In order to determine site-specific criteria, it will be necessary to know local baseline conditions, such as groundwater chemistry, ecosystem composition, average wind speed and direction, topography, sensitivity of ecosystems in the area and population. For CO2Carbon dioxide concentrations in air, it may be possible to use generic standards, such as existing regulations for work environment conditions in which the effects of exposure to elevated CO2Carbon dioxide concentrations on humans are wellManmade hole drilled into the earth to produce liquids or gases, or to allow the injection of fluids documented. Another issue when establishing environmental criteria is the assessment of consequences the criteria should be based upon. Environmental quality standards (EQS) are set as the total maximum concentration/dose from different sources to an ecosystem. The authorities are responsible for setting requirements, environmental criteria and limit values. Since CCSCarbon dioxide Capture and Storage is a new concept, input from industry and other stakeholders will be important for the development and determination of acceptable levels and limits that can be used when performing a riskConcept that denotes the product of the probability of a hazard and the subsequent consequence of the associated event analysis and assessing potential consequences of leakage(in CO2 storage) The escape of injected fluid from the storage formation to the atmosphere or water column. It is desirable that there is a consensus in the development of environmental criteria in the field of CCSCarbon dioxide Capture and Storage.