Intervention
Indoor plants (phytoremediation)
Also: phytoremediation, houseplants
Houseplants can absorb volatile organic compounds in sealed laboratory chambers, but in real rooms the effect on air quality is negligible — hundreds of plants per room would be needed to match ordinary ventilation.
Why it matters indoors
The idea comes from NASA chamber experiments of the 1980s. Later work translating chamber removal rates to real rooms found that one would need roughly 10 to 1000 plants per square metre to equal the clean-air delivery of a modest ventilation rate. Plants are good for wellbeing and humidity, but they are not an air-cleaning measure; presenting them as one is a common marketing claim the evidence does not support.
What the studies report
12 of 24 Findings — those with the strongest study design.
| Linked to | Effect | Population | Study design | Source | Checked |
|---|---|---|---|---|---|
| Total volatile organic compounds (TVOC) | difference 87.5 | — · university laboratory | experiment with four ornamental potted plants as a plant-based biofilter: benzene, toluene, benzaldehyde and acetophenone in an incubation chamber and then indoor air quality parameters measured in a pharmaceutical laboratory with and without the plants, over standardised 40-minute sessions | F-1046 Comparative evaluation of air phytoremediation potential of … (2025) | machine |
| Carbon dioxide (CO₂) | difference 88.23 | — · university laboratory | experiment with four ornamental potted plants as a plant-based biofilter: benzene, toluene, benzaldehyde and acetophenone in an incubation chamber and then indoor air quality parameters measured in a pharmaceutical laboratory with and without the plants, over standardised 40-minute sessions | F-1047 Comparative evaluation of air phytoremediation potential of … (2025) | machine |
| Carbon monoxide (CO) | difference 36.78 | — · university laboratory | experiment with four ornamental potted plants as a plant-based biofilter: benzene, toluene, benzaldehyde and acetophenone in an incubation chamber and then indoor air quality parameters measured in a pharmaceutical laboratory with and without the plants, over standardised 40-minute sessions | F-1048 Comparative evaluation of air phytoremediation potential of … (2025) | machine |
| Particulate matter (PM₂.₅ and PM₁₀) | difference 100 | — · university laboratory | experiment with four ornamental potted plants as a plant-based biofilter: benzene, toluene, benzaldehyde and acetophenone in an incubation chamber and then indoor air quality parameters measured in a pharmaceutical laboratory with and without the plants, over standardised 40-minute sessions | F-1049 Comparative evaluation of air phytoremediation potential of … (2025) | machine |
| Particulate matter (PM₂.₅ and PM₁₀) | difference 100 | — · university laboratory | experiment with four ornamental potted plants as a plant-based biofilter: benzene, toluene, benzaldehyde and acetophenone in an incubation chamber and then indoor air quality parameters measured in a pharmaceutical laboratory with and without the plants, over standardised 40-minute sessions | F-1050 Comparative evaluation of air phytoremediation potential of … (2025) | machine |
| Volatile organic compounds (VOCs) | a single plant species in one laboratory room, measured over 40 minutes | — · university laboratory | experiment with four ornamental potted plants as a plant-based biofilter: benzene, toluene, benzaldehyde and acetophenone in an incubation chamber and then indoor air quality parameters measured in a pharmaceutical laboratory with and without the plants, over standardised 40-minute sessions | F-1051 Comparative evaluation of air phytoremediation potential of … (2025) | machine |
| Benzene | mean 0.3 | — · university laboratory | study of plant-based biofiltration in a pharmaceutical teaching laboratory: benzene and toluene removal by ornamental species measured against the laboratory background, with a health risk assessment for staff and students | F-1116 Sustainable indoor air quality via plant-based biofiltration… (2026) | machine |
| Toluene (C₇H₈) | mean 4 | — · university laboratory | study of plant-based biofiltration in a pharmaceutical teaching laboratory: benzene and toluene removal by ornamental species measured against the laboratory background, with a health risk assessment for staff and students | F-1117 Sustainable indoor air quality via plant-based biofiltration… (2026) | machine |
