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Time alignment of concentration and volume flow signals could be neglected for surveying engines in stationary operating modes, which have been widely used for the determination and optimization of engines maps. With RDE requirements, the dynamic operation of the engines in the engine test cell and the determination of pollutants at tailpipe with PEMS systems have grown in importance. Therefore, a more precise computation of the emitted pollutant and CO2 mass is needed in order to satisfy the demand for dynamic measurements, both in the engine test cell as on the road. The presentation addresses the physical principle of the calculation of the pollutant mass values, the inclusion of the static time delay of the analysers into the computation, and a method for their respective determination on the engine test rig. Additionally, the influence of the sampling point for concentration signals in the exhaust system on the signal shape is touched and compared to the signal shape of the volume flow signal. Furthermore, an analysis of the influence of misalignment of the concentration and flow signals is given and the signal shape is compared to a pollutant mass signal derived from a CVS, which by definition does not need a time alignment and therefore can be regarded as reference for this discussion.