MetroPOEM – Tracing Pollution

The aim of MetroPOEM was to enhance the traceability, sensitivity, and comparability of pollutant measurements—especially for ultra-low concentrations and isotope ratios of radioactive and stable elements. To improve traceability, the project explored ways to harmonise measurement methods for radioactive and non-radioactive substances.

The MetroPOEM project lasted three years and brought together 24 research institutes and universities from 14 different countries. From Finland, the Radiation and Nuclear Safety Authority (STUK) and the University of Helsinki participated in the project.

Traditionally, radioactive substances are identified by measuring the radiation they emit, while non-radioactive substances are typically analysed using mass spectrometry. MetroPOEM sought to bridge the gap between radiometric techniques and mass spectrometry in the characterisation and detection of long-lived radionuclides and stable elements. Comparing and combining these techniques has significantly improved measurement uncertainties and detection limits.

Sinikka Virtanen, Head of Laboratory at STUK, states that the project has achieved its ambitious goals, and the results will significantly improve the comparability, reliability, and traceability of environmental pollutant measurements—enabling more effective monitoring and decision-making.

Another key objective of MetroPOEM was to provide harmonised and clear guidance for measurements, including Good Practice Guides and training videos. According to Sinikka Virtanen, the guidance is now complete, and all the project results will be efficiently made available to laboratories through project websites.

The MetroPOEM project was driven by the European Union’s Green Deal’s zero pollution ambition, which aims for a pollution-free and non-toxic environment.