The aim of this data-file is to compile CO2 concentrations in industrial exhaust streams, as a molar percentage of flue gas. This matters for the costs of CO2 separation (e.g., the amine process).
Costs will generally be c10-15% lower to separate out CO2 in middling processes such as blast furnaces and cement plants, compared to lower concentration processes such as coal and combined cycle gas plants.
Costs of separating CO2 from ambient air will be an order of magnitude higher again (at least c4-6x, as costs rise linearly as concentrations fall by each order of magnitude).
Most promisingly, some CO2 is already purely concentrated (e.g., after pre-treating natural gas before LNG liquefaction; or after separating out industrial hydrogen from SMR in the refining, ammonia, chemicals and blue hydrogen industries). These be the most promising options for CCS.