In order to measure concentrations of heavy metals in moss, several nationwide surveys have been carried out since 1977. The last survey was carried out in 2005. The surveys show that chromium deposition levels are now generally low throughout Norway. The only exception is the area around the ferro-chromium plant in Mo i Rana.
Concentrations of chromium
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.