🌿 Air quality
🔬 Science
💚 Well-being
🏠 Indoor
🔬 In brief — quick answer
Yes, plants really improve indoor air quality — but not magically. Their concrete and measurable benefits: humidity regulation (+5–10%), CO2 reduction, absorption of certain VOCs, and significant well-being improvement. The effect depends on the number of plants, their placement, and care.
Do indoor plants really purify the air? Between the 1989 NASA study and the latest research, here’s what science really says — and how to make the most of it at home.
What science really says: decoding the studies
The 1989 NASA study: real results, a specific context
The original NASA study showed that some plants do absorb pollutants like formaldehyde, benzene, and trichloroethylene. These results are scientifically valid — but they were obtained in airtight chambers of 3.5 m³. In a real interior with ventilation, the effect is present but requires several plants to be significant.
Recent research (2019–2025): confirmation and nuances
Studies conducted by American and European universities confirm and detail these benefits:
- Absorption of certain VOCs (formaldehyde, benzene, xylene)
- Increase in relative humidity by 5–10%
- Measurable reduction of CO2 in enclosed spaces
- Improvement of well-being and concentration
- Leaves absorb gaseous VOCs through stomata
- The substrate and its microorganisms actively contribute to depollution
- The cumulative effect of several plants exceeds the individual sum
- CAM plants work both day and night
The 5 most effective plants according to science
| Plant | Targeted pollutants | Effectiveness | Care |
|---|---|---|---|
| 🌸 Spathiphyllum (Peace lily) | Ammonia, benzene, formaldehyde | ⭐⭐⭐ High | Easy |
| 🕷️ Chlorophytum (Spider plant) | Formaldehyde, xylene | ⭐⭐⭐ High | Very easy |
| 🍃 Pothos (Scindapsus) | Benzene, formaldehyde | ⭐⭐½ Medium to high | Very easy |
| 🌿 Sansevieria (Mother-in-law's tongue) | Benzene, trichloroethylene + night O₂ | ⭐⭐½ Average + night | Very easy |
| 🌱 Dracaena marginata | Trichloroethylene, xylene | ⭐⭐½ Medium to high | Easy |
🛒 All these plants in our collection
Find these 5 species in our Purifying Plants collection, selected for their effectiveness and ease of care.
How many plants to improve air quality?
💡 The urban jungle effect
The more plants you have, the greater the cumulative effect. 10 to 15 plants in a 50 m² apartment create a true microclimate: regulated humidity, reduced CO2, significant VOC absorption. This is when the benefits become truly noticeable daily.
Plants vs air purifier: complementary approaches
Plants and purifiers do not act on the same pollutants — they complement rather than replace each other.
- Absorb gaseous VOCs (formaldehyde, benzene, xylene)
- Regulate humidity naturally (+5–10%)
- Reduce CO2, produce oxygen
- Improve well-being and reduce stress (proven)
- Create a living and calming environment
- Zero electricity consumption, zero filters to change
- Filter fine particles (PM2.5, dust, pollen)
- Quick action on allergens and solid particles
- Effective against outdoor pollution entering indoors
- Require electricity and regular filter replacement
🔗 The ideal approach
For optimal indoor air: plants (gas + humidity) + daily ventilation 10 min morning and evening + purifier if allergies or heavy urban pollution.
How to maximize the purifying effect
1. Strategic placement
- Near pollution sources: new furniture, printer, cleaning products
- In the rooms where you spend the most time: bedroom, office, living room
- Distribute plants across several rooms rather than concentrating them all in one place
- Avoid direct drafts that reduce efficiency
2. Optimal maintenance
- Dust blocks stomata
- 20–30% loss of efficiency without maintenance
- Damp cloth every 15 days
- Especially important for large leaves
- Slightly moist soil = active microorganisms
- Repot regularly for fresh and more effective substrate
- Prune to thicken foliage (more exchange surface)
- Watering adapted to the season
3. Effective combinations by room
- Sansevieria — nocturnal O₂
- Spathiphyllum — large foliage, VOC
- Chlorophytum — humidity + formaldehyde
- Pothos — VOCs, easy care
- Dracaena — height, xylene
- Sansevieria — hardy, versatile
- 4–6 plants of varied sizes
- Cover all levels (floor, furniture, hanging)
- Mix species with large and small leaves
Common misconceptions to consider
Why invest in purifying plants?
Beyond purification, the real and measurable benefits of houseplants are numerous:
- Well-being and focus: 15–20% stress reduction, improved concentration — proven by scientific studies
- Humidity regulation: +5–10% relative humidity, beneficial for skin and respiratory tracts, especially in winter
- Measurable CO2 reduction in enclosed spaces like offices or bedrooms
- VOC absorption: real effect on formaldehyde, benzene, xylene from new furniture and cleaning products
- Connection to nature: biophilia, calming effect, improved overall atmosphere
- Natural and sustainable solution: zero electricity use, no filters to replace
🛒 Start with the right plants
Our Air-purifying Plants collection features the most effective species according to science, selected for their ease of care. Perfect for starting or enhancing your urban jungle.
FAQ — Plants and air quality
The Spathiphyllum (Peace Lily) is particularly effective: it absorbs ammonia, benzene, and formaldehyde, while increasing humidity. For the bedroom, pair it with a Sansevieria that produces oxygen at night — a rare trait among houseplants.
For measurable benefits, count on 8 to 12 medium-sized plants spread throughout the rooms. The cumulative effect on humidity (+5–10%), CO2, and VOCs becomes significant from this threshold. The more you have, the greater the effect.
Some plants can trigger reactions: Ficus (latex), fragrant flowering plants, or mold in overly wet soil. If you are sensitive, prefer Sansevieria, Pothos, or Dracaena, and avoid overwatering.
Yes, it’s essential. Dust blocks stomata (leaf pores) and reduces pollutant absorption by 20 to 30%. Clean leaves with a damp cloth every two weeks to maintain full effectiveness.
No. Only living plants absorb VOCs through their metabolism and soil microorganisms. Artificial plants have absolutely no effect on indoor air quality.
In a well-ventilated room, no. In small poorly ventilated spaces, too many plants can push humidity above 70% and encourage mold. The recommended limit is one plant per 2 m² maximum.
Most plants slow down their activity at night because photosynthesis stops without light. Exception: CAM plants (Sansevieria, Aloe vera, cactus) continue to absorb CO2 and produce oxygen 24/7 — perfect for the bedroom.
Chlorophytum (Spider Plant) and Pothos are the top performers against formaldehyde according to studies. Spathiphyllum ranks third. Place them near sources: new furniture, cleaning products, textiles.
In summary: real benefits, provided you do it right
Indoor plants are much more than decoration. They regulate humidity, absorb VOCs, reduce CO2, and — scientifically proven — improve your well-being and concentration. The key is to choose the right species, place them strategically, and care for them properly.
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📚 To learn more
🌿 Start with 2–3 plants, and gradually increase to create your urban jungle.
