In 1989, NASA had a very practical problem: the air inside sealed space stations. Their solution was surprisingly low-tech — houseplants. The famous NASA Clean Air Study found that certain common indoor plants absorb airborne chemicals like benzene, formaldehyde and trichloroethylene through their leaves and roots. Now, the honest fine print: your living room is not a sealed space capsule, and you'd need a small jungle to match a purifier. But plants do measurably help, they humidify dry air, and they make rooms feel alive in a way no gadget does. These seven earned their spot by being both effective in the studies and very forgiving of the rest of us.
1. Snake Plant (Dracaena trifasciata)
The plant that thrives on neglect, and the first one NASA's researchers reached for. Snake plants absorb formaldehyde, benzene and xylene, and they do something almost no other houseplant does: they release oxygen at night. Most plants photosynthesize by day and rest after dark; the snake plant's CAM metabolism keeps working the night shift, which is why it's the classic bedroom recommendation. Water it every two to three weeks, keep it out of soggy soil, and it will outlive your sofa. Overwatering is the only reliable way to kill one.
2. Golden Pothos (Epipremnum aureum)
If you can keep a glass of water full, you can keep a pothos. This trailing vine was a strong performer in the NASA study against formaldehyde, benzene and carbon monoxide, and it grows in water, in soil, in bright light or in the dim corner nobody else wants. Cut a stem, drop it in a jar, and it roots — meaning one plant becomes five for free. One caution shared by several plants on this list: pothos leaves are toxic if eaten, so keep it on high shelves away from curious pets and toddlers.
3. Peace Lily (Spathiphyllum)
The overachiever of the NASA list: peace lilies scored against the widest range of pollutants tested — benzene, formaldehyde, trichloroethylene, xylene and ammonia. They're also the most dramatic plant you will ever own. When thirsty, a peace lily wilts like it's performing a tragedy; water it, and within hours it stands up again as if nothing happened. That built-in water gauge makes it nearly foolproof. It likes indirect light and consistently moist soil, and it rewards you with elegant white blooms. Also toxic if eaten — admire, don't snack.
4. Spider Plant (Chlorophytum comosum)
NASA found spider plants removed up to 95 percent of formaldehyde from a sealed chamber in 24 hours — one of the strongest results in the study. They're also the friendliest plant on this list: non-toxic to pets, tolerant of irregular watering, and generous with free babies. Those little plantlets dangling from arching stems can be snipped and potted into new plants, which is how one spider plant quietly becomes a household dynasty. Hang it in a basket and let it do its fountain impression.
5. Boston Fern (Nephrolepis exaltata)
The Boston fern was the study's best performer against formaldehyde, and it doubles as a natural humidifier — a real gift in winter, when heating turns indoor air desert-dry and your skin and sinuses notice. Ferns ask for more than the others here: consistent moisture, regular misting, and indirect light. In exchange, you get that lush Victorian-parlor look and a plant actively working on both air quality and humidity. Hang it in a steamy bathroom and it will think it lives in a rainforest spa.
6. Aloe Vera
Yes, the same aloe you keep for sunburns. Aloe earned its NASA mention for clearing formaldehyde and benzene — chemicals that sneak in from paints, varnishes and cleaning products. As a succulent, it wants the opposite of the fern: bright light and a good soak only when the soil is thoroughly dry. Its fleshy leaves store water, so it forgives vacation weeks without complaint. Keep one on a sunny kitchen windowsill and it doubles as a first-aid kit: snip a leaf, and the gel inside soothes minor burns and sunburn on the spot.
7. English Ivy (Hedera helix)
English ivy was the study's standout for airborne mold particles — in one experiment it reduced fecal-matter particles and airborne mold significantly in closed containers — and it also handles benzene and formaldehyde. It climbs, it trails, it fills awkward spaces with classic green. Ivy is happier slightly root-bound and slightly dry than wet, and it prefers cooler rooms. It's another one to keep away from pets, but for a bathroom shelf or a high bookcase where nothing else grows, it's the elegant workhorse.
Space-station science, windowsill effort. Start with the snake plant if your track record with plants is tragic — work up to the fern when you're feeling brave. Which one is coming home with you first? Tell us in the comments!
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