Houseplants Do Not Improve Indoor Air After All, Drexel Study Finds MSN com November 8, 2019 Michael Waring, PhD, an associate professor in the College of Engineering, was featured in Nov. 8 Philadelphia Inquirer, Philly Voice, Air Quality News and Medical Daily stories about his research on potted plants. Related stories also appeared on Nov. 7 in the Minnesota Post, Geek.com, Mental Floss and an MSN.com piece and was picked up by a number of television affiliates across the country. View Story Topical Tags: College of Engineering environmental engineering Share Related