An indication that the NASA study suggesting houseplants clean room air contains misconceptions

A 1989 NASA study helped fuel the idea that houseplants can clean indoor air, but experts say that result came from a sealed lab setting.

In real homes, ventilation, changing pollutant levels, and normal room conditions greatly reduce any air-cleaning effect from plants alone.

Researchers from Drexel and the University of Limerick say houseplants may still help with mood and well-being, but they are not a substitute for real air-quality solutions.

For better indoor air, experts recommend practical measures such as ventilation and HEPA air purifiers rather than relying on plants.