We all know that having indoor plants can instantly spruce up your home aesthetic, but greenery can have other benefits beyond looking great. In an often-cited 1989 study, NASA reported that indoor plants could help improve indoor air quality by removing trace organic pollutants — such as benzene, trichloroethylene, and formaldehyde — from the air. NASA’s experiments were done in a controlled, sealed chamber, which doesn’t reflect our real-life homes. So in reality, you would probably need more than a crazy-plant-lady amount of plants to make much of a difference in air quality, but it certainly can’t hurt to have a few extra around. (Plus, other studies have shown that indoor plants can also help reduce stress levels or attention capacity).