Lake Geneva microplastic pollution found to be 650 times higher than estimated

A study conducted by scientists from the University of Lausanne (UNIL) and EPFL has revealed that microplastic pollution in Lake Geneva is significantly higher than previously estimated. By utilizing a new analytical method capable of detecting much smaller particles than traditional techniques, researchers found that plastic pollution levels could be up to 656 times higher than prior assessments.

The study indicates that the smallest plastic fragments represent up to 97% of the total plastic pollution measured in the lake. These tiny particles, often smaller than 20 microns, have previously remained largely invisible to standard monitoring methods. Because these particles are small enough to interact with living organisms, ecotoxicological tests conducted during the research suggest that current concentrations may reach levels capable of causing concerning effects on aquatic life.

Researchers emphasize that while larger microplastics (over 100 microns) are relatively easy to detect, they represent only a small fraction of the total environmental presence. The findings raise questions regarding the adequacy of current indicators and measurement techniques used by authorities to monitor the water quality of lakes and rivers.