The Copernicus anthropogenic carbon dioxide monitoring mission (CO2M) will measure atmospheric carbon dioxide produced by human activity. The mission will reduce the current uncertainties in estimates of emissions of carbon dioxide at national and regional scales, helping Europe to track the national emission reduction targets. The primary spectrometer is the near infrared and shortwave infrared spectrometer. A multiangle polarimeter (MAP) acting as an auxiliary instrument measures the aerosols providing the light path correction to reduce the uncertainties in the CO2 measurements. SRON's SPEX instrument funded by the Dutch Government, based on the SPEXone instrument for PACE, will be an additional MAP on the mission to act as a risk reduction strategy and provide cross-verification for the primary MAP. SRON works with Airbus Defense and Space in an integrated team to develop and build this instrument.