At visited stations in Kattegatt, Skagerrak and the Sound nutrient concentrations showed normal or near normal values for the season. The phosphorus concentration was still elevated in the southern Baltic Proper. Silicate and inorganic nitrogen compounds were normal throughout the investigation area. Oxygen values below 2 ml/l were found at all stations in western, eastern and northern Baltic Proper with bottom depth greater than 70 to 80 metres. Hydrogen sulphide was found from 70 to 80 metres and deeper in southern Baltic Proper, from 130 to 150 metres and deeper in eastern Baltic Proper and finally from 70 to 90 metres and deeper in northern Baltic Proper.