Associated risks and monitoring
Carbon Dioxide Capture and Geologic Storage (CCS)

CO₂ occurs naturally in the atmosphere. Its volume content in homes and workplaces generally varies from 0.04 to 0.06%. Occupational exposure limit values are 5,000 ppm by volume (0.5%) at 8 h per day and 40 h per week .

Existing geological reservoirs have demonstrated their ability to hold gas and oil for millions of years. It is not uncommon for these reservoirs to contain CO₂ . Natural CO₂ deposits exist (example of Montmiral in the Drôme). This shows that underground reservoirs can be watertight over long periods. Underground storage has already been applied on a large scale to methane storage, without any major accidents having been reported.