Absolutely right. Many carbon capture systems that are installed on top of smokestacks have much higher concentrations of CO2 than the air does (~300x higher concentrations in smokestacks). Henry's Law states that as partial pressure of a gas goes up, its solubility in a given liquid also goes up [1]. So, if you have a smokestack with a higher concentration of CO2 available than what you can get in air, it's going to be easier to capture the same amount of CO2 bc more CO2 will want to dissolve in the liquid that it's dissolving in.

There are some cool ways that people are working on to concentrate CO2 using membranes, metal organic frameworks, and other things - we'd love to someday incorporate something like this at the front end of our process!