In the late 1980s, NASA was looking for ways to purify the air in its space stations. They conducted a study to find the best plants for filtering toxins and converting carbon dioxide into oxygen.
In 1989, their results were published in a clean air study that provided a definitive list of plants that are the most effective at cleaning indoor air.
Which plants made the list?
NASA's study recommended placing at least one plant for every 100 square feet of indoor space, whether at home or in the office. These are the plants that proved most effective.
1. Dwarf Date Palm

2. Boston Fern

3. Kimberly Queen Fern

4. Spider Plant

5. Chinese Evergreen

6. Bamboo Palm

7. Weeping Fig

8. Devil's Ivy

9. Flamingo Lily

10. Lilyturf

11. Broadleaf Lady Palm

12. Barberton Daisy

13. Cornstalk Dracena

14. English Ivy

15. Varigated Snake Plant

16. Red-Edged Dracaena

17. Peace Lily

18. Florist's Chrysanthemum

What’s in our air?
NASA’s interest in air-purifying plants wasn’t just a matter of aesthetics. The air inside space stations—and even many homes—is often laced with invisible chemicals that can pose serious health risks when inhaled in high concentrations.
Trichloroethylene – Found in printing inks, paints, lacquers, varnishes, adhesives, and paint removers. Symptoms associated with short-term exposure include: excitement, dizziness, headache, nausea, and vomiting, followed by drowsiness and coma.
Formaldehyde – Found in paper bags, waxed papers, facial tissues, paper towels, plywood paneling, and synthetic fabrics. Symptoms associated with short-term exposure include: irritation to the nose, mouth, and throat, and in severe cases, swelling of the larynx and lungs.
Benzene – Used to make plastics, resins, lubricants, detergents, and drugs. Also found in tobacco smoke, glue, and furniture wax. Symptoms associated with short-term exposure include: irritation to eyes, drowsiness, dizziness, headache, increased heart rate, confusion, and in some cases can result in unconsciousness.
Xylene – Found in rubber, leather, tobacco smoke, and vehicle exhaust. Symptoms associated with short-term exposure include: irritation to the mouth and throat, dizziness, headache, confusion, heart problems, liver and kidney damage, and coma.
Ammonia – Found in window cleaners, floor waxes, smelling salts, and fertilizers. Symptoms associated with short-term exposure include eye irritation, coughing, and a sore throat.
So whether you're looking to freshen up your home, boost your indoor air quality, or simply add a little life to your space, NASA’s list offers a natural, low-maintenance solution. Just remember to choose pet-safe options if you share your space with furry companions. A few well-placed plants won’t just liven up a room—they might also help you breathe a little easier.
This article originally appeared last year.


















Winter weather. 

In the past two years, two malaria vaccines have become available for babies starting at 5 months of age.
By exploiting vulnerabilities in the malaria parasite’s defense system, researchers hope to develop a treatment that blocks the parasite from entering cells.
Created with 
Tasks that stretch your brain just beyond its comfort zone, such as knitting and crocheting, can improve cognitive abilities over your lifespan – and doing them in a group setting brings an additional bonus for overall health.
Overdoing any task, whether it be weight training or sitting at the computer for too long, can overtax the muscles as well as the brain.

Amoxicillin is a commonly prescribed broad-spectrum antibiotic.
Chart: The Conversation, CC-BY-ND
Counterintuitively, social media can make you feel more bored and lonely.
Talking about what you’ve read can add a social dimension to what can be a solitary activity.