Key points from article :
12 published studies were reviewed, and 196 experimental results were translated into clean air delivery rates.
140 m2 house or office needs 680 house plants to achieve the same airflow as a couple of open windows.
Rate at which plants cleaned volatile organic compounds from the air was so slow as to be irrelevant.
In a building with an extremely low airflow 1 potted plant per sq m might achieve 20% effectiveness.
Finding out how plants filter indoor VOCs could potentially be useful for 'biopurifiers'.
