The study region, the Venosta Valley, is located in the west of South Tyrol, the largest contiguous apple-growing region in Europe. South Tyrolean apples are known for their perfect appearance, which often goes hand in hand with the use of large quantities of pesticides during production. A new study by the RPTU University of Kaiserslautern-Landau and the University of Natural Resources and Life Sciences, Vienna (BOKU) shows that these pesticides do not remain on the cultivation area, but can be detected throughout the valley and up to high altitudes. The pesticide mixtures detected can have harmful effects on the environment.