The decline of insects threatens many ecosystems worldwide. While the effects of pesticides are well researched, there has been a lack of knowledge about the effects of other anthropogenic pollutants. Animal ecologists at the University of Bayreuth have now studied the effects of diesel exhaust particles on bumblebees for the first time. In two new studies, they show that these fine dust particles can significantly damage the organism of bumblebees if they are permanently ingested through food. The Bavarian State Ministry for the Environment and Consumer Protection funded the research work as part of the BayÖkotox project network.