Here is what the page “Do Houseplants Really Freshen Indoor Air? An Imperial College Scientist Weighs In” contains. The Guardian Lifestyle Oct 5, 2026 • 7:00 AM 1 views Many people believe that filling a room with houseplants can significantly improve air quality by boosting oxygen and filtering pollutants. But John Tregoning, a professor at Imperial College London and author of Live Forever? A Curious Scientist’s Guide to Wellness, Ageing and Death, explains that while plants do release oxygen during photosynthesis, the effect in a typical home or office is negligible.
To meaningfully increase oxygen levels, you would need an impractical number of plants—likely a dense indoor jungle. The idea of plants as natural air purifiers is appealing, especially for stuffy, poorly ventilated spaces, but the science doesn’t support it. Tregoning notes that the air exchange in most buildings far outweighs any contribution from a few potted plants. The full version stays on the original page, which this listing opens directly.