When you make your house smell good with air fresheners, wax melts, or diffusers, you’re also polluting the air—and hurting your lungs.

If you do use wax melts, an air purifier can help remove potentially harmful pollutants. They can be pricey, though; If you're up for it, a cheaper option is to build your own Corsi-Rosenthal box ...

The particles eminating from burning scented wax melts indoors can create a “tremendous amount” of indoor air pollution — similar to pollution caused by diesel engines.