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The number of hydrogen refuelling stations in the European Union (EU) will increase significantly over the coming years, as stipulated in the EU Regulation 2023/1804 on the deployment of alternative fuels infrastructure. The hydrogen refuelling infrastructure is maturing rapidly: achieving higher flow rates for fast heavy-duty refuelling, tapping into new hydrogen sources to guarantee sufficient supply, and reducing downtime to cope with the increasing demand. To support these developments, this project aims to develop metrology infrastructure and provide new measurement standards, methods, and best practices for measurement of both hydrogen quality and quantity.