HELCOM
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The Baltic Sea - an introduction
State of the Baltic Sea Environment
Indicators 2004
Hydrography and Oxygen in the Deep Basins
Water exchange and conditions in deep basins
Temporal trend in Baltic Sea Runoff
Water transparency
Development of Sea surface temperature in the Baltic Sea
Spatial Distribution of the Winter Nutrient Pool
Chlorophyll-a concentrations
Spring bloom estimates
Phytoplankton biomass and species succession
Cyanobacterial blooms in the Baltic Sea
Cyanobacteria bloom index
Atmospheric emissions of heavy metals in the Baltic Sea region
Atmospheric depositions of heavy metals over the Baltic Sea
Heavy metals in water
Temporal Trends in Contaminants in Herring
Lead concentrations in fish liver
PCB concentrations in fish muscle
Caesium-137 in Baltic Sea sediments
Cs-137 concentrations in fish and surface waters
Illegal discharges of oil
Indicators 2003
Indicators 2002
Ecosystem Approach
The Baltic Sea of Surprises
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Helsinki Commission Environment Pollution Man and the Baltic HELCOM Atlas

Figure 4
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Figure 4. Extent of hypoxic and anoxic bottom water (oxygen content below 2 ml/l and 0 ml respectively) in Autumn 2000 - 2003.