This background paper explores the potential for APEC economies to implement innovative technologies to aid the measurement of atmospheric greenhouse gas (GHG) emissions and the associated protocols for their adoption. It provides an overview of the current suite of atmospheric measurement systems and devices, emerging technologies in the field, and key examples of what APEC economies are currently using to measure atmospheric GHG emissions. Additionally, this paper dives into the importance of aligning technologies with regulatory frameworks of emissions inventories to support the adoption and integration of effective measurement and monitoring practices.