Lake Halmsjön, which drains large areas of Arlanda airport, exhibits PFOS levels that are seriously elevated in both surface water and fish. Although some dilution occurs at the lake´s outflow into the Märsta river, the levels measured where the flow enters the Mälaren river are also higher than the background levels measure further downstream.
The levels of PFOS in both surface water and aquatic life in Lilla Issjö lake and the Issjö river near Landvetter airport are very elevated. The levels are diluted in Västra Ingsjö lake and decrease as the outflow moves seaward through the Kungsbacka river, falling to background levels where it enters the sea.
PFOS is a highly biodegradable-resistant and bioaccumulative substance that is used in a variety of products. Although no longer manufactured in Europe or the USA, it was formerly used, for example, in impregnating agents, hydraulic systems and firefighting products.
The test programme forms part of the RE-PATH research project, whose purpose is to study and map the occurrence and dispersion of PFOS at Arlanda and Landvetter, including the risks it presents to humans and the environment, and to examine possible remedial measures.
The project is led by IVL Swedish Environmental Research Institute, and funded by airport authority Swedavia and the Swedish Environmental Protection Agency. In addition, representatives from bodies including the Swedish Chemicals Agency, Swedish Society for Nature Conservation (SSNC) and the respective county councils form a reference group associated with the programme.
For further information, please contact Karin Norström, tel. +46-8-598 564, 20 or Tomas Viktor, tel. +46-8-598 563 73.