This Recommendation presents the necessary conditions for implementing near-real-time greenhouse gas monitoring in cities, with updates provided shortly after data collection rather than instantly (real-time) [b-Zhu2022], to support the sustainable development strategy and planning of the city. Compared to existing research or standards, near-real-time greenhouse gas data in cities can present high temporal resolution characteristics of urban emissions (hourly or daily), enabling better identification of spatial and temporal hotspots. This can help city managers formulate more effective emission reduction policies. Recommendation ITU-T L.1640 presents the general principles on data collection, data processing, data fusion, and monitoring and analyzing GHG emissions of cities and outlines the different methodologies that are being developed: – Sources for near-real-time city data collection, and its processing and fusing. – Key steps for city near-real-time GHG calculation and attribution analysis. – Optimization strategy for city sustainable planning.

The summary was revised as shown in the AR text.