This is the dataset used for "Global distribution of carbon monoxide in the Martian atmosphere derived from the ExoMars-TGO/NOMAD measurement and interpretation with the GEM-Mars model." The dataset contains the retrieved CO VMR, number density, and slant column density. The CO2 density in the dataset is coming from the GEM-Mars simulation. The dataset consist of "Altitude[km], CO VMR[ppm], CO VMR error[ppm], CO number density[/cm^3], CO number density error[/cm^3], CO slant column density[/cm^2], CO2 number density[/cm^3], Ls[deg], Latitude[deg], East longitude[deg], LST[hour],"