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In this presentation it is investigated how different transient test cycles are reflected by the particulate emissions of heavy duty engines and what the influence on number size distribution of emitted particles is. The emissions of particulate matter of five different in-use engines of heavy-duty trucks (EURO II) were evaluated. The total particle number was measured using the Condensation Particle Counter CPC, and number size distribution was measured using the Electrical Low Pressure Impactor ELPI. In addition, the mass of emitted particles was determined by a standard gravimetric measurement system. The used test cycles either represent the real-world driving behaviour on the road (real-world test cycles) or a type approval procedure. Total particle number and time resolved particle emissions measured by different methods are presented. The differences between the test cycles, as well as the behaviour in the individual parts of the cycles (the urban, the rural and the highway part) are shown. It is concluded that, generally, a reduction of particulate mass is correlated with a reduction of particulate number. The test cycle has almost no influence on the correlation between particulate mass and number. The correlation between particulate mass and number is more influenced by the measured engine. The Number Size Distribution is almost not influenced by different transient cycles.