A review of scientific evidence examines claims that houseplants can purify indoor air. The sources note that many popular explanations are based on laboratory studies or small-scale experiments that do not always translate to real homes with typical plant numbers, lighting, and ventilation. While plants can remove certain gases under specific conditions and through processes involving leaves and associated microbial activity in potting media, the effects measured in controlled settings are often small compared with the air-cleaning performance of purpose-built filtration systems.
The articles also highlight that air-quality testing can vary widely depending on the pollutants measured, the timeframe of exposure, and how the experiments account for other factors such as air exchange and soil chemistry. As a result, the overall conclusion is not a simple yes-or-no: plants may contribute marginally to certain aspects of indoor air chemistry in some circumstances, but they are not a reliable substitute for ventilation, air filtration, or other established interventions—especially for removing higher concentrations of common indoor pollutants.
Overall, the scientific case suggests modest, context-dependent benefits rather than strong, consistent air-purifying performance in everyday home conditions.
