Houseplants Cut Indoor Ozone (IMAGE) American Society for Horticultural Science Caption Experimental chambers in a Penn State University greenhouse were equipped with a charcoal filtration air supply system to measure ozone depletion rates. Credit Photo by Dennis Decoteau Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.