The net land-atmosphere exchange of carbon monoxide remains highly uncertain due to the scarcity of long-term monitoring. This study analyses a 10-year-long data series from a tall-tower eddy covariance system. The flux footprint of this system covers a heterogeneous landscape. Vegetation-dominated areas acted as a weak net source. Solar radiation was identified as the primary driver of the emissions. Emissions from the populated areas significantly exceeded the activity-based estimations.