| Formaldehyde (CH₂O) | the study says formaldehyde fell with passing time regardless of the plants, so the change cannot be read as an effect of the plants | asthmatics and their households · home | quasi-experimental study in the homes of asthmatics in Korea over two observation terms: households of continuation kept the indoor plants for both terms, households of withdrawal kept them for the first term and passed the second without any plants; formaldehyde and benzene, toluene, ethylbenzene and xylene were measured indoors, with peak expiratory flow rate twice a day and an asthma-specific quality of life questionnaire, compared with the Mann-Whitney test | F-1220 House-plant placement for indoor air purification and health… (2014) | machine |
| Formaldehyde (CH₂O) | the study says formaldehyde fell with passing time regardless of the plants, so the change cannot be read as an effect of the plants | asthmatics and their households · home | quasi-experimental study in the homes of asthmatics in Korea over two observation terms: households of continuation kept the indoor plants for both terms, households of withdrawal kept them for the first term and passed the second without any plants; formaldehyde and benzene, toluene, ethylbenzene and xylene were measured indoors, with peak expiratory flow rate twice a day and an asthma-specific quality of life questionnaire, compared with the Mann-Whitney test | F-1221 House-plant placement for indoor air purification and health… (2014) | machine |
| Formaldehyde (CH₂O) | a stated direction without a number; the sibling rows carry the concentrations of both groups | asthmatics and their households · home | quasi-experimental study in the homes of asthmatics in Korea over two observation terms: households of continuation kept the indoor plants for both terms, households of withdrawal kept them for the first term and passed the second without any plants; formaldehyde and benzene, toluene, ethylbenzene and xylene were measured indoors, with peak expiratory flow rate twice a day and an asthma-specific quality of life questionnaire, compared with the Mann-Whitney test | F-1222 House-plant placement for indoor air purification and health… (2014) | machine |
| Formaldehyde (CH₂O) | the sentence is the study's statement that the plants made no difference to formaldehyde; the direction of the difference it reports for the other compounds is not stated in the sentence, so a sibling row from the abstract carries it | asthmatics and their households · home | quasi-experimental study in the homes of asthmatics in Korea over two observation terms: households of continuation kept the indoor plants for both terms, households of withdrawal kept them for the first term and passed the second without any plants; formaldehyde and benzene, toluene, ethylbenzene and xylene were measured indoors, with peak expiratory flow rate twice a day and an asthma-specific quality of life questionnaire, compared with the Mann-Whitney test | F-1223 House-plant placement for indoor air purification and health… (2014) | machine |
Each row is one Finding — a sentence as printed in one study, recorded with its page in the Coridum Knowledge Base. Follow the Finding number for the exact wording and the citation. Checked says who verified the row: machine means every automatic check passed and the surrounding text was read; person means someone read the sentence in the document. Rows are re-checked by a person over time. The studies are curated in the Coridum Knowledge Base; the reading of them together is a Claim, shown separately.
In the literature
- Ravindra et al. Phytoremediation potential of indoor plants in reducing air pollutants (2022). Frontiers in Sustainable Cities. doi:10.3389/frsc.2022.1039710 CKB 0814
- Environmental modulation enhances benzene phytoremediation by Aglaonema and Dracaena in indoor settings (2025). Sci Rep. doi:10.1038/s41598-025-15722-1 CKB 1168
- Integrating multivariate analysis and Air Pollution Tolerance Index (APTI) to evaluate… (2026). Sci Rep. doi:10.1038/s41598-026-50763-0 CKB 1110
Studies in the Coridum Knowledge Base in which this term is used. The definition follows standard usage in WHO, ISO and textbook sources; it is not quoted from these papers.
CKB = document number in the Coridum Knowledge Base, our curated library of peer-reviewed studies. Follow the DOI for the original paper.
Cite this page
Coridum Research. Indoor plants (phytoremediation). Coridum Knowledge G-0071, 16 September 2026. https://coridum.com/k/G-0071/