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The article presents some problems experienced while operating combustion engines used in the mining industry. The regulations apply to engines working in underground workings and they include: emission limits of individual toxic substances in exhaust gases, issues related to the ignition and explosive protection, and limitations associated with the maximum temperature of the external surfaces of the drive unit and the emitted gases. The article shows currently used solutions of the exhaust systems, and the authors own concept of the exhaust syste outlet system that meets legal requirements. The presented concept concerns a reduction of emissions of toxic substances exhaust gases and a new solution of the maximum temperature limit.