Metrology for climate action

To accurately understand climate and environmental changes, it's crucial to have precise and reliable measurements, especially in a complex system that includes various physical and chemical parameters. Germany's national metrology institute, the Physikalisch-Technische Bundesanstalt (PTB), has taken initiatives to align its metrology efforts with climate action and environmental protection. The so founded Innovation Cluster Environment & Climate (IC-U) has implemented strategic actions to tackle the metrological challenges related to climate change and environmental threats. From air quality to z-score evaluation, PTB is serving metrology research needs and customer demands with respect to climate and environment topics. This contribution showcases examples spanning from optical gas standards (OGS) for air quality networks, neutron scattering-based soil moisture measurements and radon metrology applied to greenhouse gas transportation, to quantum chemistry applications for remote sensing with uncertainty figures as small as 0.14 %.