How HELCOM’s new strategic approach is reshaping the regional response to hazardous substances in the Baltic Sea.

Laying the groundwork: strategic review for change
By the end of 2010s, HELCOM’s work on hazardous substances was still focused on a relatively limited number of substances. Actions and HELCOM Recommendations were often developed on an ad hoc basis and were not systematically linked to regularly updated assessments of the marine environment or pollutant loads. The regional context had also changed significantly since the Helsinki Convention was negotiated: by 2004, eight of nine HELCOM Contracting Parties were also EU member states, and chemicals regulation had become largely harmonized at the EU level.
Work began in spring 2020 on a comprehensive review of the HELCOM framework on hazardous substances. The review was carried out in cooperation with the Baltic Sea Centre of Stockholm University and supported by the Swedish Agency for Marine and Water Management, with all HELCOM Contracting Parties actively participating.
In 2021, a background report on an update of HELCOM work on hazardous substances in the Baltic Sea was published. The review concluded that while an existing HELCOM Recommendation had set out general principles for work on hazardous substances, there was no systematic mechanism for regularly updating the list of priority substances. Such a mechanism was needed to ensure that decisions were based on the latest data on inputs, environmental status and emerging substances of concern. HELCOM’s role in relation to other regional and EU-level policies also needed to be clarified, with a focus on identifying the specific added value of HELCOM’s activities.
These findings informed the 2021 update of the HELCOM Baltic Sea Action Plan (BSAP), through which the HELCOM Contracting Parties committed to several key actions. These included developing a regional strategic approach for managing hazardous substances, establishing a mechanism for managing the HELCOM list of priority substances, setting up procedures to use and build on data from other policy frameworks as well as updating the priority substances list and developing a regional action plan.
From strategic review to strategic approach
The development work began in October 2022. It was supported by two dedicated projects, HAPHazard and HAZ-SHAP, which ensured sufficient resources for the work. Clear requirements were defined for the new framework:
- It should promote a truly holistic assessment of hazardous substances, covering a broad range of chemicals
- It should link actions to the outcomes of the assessment, ensuring that measures target the most relevant substances and issues, including data and knowledge gaps
- It should actively interact with existing policies, both by utilizing data generated by them and by influencing their further development, ensuring that HELCOM actions provide added value to – and function in synergy with – existing policies.
To inform the design, paradigms and mechanisms used under other policies or organizations, as well as examples from scientific literature, were reviewed to identify relevant elements for the regional marine framework. These insights, combined with creative development work, helped to define a high-level conceptual structure for the framework.
A series of informal consultation sessions of HELCOM’s Expert Group on Hazardous substances (EG Haz) and several ad hoc meetings helped to refine the concept into a fully functional mechanism. This was a systematic and iterative process, where national experts contributed knowledge, feedback and suggestions on optimizing the various parts of the framework’s mechanism. Throughout the whole process, the HELCOM Working Group on Source to Sea Management of Nutrients and Hazardous Substances and Sustainable Agricultural Practices (WG Source to Sea) provided overarching strategic guidance. By the end of 2023, a draft but operational version of the regional strategic approach was ready for testing – or rather its ‘primary run’. The finalized regional strategic approach consists of four main steps:
- Holistic assessment of the state of the environment (levels of chemicals and observed biological effects), human activities and pressures (e.g. inputs to the Baltic Sea via different pathways).
- Identification of substances or groups of substances of possible concern for the Baltic Sea, based on established criteria.
- Updating of three priority lists (substances, sources of release, uncertainties to address).
- Use of these lists as complementary perspectives to inspire adoption of measures of added value, following an analysis of the effectiveness and gaps in existing measures.
The approach was designed to be both flexible and systematic and to account for differences in the availability of data and resources as well as policy priorities. It ensures that each piece of information contributes clearly to understanding of the overall picture. The systematic structuring of available information also facilitates the identification of knowledge gaps in data or methodologies, helps express uncertainties and allows for easy integration of new scientific developments and data. Special attention was given in balancing the need for evidence with the precautionary principle.
The framework operates in recurring six-year cycles, designed to align with and draw data from other HELCOM processes ( HOLAS , PLC ) or regulatory frameworks (MSFD, WFD, REACH, etc.). In turn, the framework can support these processes by providing a basis for proposing new indicators and strengthening coordination of monitoring programmes, programmes of measures and regulatory actions.
Testing the approach: Short and long-term impacts
The year 2024 marked the first full application of the new approach. Key data sources were identified and used to support a holistic assessment that ultimately covered around 1,500 substances and substance groups. In parallel, several projects provided deeper insight into specific parts of the assessments, including biological effects, pharmaceuticals, PFAS substances and on non-target and suspect screening.
The careful design of the framework, its principles, definitions and mechanisms proved effective. It not only improved the efficiency of the process but also helped regional discussions focus on the specific characteristics of substances and the selection of appropriate policy options.
The work led to direct results, such as three agreed priority lists and 55 fact sheets, providing overviews for each highlighted substance or substance group, a tested regional strategic approach as well as a regional action plan on hazardous substances in preparation, outlining HELCOM’s role in relation to other policy frameworks.
One key realization from this process was that although one of the priority lists (‘Horizontal uncertainties to address’) still contained a number of priority needs, overall the gaps had been significantly reduced compared to the situation before the primary run.
There were also valuable indirect outputs. New databases were established for the Baltic Sea and its catchment area, compiling information on marine concentrations and estimated inputs for numerous substances and groups, based on data from national and international databases, screening campaigns, scientific articles and reports and using automated tools.
Ther long-term impacts of this work are expected to include new HELCOM indicators based on newly listed HELCOM priority substances, support to EU-level processes such as the Water Framework Directive (WFD) and the Marine Strategy Framework Directive (MSFD) as well as stronger, better coordinated regional work. The three priority lists convey a clear message to authorities and stakeholders, helping them focus on mitigating the highest risks and on addressing key knowledge gaps or methodological gaps.
Looking ahead: Building synergies and shared tools
Throughout the development and implementation, collaboration with other Regional Sea Conventions and organisations brought mutual benefits through shared expertise. These exchanges laid the foundation for future cooperation and joint initiatives. A great example is the Harmonised Regional Seas Assessment Tool (HARSAT) tool, a collaboration between the Baltic, North-east Atlantic and Arctic Regional Seas Conventions, supported by ICES, consultants and members of the relevant expert groups. This openly available tool improves the efficiency of statistical analysis of contaminant data in marine samples, enhancing indicator evaluations for hazardous substances across regions.
Written by Vasileios Kouloumpos, Project Researcher, HELCOM
This article was first published by UNEP in their StoryMap Regional Seas: Transforming Oceans, Empowering People




