Data on CO₂ degassing help understanding the relations of the gas flow on geodynamic processes. Long-term gas flow measurements in rough field conditions present a challenge due to technical problems. We describe methods used for CO₂ flow monitoring in West-Bohemia/Vogtland, which is typical for high CO₂ flow, and present a new robust method based on pressure measurements in a water column. The results of 10 years of CO₂ flow measurements and their relation to seismic activity are discussed.