Indoor air pollution is among the top five environmental health risks. Usually the best way to address this risk is to control or eliminate the sources of pollutants and ventilate a home with clean outdoor air. But opportunities for ventilation may be limited by weather conditions or by contaminants in the outdoor air. This document contains a summary of available information about residential air cleaners.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.