You have to admit, there is something sweet and crisp in the air of a home that’s filled to the brim with flora. It’s clean, chemical-free oxygen! And it’s the doing of all those lush, overgrown plants you’ve finally managed to keep alive. They’re pretty and functional—who knew? The Sill, New York’s plant oasis, did, which is why we asked one of their resident experts, Erin Marino, to give us the dirty details on the plants that do the best job at cleaning. Hint: all of them.

“When NASA needed a cheap, easy way to filter the air on space stations, they chose the most common houseplants at the time to test,” explains Marino. “Reporters then wrote about the NASA study, but misinterpreted it as ‘these are the only plants that filter the air’ instead of ‘all plants filter the air, but these are the only plants NASA had the time and budget to test’! Here at The Sill, we encourage you to bring all different varieties of plants into your living spaces to improve air quality.”

Herein are six plants they love: