A study reveals indoor air contains far more tiny plastic particles than previously known, with vehicles having over four times more than homes.
Indoor plastic particles exceed previous estimates
A study by researchers at the University of Toulouse, published in PLOS One in July 2025, revealed that indoor air contains far more microscopic plastic particles than previously believed. These particles are often small enough to be inhaled deep into the lungs.Plastic concentration varies by location
The study found a median concentration of 528 plastic particles per cubic meter of air in homes, while inside cars, the number rose to 2,238 particles—over four times higher. This difference is partly due to the confined space of vehicles, higher temperatures, and the abundance of plastic materials in cars.Sources of the plastic particles
The tiny plastic fragments primarily come from the wear of synthetic textiles, packaging materials, and interior coverings. These particles become airborne through daily activities and movements, spreading throughout the environment.Advanced technique detects smaller particles
The researchers used Raman spectroscopy, a method that analyzes how light scatters off materials, to detect particles as small as one micrometer. This technique surpasses previous methods, which could only detect particles down to ten micrometers in size.
