of it and find your self one from the good list.