This report describes the in-situ atmospheric measurements already being performed in Europe that are relevant for the determination of anthropogenic fluxes. These measurements include atmospheric volume mixing ratios of carbon dioxide (CO2), carbon monoxide (CO), the ratio of radiocarbon in carbon dioxide (∆14CO2), and atmospheric potential oxygen (APO). Routine measurements made from ground-based remote sensing are included in this analysis, following the Copernicus definition of in situ to include everything except for satellite measurements. An attempt is made to summarize the location and frequency of these measurements, as well as their uncertainties. Additionally, the currently available urban flux tower measurements of CO2 fluxes in Europe are described, as these measurements may provide relevant observational constraints on the diurnal, weekly, and annual fluctuations in anthropogenic emissions.