About Mold - molds exist everywhere in nature and are a common component of dust. Mold is a microscopic fungi that requires a food source (ie wallpaper, drywall, etc) and a certain level of moisture or humidity to grow. Mold spreads through the air and can create very serious health issues. An air purifier will not remove the source of mold but they can help to significantly clean the mold from the air so you can breathe and feel better. HEPA air purifiers are commonly used by mold remediation specialists in the cleanup of toxic mold to capture airborne mold spores. To address the source of the mold issue you may want to use an air conditioner or dehumidifier to lower the humidity level to 35% to 50% to slow down or stop the spread of the mold fungi. If you have a moisture problem, you should address it quickly and remove any visible mold. Consult a specialist if the area is large or you are unsure how to solve the problem.