Air purifiers can’t fully eliminate indoor air pollutants, but they can help with the process of cleaning indoor air and come with little to no risk, experts say.

“I wouldn’t think of an air purifier as the one thing I’m going to do to address indoor air pollution,” said Dr. Elizabeth Matsui, a pediatric allergist and director of the Center for Health and Environment: Education and Research at The University of Texas at Austin’s Dell Medical School. However, “you are certainly not harming anything by using them, even if you your home has low levels of air pollution, and you are very likely to be helping promote the health of yourself and your family members.”

Humans spend the vast majority of their time – about 90% – indoors, and the quality of indoor air is often many times worse than the air outdoors.