Exhaust Gas (or Flue Gas) Posted on 10th November 201527th July 2021 by ThePD (The Project Definition) Exhaust Gas (or Flue Gas) is emitted as a result of the combustion of fuels in combustion engines that is harmful to human beings, plants and animals. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Substance and tagged gas. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.