The accurate monitoring of greenhouse gas (GHG) emissions, particularly carbon dioxide (CO2), is essential in the global effort to address climate change. My internship focused on the development of tools and methodologies to enhance ground-based observations, particularly using the EM27/SUN Fourier Transform Spectrometer, within the framework of CNES’s satellite validation missions. The primary objective was the creation of the "PROFFAST dashboard", a tool designed for real-time data treatment and visualization during GHG measurement campaigns. This dashboard enables immediate analysis and dynamic adjustment of field operations, improving data collection efficiency. Additionally, the thesis involved participating in a summer observation campaign, which aimed to validate the performance of multiple EM27/SUN spectrometers and to check the validity of models of CO2 distribution.