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The exergy and entropy changes of the surroundings adjacent to exhaust-gas emitting ports, and the probable effects on the atmosphere, are investigated and the current stable state changing point of atmosphere is determined and compared in the paper. The potential of doing work is described and the effects of the amount of exhaust gas on the atmosphere are studied through exergy and entropy change functions. The exergy change function accounts for the flow direction of the exhaust gas without local wind. It appears that exergy can be used as a state function to describe the change, the stability and the order of a system.