When you hear or see the words 'air pollution,' you most likely think of things like factories and car exhaust. That's pollution that is out there – outside your house. But have you thought about how you're contributing to air pollution inside of where you live by using seemingly innocuous products like scented, non-combustible candles?

New research by Purdue University, the latest in a series of Purdue-led studies, examined how scented products – in this case, flame-free candles – are a significant source of nanosized particles small enough to get deep into your lungs, posing a potential risk to respiratory health