A new online resource compiling data reported by HELCOM countries on input of nutrients to the Baltic Sea has recently been made available to the public. Hosted by the Baltic Nest Institute, the HELCOM PLC-Water database is now open to all and offers annual data on nutrient loads collected by HELCOM pollution load compilations (PLC) since 1995.

Recent HELCOM assessments show that land-based pollution remains the major environmental pressure on the Baltic Sea marine ecosystem. Land-based sources are responsible for the large share of total discharges into the sea both nutrients and hazardous substances.

Pollution load compilations (PLC) are carried out by all HELCOM countries to evaluate and quantify the amount of pollutants annually discharged from land into the sea. The data is obtained from national monitoring programmes and reporting from industries and municipal water works.

Data on airborne deposition of nitrogen and selected hazardous substances specifically provided by  the European Monitoring and Evaluation Programme (EMEP) for the HELCOM area are published as Baltic Sea Environmental Fact Sheets (BSEFs).

Another important HELCOM work to help visualizing data on environmental pressures in the Baltic Sea region is the HELCOM Map and Data service (MADS). A new section is now specifically dedicated to land-based sources of sea pollution.

It contains several interactive maps illustrating major direct pollution sources as well as distribution of diffuse loads in the Baltic Sea catchment area. It also maps information on transboundary rivers, location of monitoring stations and others.