The gateway to Europe's
integrated metrology community.

Stable isotope metrology to enable climate action and regulation

Short Name: STELLAR, Project Number: 19ENV05
Image showing smoking chimneys
Smoking chimneys

New reference materials to help fingerprint the source of greenhouse gas emissions

Carbon dioxide (CO2) and methane (CH4) released into the atmosphere by human activity are major contributors to the presence of greenhouse gases (GHGs), driving climate change. Field-deployable spectroscopes can help identify sources and discriminate between human and natural emissions for these by analysing the ratios of CO2 and CH4 isotopes present. However, these instruments require calibration with gases with measurement traceability and precisely known isotope compositions which are currently lacking, compromising the comparability of global observations.


The project has provided improved CO2, and the first ever, CH4 reference materials linked to the SI through international isotope ratio scales. Validation routines and traceability chains for spectroscopic techniques have also been developed to allow state-of-the-art measurements to be made in the field. At the end of the project in 2023 the improved discrimination between natural and manmade sources of GHGs will aid governmental agencies to better attribute emission sources, help demonstrate compliance to national reduction targets and enhance the effectiveness of future abatement strategies.


This project builds on from EMPIR project 16ENV06 SIRS  and EMPIR project 21GRD04 isoMET builds on this work.


Project website
Other Participants
Al Air Liquide España, S.A. (Spain)
Eidgenoessische Materialpruefungs- und Forschungsanstalt (Switzerland)
Institut Jožef Stefan (Slovenia)
Itä-Suomen yliopisto (Finland)
Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V. (Germany)
Rijksuniversiteit Groningen (Netherlands)