In order to measure concentrations of heavy metals in moss, several nationwide surveys have been carried out since 1977. The last survey in 2005 showed little change in concentrations since 2000. Industrial plants on the Kola Peninsula are still the dominant source of copper deposition. More surveys conducted in recent years indicate that the deposition of certain metals, primarily nickel and copper, has increased.
Concentrations of copper
micrograms per gram moss
Source: Climate and Pollution Agency. The map is an animation that shows the reduction in acidification in Norway. If you cannot see the animation, you may need to change the settings of your web browser. In Internet Explorer, choose Tools -> Internet options -> Advanced, and tick the check box “Play animations in web pages”.