The surface water nutrient concentrations were normal or lower than normal in most areas, with the exception of the phosphate and silicate in the Baltic Proper. Phosphate levels were above normal throughout the Baltic Proper. Silicate levels were above normal only in the southern Baltic Proper. Oxygen concentrations below 2 ml/l were found in the Baltic Proper at depths exceeding 70 to 90 metres. Hydrogen sulphide was found at depths greater than 90 to 100 metres, at the Gotland Deep and the Landsort Deep from 150 metres and deeper.